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diff --git a/docs/sqlglot/transforms.html b/docs/sqlglot/transforms.html index b3cb63e..9694adf 100644 --- a/docs/sqlglot/transforms.html +++ b/docs/sqlglot/transforms.html @@ -3,7 +3,7 @@ <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> - <meta name="generator" content="pdoc 13.1.0"/> + <meta name="generator" content="pdoc 13.1.1"/> <title>sqlglot.transforms API documentation</title> <style>/*! * Bootstrap Reboot v5.0.0 (https://getbootstrap.com/) * Copyright 2011-2021 The Bootstrap Authors * Copyright 2011-2021 Twitter, Inc. * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE) * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md) */*,::after,::before{box-sizing:border-box}@media (prefers-reduced-motion:no-preference){:root{scroll-behavior:smooth}}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","Liberation Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;background-color:#fff;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}hr{margin:1rem 0;color:inherit;background-color:currentColor;border:0;opacity:.25}hr:not([size]){height:1px}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:500;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}@media (min-width:1200px){h1{font-size:2.5rem}}h2{font-size:calc(1.325rem + .9vw)}@media (min-width:1200px){h2{font-size:2rem}}h3{font-size:calc(1.3rem + .6vw)}@media (min-width:1200px){h3{font-size:1.75rem}}h4{font-size:calc(1.275rem + .3vw)}@media (min-width:1200px){h4{font-size:1.5rem}}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-top:0;margin-bottom:1rem}abbr[data-bs-original-title],abbr[title]{-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}ol,ul{padding-left:2rem}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:.875em}mark{padding:.2em;background-color:#fcf8e3}sub,sup{position:relative;font-size:.75em;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#0d6efd;text-decoration:underline}a:hover{color:#0a58ca}a:not([href]):not([class]),a:not([href]):not([class]):hover{color:inherit;text-decoration:none}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em;direction:ltr;unicode-bidi:bidi-override}pre{display:block;margin-top:0;margin-bottom:1rem;overflow:auto;font-size:.875em}pre code{font-size:inherit;color:inherit;word-break:normal}code{font-size:.875em;color:#d63384;word-wrap:break-word}a>code{color:inherit}kbd{padding:.2rem .4rem;font-size:.875em;color:#fff;background-color:#212529;border-radius:.2rem}kbd kbd{padding:0;font-size:1em;font-weight:700}figure{margin:0 0 1rem}img,svg{vertical-align:middle}table{caption-side:bottom;border-collapse:collapse}caption{padding-top:.5rem;padding-bottom:.5rem;color:#6c757d;text-align:left}th{text-align:inherit;text-align:-webkit-match-parent}tbody,td,tfoot,th,thead,tr{border-color:inherit;border-style:solid;border-width:0}label{display:inline-block}button{border-radius:0}button:focus:not(:focus-visible){outline:0}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,select{text-transform:none}[role=button]{cursor:pointer}select{word-wrap:normal}select:disabled{opacity:1}[list]::-webkit-calendar-picker-indicator{display:none}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}::-moz-focus-inner{padding:0;border-style:none}textarea{resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{float:left;width:100%;padding:0;margin-bottom:.5rem;font-size:calc(1.275rem + .3vw);line-height:inherit}@media (min-width:1200px){legend{font-size:1.5rem}}legend+*{clear:left}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-fields-wrapper,::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute,::-webkit-datetime-edit-month-field,::-webkit-datetime-edit-text,::-webkit-datetime-edit-year-field{padding:0}::-webkit-inner-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:textfield}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-color-swatch-wrapper{padding:0}::file-selector-button{font:inherit}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}iframe{border:0}summary{display:list-item;cursor:pointer}progress{vertical-align:baseline}[hidden]{display:none!important}</style> @@ -43,10 +43,16 @@ <a class="function" href="#remove_precision_parameterized_types">remove_precision_parameterized_types</a> </li> <li> - <a class="function" href="#preprocess">preprocess</a> + <a class="function" href="#unnest_to_explode">unnest_to_explode</a> + </li> + <li> + <a class="function" href="#explode_to_unnest">explode_to_unnest</a> + </li> + <li> + <a class="function" href="#remove_target_from_merge">remove_target_from_merge</a> </li> <li> - <a class="function" href="#delegate">delegate</a> + <a class="function" href="#preprocess">preprocess</a> </li> </ul> @@ -176,79 +182,172 @@ </span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Window</span><span class="p">):</span> </span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">,</span> <span class="s2">"_w"</span><span class="p">)</span> </span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">alias</span><span class="p">),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="n">expr</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">alias</span><span class="p">))</span> -</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a> <span class="k">elif</span> <span class="n">expr</span><span class="o">.</span><span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">:</span> -</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a> -</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="k">return</span> <span class="n">outer_selects</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">(</span><span class="n">alias</span><span class="o">=</span><span class="s2">"_t"</span><span class="p">))</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">qualify_filters</span><span class="p">)</span> -</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a> -</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-106"><a href="#L-106"><span class="linenos">106</span></a> <span class="n">column</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span> +</span><span id="L-107"><a href="#L-107"><span class="linenos">107</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Qualify</span><span class="p">):</span> +</span><span id="L-108"><a href="#L-108"><span class="linenos">108</span></a> <span class="n">qualify_filters</span> <span class="o">=</span> <span class="n">column</span> +</span><span id="L-109"><a href="#L-109"><span class="linenos">109</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="L-110"><a href="#L-110"><span class="linenos">110</span></a> <span class="n">expr</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">column</span><span class="p">)</span> +</span><span id="L-111"><a href="#L-111"><span class="linenos">111</span></a> <span class="k">elif</span> <span class="n">expr</span><span class="o">.</span><span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">:</span> +</span><span id="L-112"><a href="#L-112"><span class="linenos">112</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> </span><span id="L-113"><a href="#L-113"><span class="linenos">113</span></a> -</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> -</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a><span class="k">def</span> <span class="nf">remove_precision_parameterized_types</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> -</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a><span class="sd"> Some dialects only allow the precision for parameterized types to be defined in the DDL and not in</span> -</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a><span class="sd"> other expressions. This transforms removes the precision from parameterized types in expressions.</span> -</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a><span class="sd"> """</span> -</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a> <span class="k">return</span> <span class="n">expression</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span> -</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a> <span class="k">lambda</span> <span class="n">node</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">(</span> -</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a> <span class="o">**</span><span class="p">{</span> -</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a> <span class="o">**</span><span class="n">node</span><span class="o">.</span><span class="n">args</span><span class="p">,</span> -</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a> <span class="s2">"expressions"</span><span class="p">:</span> <span class="p">[</span> -</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="n">node_expression</span> -</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="k">for</span> <span class="n">node_expression</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">expressions</span> -</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node_expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> -</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="p">],</span> -</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="p">}</span> -</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="p">)</span> -</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> -</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="k">else</span> <span class="n">node</span><span class="p">,</span> -</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a> <span class="p">)</span> -</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> -</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> -</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> -</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> -</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a> <span class="n">to_sql</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">],</span> -</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> -</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> -</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a><span class="sd"> expression to SQL, using an appropriate `Generator.TRANSFORMS` function.</span> -</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a> -</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a><span class="sd"> Args:</span> -</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> -</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a><span class="sd"> to_sql: final transform that converts the resulting expression to a SQL string.</span> -</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> -</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a><span class="sd"> Returns:</span> -</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a><span class="sd"> Function that can be used as a generator transform.</span> -</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a><span class="sd"> """</span> +</span><span id="L-114"><a href="#L-114"><span class="linenos">114</span></a> <span class="k">return</span> <span class="n">outer_selects</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">(</span><span class="n">alias</span><span class="o">=</span><span class="s2">"_t"</span><span class="p">))</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">qualify_filters</span><span class="p">)</span> +</span><span id="L-115"><a href="#L-115"><span class="linenos">115</span></a> +</span><span id="L-116"><a href="#L-116"><span class="linenos">116</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-117"><a href="#L-117"><span class="linenos">117</span></a> +</span><span id="L-118"><a href="#L-118"><span class="linenos">118</span></a> +</span><span id="L-119"><a href="#L-119"><span class="linenos">119</span></a><span class="k">def</span> <span class="nf">remove_precision_parameterized_types</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="L-120"><a href="#L-120"><span class="linenos">120</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-121"><a href="#L-121"><span class="linenos">121</span></a><span class="sd"> Some dialects only allow the precision for parameterized types to be defined in the DDL and not in</span> +</span><span id="L-122"><a href="#L-122"><span class="linenos">122</span></a><span class="sd"> other expressions. This transforms removes the precision from parameterized types in expressions.</span> +</span><span id="L-123"><a href="#L-123"><span class="linenos">123</span></a><span class="sd"> """</span> +</span><span id="L-124"><a href="#L-124"><span class="linenos">124</span></a> <span class="k">return</span> <span class="n">expression</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span> +</span><span id="L-125"><a href="#L-125"><span class="linenos">125</span></a> <span class="k">lambda</span> <span class="n">node</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">(</span> +</span><span id="L-126"><a href="#L-126"><span class="linenos">126</span></a> <span class="o">**</span><span class="p">{</span> +</span><span id="L-127"><a href="#L-127"><span class="linenos">127</span></a> <span class="o">**</span><span class="n">node</span><span class="o">.</span><span class="n">args</span><span class="p">,</span> +</span><span id="L-128"><a href="#L-128"><span class="linenos">128</span></a> <span class="s2">"expressions"</span><span class="p">:</span> <span class="p">[</span> +</span><span id="L-129"><a href="#L-129"><span class="linenos">129</span></a> <span class="n">node_expression</span> +</span><span id="L-130"><a href="#L-130"><span class="linenos">130</span></a> <span class="k">for</span> <span class="n">node_expression</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">expressions</span> +</span><span id="L-131"><a href="#L-131"><span class="linenos">131</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node_expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> +</span><span id="L-132"><a href="#L-132"><span class="linenos">132</span></a> <span class="p">],</span> +</span><span id="L-133"><a href="#L-133"><span class="linenos">133</span></a> <span class="p">}</span> +</span><span id="L-134"><a href="#L-134"><span class="linenos">134</span></a> <span class="p">)</span> +</span><span id="L-135"><a href="#L-135"><span class="linenos">135</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> +</span><span id="L-136"><a href="#L-136"><span class="linenos">136</span></a> <span class="k">else</span> <span class="n">node</span><span class="p">,</span> +</span><span id="L-137"><a href="#L-137"><span class="linenos">137</span></a> <span class="p">)</span> +</span><span id="L-138"><a href="#L-138"><span class="linenos">138</span></a> +</span><span id="L-139"><a href="#L-139"><span class="linenos">139</span></a> +</span><span id="L-140"><a href="#L-140"><span class="linenos">140</span></a><span class="k">def</span> <span class="nf">unnest_to_explode</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="L-141"><a href="#L-141"><span class="linenos">141</span></a><span class="w"> </span><span class="sd">"""Convert cross join unnest into lateral view explode (used in presto -> hive)."""</span> +</span><span id="L-142"><a href="#L-142"><span class="linenos">142</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> +</span><span id="L-143"><a href="#L-143"><span class="linenos">143</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]:</span> +</span><span id="L-144"><a href="#L-144"><span class="linenos">144</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span> +</span><span id="L-145"><a href="#L-145"><span class="linenos">145</span></a> +</span><span id="L-146"><a href="#L-146"><span class="linenos">146</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">):</span> +</span><span id="L-147"><a href="#L-147"><span class="linenos">147</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">unnest</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">)</span> +</span><span id="L-148"><a href="#L-148"><span class="linenos">148</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span> <span class="k">if</span> <span class="n">unnest</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"ordinality"</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Explode</span> +</span><span id="L-149"><a href="#L-149"><span class="linenos">149</span></a> +</span><span id="L-150"><a href="#L-150"><span class="linenos">150</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"joins"</span><span class="p">]</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">join</span><span class="p">)</span> </span><span id="L-151"><a href="#L-151"><span class="linenos">151</span></a> -</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">):</span> -</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> -</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> -</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="k">return</span> <span class="n">to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span> -</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> -</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="k">return</span> <span class="n">_to_sql</span> -</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> -</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a> -</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a><span class="k">def</span> <span class="nf">delegate</span><span class="p">(</span><span class="n">attr</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">:</span> -</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a><span class="sd"> Create a new method that delegates to `attr`. This is useful for creating `Generator.TRANSFORMS`</span> -</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a><span class="sd"> functions that delegate to existing generator methods.</span> -</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a><span class="sd"> """</span> -</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> -</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="k">def</span> <span class="nf">_transform</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> -</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a> <span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">attr</span><span class="p">)(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> -</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> -</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="k">return</span> <span class="n">_transform</span> +</span><span id="L-152"><a href="#L-152"><span class="linenos">152</span></a> <span class="k">for</span> <span class="n">e</span><span class="p">,</span> <span class="n">column</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">unnest</span><span class="o">.</span><span class="n">expressions</span><span class="p">,</span> <span class="n">alias</span><span class="o">.</span><span class="n">columns</span> <span class="k">if</span> <span class="n">alias</span> <span class="k">else</span> <span class="p">[]):</span> +</span><span id="L-153"><a href="#L-153"><span class="linenos">153</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> +</span><span id="L-154"><a href="#L-154"><span class="linenos">154</span></a> <span class="s2">"laterals"</span><span class="p">,</span> +</span><span id="L-155"><a href="#L-155"><span class="linenos">155</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Lateral</span><span class="p">(</span> +</span><span id="L-156"><a href="#L-156"><span class="linenos">156</span></a> <span class="n">this</span><span class="o">=</span><span class="n">udtf</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">e</span><span class="p">),</span> +</span><span id="L-157"><a href="#L-157"><span class="linenos">157</span></a> <span class="n">view</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> +</span><span id="L-158"><a href="#L-158"><span class="linenos">158</span></a> <span class="n">alias</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">alias</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">columns</span><span class="o">=</span><span class="p">[</span><span class="n">column</span><span class="p">]),</span> <span class="c1"># type: ignore</span> +</span><span id="L-159"><a href="#L-159"><span class="linenos">159</span></a> <span class="p">),</span> +</span><span id="L-160"><a href="#L-160"><span class="linenos">160</span></a> <span class="p">)</span> +</span><span id="L-161"><a href="#L-161"><span class="linenos">161</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-162"><a href="#L-162"><span class="linenos">162</span></a> +</span><span id="L-163"><a href="#L-163"><span class="linenos">163</span></a> +</span><span id="L-164"><a href="#L-164"><span class="linenos">164</span></a><span class="k">def</span> <span class="nf">explode_to_unnest</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="L-165"><a href="#L-165"><span class="linenos">165</span></a><span class="w"> </span><span class="sd">"""Convert explode/posexplode into unnest (used in hive -> presto)."""</span> +</span><span id="L-166"><a href="#L-166"><span class="linenos">166</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> +</span><span id="L-167"><a href="#L-167"><span class="linenos">167</span></a> <span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">build_scope</span> +</span><span id="L-168"><a href="#L-168"><span class="linenos">168</span></a> +</span><span id="L-169"><a href="#L-169"><span class="linenos">169</span></a> <span class="n">taken_select_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span> +</span><span id="L-170"><a href="#L-170"><span class="linenos">170</span></a> <span class="n">taken_source_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">build_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span> </span><span id="L-171"><a href="#L-171"><span class="linenos">171</span></a> -</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> -</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a><span class="n">UNALIAS_GROUP</span> <span class="o">=</span> <span class="p">{</span><span class="n">exp</span><span class="o">.</span><span class="n">Group</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">unalias_group</span><span class="p">],</span> <span class="n">delegate</span><span class="p">(</span><span class="s2">"group_sql"</span><span class="p">))}</span> -</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a><span class="n">ELIMINATE_DISTINCT_ON</span> <span class="o">=</span> <span class="p">{</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">eliminate_distinct_on</span><span class="p">],</span> <span class="n">delegate</span><span class="p">(</span><span class="s2">"select_sql"</span><span class="p">))}</span> -</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a><span class="n">ELIMINATE_QUALIFY</span> <span class="o">=</span> <span class="p">{</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">eliminate_qualify</span><span class="p">],</span> <span class="n">delegate</span><span class="p">(</span><span class="s2">"select_sql"</span><span class="p">))}</span> -</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a><span class="n">REMOVE_PRECISION_PARAMETERIZED_TYPES</span> <span class="o">=</span> <span class="p">{</span> -</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Cast</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">remove_precision_parameterized_types</span><span class="p">],</span> <span class="n">delegate</span><span class="p">(</span><span class="s2">"cast_sql"</span><span class="p">))</span> -</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a><span class="p">}</span> +</span><span id="L-172"><a href="#L-172"><span class="linenos">172</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span> +</span><span id="L-173"><a href="#L-173"><span class="linenos">173</span></a> <span class="n">to_replace</span> <span class="o">=</span> <span class="n">select</span> +</span><span id="L-174"><a href="#L-174"><span class="linenos">174</span></a> +</span><span id="L-175"><a href="#L-175"><span class="linenos">175</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="s2">""</span> +</span><span id="L-176"><a href="#L-176"><span class="linenos">176</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="s2">""</span> +</span><span id="L-177"><a href="#L-177"><span class="linenos">177</span></a> +</span><span id="L-178"><a href="#L-178"><span class="linenos">178</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">):</span> +</span><span id="L-179"><a href="#L-179"><span class="linenos">179</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">alias</span> +</span><span id="L-180"><a href="#L-180"><span class="linenos">180</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span> +</span><span id="L-181"><a href="#L-181"><span class="linenos">181</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Aliases</span><span class="p">):</span> +</span><span id="L-182"><a href="#L-182"><span class="linenos">182</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> +</span><span id="L-183"><a href="#L-183"><span class="linenos">183</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> +</span><span id="L-184"><a href="#L-184"><span class="linenos">184</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span> +</span><span id="L-185"><a href="#L-185"><span class="linenos">185</span></a> +</span><span id="L-186"><a href="#L-186"><span class="linenos">186</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Explode</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)):</span> +</span><span id="L-187"><a href="#L-187"><span class="linenos">187</span></a> <span class="n">is_posexplode</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)</span> +</span><span id="L-188"><a href="#L-188"><span class="linenos">188</span></a> +</span><span id="L-189"><a href="#L-189"><span class="linenos">189</span></a> <span class="n">explode_arg</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span> +</span><span id="L-190"><a href="#L-190"><span class="linenos">190</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="p">[</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">copy</span><span class="p">()],</span> <span class="n">ordinality</span><span class="o">=</span><span class="n">is_posexplode</span><span class="p">)</span> +</span><span id="L-191"><a href="#L-191"><span class="linenos">191</span></a> +</span><span id="L-192"><a href="#L-192"><span class="linenos">192</span></a> <span class="c1"># This ensures that we won't use [POS]EXPLODE's argument as a new selection</span> +</span><span id="L-193"><a href="#L-193"><span class="linenos">193</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">explode_arg</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span> +</span><span id="L-194"><a href="#L-194"><span class="linenos">194</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">output_name</span><span class="p">)</span> +</span><span id="L-195"><a href="#L-195"><span class="linenos">195</span></a> +</span><span id="L-196"><a href="#L-196"><span class="linenos">196</span></a> <span class="n">unnest_source_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_source_names</span><span class="p">,</span> <span class="s2">"_u"</span><span class="p">)</span> +</span><span id="L-197"><a href="#L-197"><span class="linenos">197</span></a> <span class="n">taken_source_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">unnest_source_alias</span><span class="p">)</span> +</span><span id="L-198"><a href="#L-198"><span class="linenos">198</span></a> +</span><span id="L-199"><a href="#L-199"><span class="linenos">199</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">explode_alias</span><span class="p">:</span> +</span><span id="L-200"><a href="#L-200"><span class="linenos">200</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"col"</span><span class="p">)</span> +</span><span id="L-201"><a href="#L-201"><span class="linenos">201</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">)</span> +</span><span id="L-202"><a href="#L-202"><span class="linenos">202</span></a> +</span><span id="L-203"><a href="#L-203"><span class="linenos">203</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span> +</span><span id="L-204"><a href="#L-204"><span class="linenos">204</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"pos"</span><span class="p">)</span> +</span><span id="L-205"><a href="#L-205"><span class="linenos">205</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">)</span> +</span><span id="L-206"><a href="#L-206"><span class="linenos">206</span></a> +</span><span id="L-207"><a href="#L-207"><span class="linenos">207</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span> +</span><span id="L-208"><a href="#L-208"><span class="linenos">208</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">,</span> <span class="n">pos_alias</span><span class="p">]</span> +</span><span id="L-209"><a href="#L-209"><span class="linenos">209</span></a> <span class="n">to_replace</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span> +</span><span id="L-210"><a href="#L-210"><span class="linenos">210</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">,</span> <span class="n">explode_alias</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="L-211"><a href="#L-211"><span class="linenos">211</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="L-212"><a href="#L-212"><span class="linenos">212</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">]</span> +</span><span id="L-213"><a href="#L-213"><span class="linenos">213</span></a> <span class="n">to_replace</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">))</span> +</span><span id="L-214"><a href="#L-214"><span class="linenos">214</span></a> +</span><span id="L-215"><a href="#L-215"><span class="linenos">215</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">unnest_source_alias</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">column_names</span><span class="p">)</span> +</span><span id="L-216"><a href="#L-216"><span class="linenos">216</span></a> +</span><span id="L-217"><a href="#L-217"><span class="linenos">217</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">):</span> +</span><span id="L-218"><a href="#L-218"><span class="linenos">218</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="L-219"><a href="#L-219"><span class="linenos">219</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="L-220"><a href="#L-220"><span class="linenos">220</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">join_type</span><span class="o">=</span><span class="s2">"CROSS"</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="L-221"><a href="#L-221"><span class="linenos">221</span></a> +</span><span id="L-222"><a href="#L-222"><span class="linenos">222</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-223"><a href="#L-223"><span class="linenos">223</span></a> +</span><span id="L-224"><a href="#L-224"><span class="linenos">224</span></a> +</span><span id="L-225"><a href="#L-225"><span class="linenos">225</span></a><span class="k">def</span> <span class="nf">remove_target_from_merge</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="L-226"><a href="#L-226"><span class="linenos">226</span></a><span class="w"> </span><span class="sd">"""Remove table refs from columns in when statements."""</span> +</span><span id="L-227"><a href="#L-227"><span class="linenos">227</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Merge</span><span class="p">):</span> +</span><span id="L-228"><a href="#L-228"><span class="linenos">228</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">)</span> +</span><span id="L-229"><a href="#L-229"><span class="linenos">229</span></a> <span class="n">targets</span> <span class="o">=</span> <span class="p">{</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">this</span><span class="p">}</span> +</span><span id="L-230"><a href="#L-230"><span class="linenos">230</span></a> <span class="k">if</span> <span class="n">alias</span><span class="p">:</span> +</span><span id="L-231"><a href="#L-231"><span class="linenos">231</span></a> <span class="n">targets</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">alias</span><span class="o">.</span><span class="n">this</span><span class="p">)</span> +</span><span id="L-232"><a href="#L-232"><span class="linenos">232</span></a> +</span><span id="L-233"><a href="#L-233"><span class="linenos">233</span></a> <span class="k">for</span> <span class="n">when</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span> +</span><span id="L-234"><a href="#L-234"><span class="linenos">234</span></a> <span class="n">when</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span> +</span><span id="L-235"><a href="#L-235"><span class="linenos">235</span></a> <span class="k">lambda</span> <span class="n">node</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">name</span><span class="p">)</span> +</span><span id="L-236"><a href="#L-236"><span class="linenos">236</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"table"</span><span class="p">)</span> <span class="ow">in</span> <span class="n">targets</span> +</span><span id="L-237"><a href="#L-237"><span class="linenos">237</span></a> <span class="k">else</span> <span class="n">node</span><span class="p">,</span> +</span><span id="L-238"><a href="#L-238"><span class="linenos">238</span></a> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> +</span><span id="L-239"><a href="#L-239"><span class="linenos">239</span></a> <span class="p">)</span> +</span><span id="L-240"><a href="#L-240"><span class="linenos">240</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="L-241"><a href="#L-241"><span class="linenos">241</span></a> +</span><span id="L-242"><a href="#L-242"><span class="linenos">242</span></a> +</span><span id="L-243"><a href="#L-243"><span class="linenos">243</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> +</span><span id="L-244"><a href="#L-244"><span class="linenos">244</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> +</span><span id="L-245"><a href="#L-245"><span class="linenos">245</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> +</span><span id="L-246"><a href="#L-246"><span class="linenos">246</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-247"><a href="#L-247"><span class="linenos">247</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> +</span><span id="L-248"><a href="#L-248"><span class="linenos">248</span></a><span class="sd"> expression to SQL, using an appropriate `Generator.TRANSFORMS` function.</span> +</span><span id="L-249"><a href="#L-249"><span class="linenos">249</span></a> +</span><span id="L-250"><a href="#L-250"><span class="linenos">250</span></a><span class="sd"> Args:</span> +</span><span id="L-251"><a href="#L-251"><span class="linenos">251</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> +</span><span id="L-252"><a href="#L-252"><span class="linenos">252</span></a> +</span><span id="L-253"><a href="#L-253"><span class="linenos">253</span></a><span class="sd"> Returns:</span> +</span><span id="L-254"><a href="#L-254"><span class="linenos">254</span></a><span class="sd"> Function that can be used as a generator transform.</span> +</span><span id="L-255"><a href="#L-255"><span class="linenos">255</span></a><span class="sd"> """</span> +</span><span id="L-256"><a href="#L-256"><span class="linenos">256</span></a> +</span><span id="L-257"><a href="#L-257"><span class="linenos">257</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> +</span><span id="L-258"><a href="#L-258"><span class="linenos">258</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> +</span><span id="L-259"><a href="#L-259"><span class="linenos">259</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> +</span><span id="L-260"><a href="#L-260"><span class="linenos">260</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-261"><a href="#L-261"><span class="linenos">261</span></a> <span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">)(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="L-262"><a href="#L-262"><span class="linenos">262</span></a> +</span><span id="L-263"><a href="#L-263"><span class="linenos">263</span></a> <span class="k">return</span> <span class="n">_to_sql</span> +</span><span id="L-264"><a href="#L-264"><span class="linenos">264</span></a> +</span><span id="L-265"><a href="#L-265"><span class="linenos">265</span></a> +</span><span id="L-266"><a href="#L-266"><span class="linenos">266</span></a><span class="n">UNALIAS_GROUP</span> <span class="o">=</span> <span class="p">{</span><span class="n">exp</span><span class="o">.</span><span class="n">Group</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">unalias_group</span><span class="p">])}</span> +</span><span id="L-267"><a href="#L-267"><span class="linenos">267</span></a><span class="n">ELIMINATE_DISTINCT_ON</span> <span class="o">=</span> <span class="p">{</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">eliminate_distinct_on</span><span class="p">])}</span> +</span><span id="L-268"><a href="#L-268"><span class="linenos">268</span></a><span class="n">ELIMINATE_QUALIFY</span> <span class="o">=</span> <span class="p">{</span><span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">eliminate_qualify</span><span class="p">])}</span> +</span><span id="L-269"><a href="#L-269"><span class="linenos">269</span></a><span class="n">REMOVE_PRECISION_PARAMETERIZED_TYPES</span> <span class="o">=</span> <span class="p">{</span> +</span><span id="L-270"><a href="#L-270"><span class="linenos">270</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Cast</span><span class="p">:</span> <span class="n">preprocess</span><span class="p">([</span><span class="n">remove_precision_parameterized_types</span><span class="p">])</span> +</span><span id="L-271"><a href="#L-271"><span class="linenos">271</span></a><span class="p">}</span> </span></pre></div> @@ -429,13 +528,17 @@ </span><span id="eliminate_qualify-104"><a href="#eliminate_qualify-104"><span class="linenos">104</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Window</span><span class="p">):</span> </span><span id="eliminate_qualify-105"><a href="#eliminate_qualify-105"><span class="linenos">105</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">,</span> <span class="s2">"_w"</span><span class="p">)</span> </span><span id="eliminate_qualify-106"><a href="#eliminate_qualify-106"><span class="linenos">106</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">alias</span><span class="p">),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="eliminate_qualify-107"><a href="#eliminate_qualify-107"><span class="linenos">107</span></a> <span class="n">expr</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">alias</span><span class="p">))</span> -</span><span id="eliminate_qualify-108"><a href="#eliminate_qualify-108"><span class="linenos">108</span></a> <span class="k">elif</span> <span class="n">expr</span><span class="o">.</span><span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">:</span> -</span><span id="eliminate_qualify-109"><a href="#eliminate_qualify-109"><span class="linenos">109</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> -</span><span id="eliminate_qualify-110"><a href="#eliminate_qualify-110"><span class="linenos">110</span></a> -</span><span id="eliminate_qualify-111"><a href="#eliminate_qualify-111"><span class="linenos">111</span></a> <span class="k">return</span> <span class="n">outer_selects</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">(</span><span class="n">alias</span><span class="o">=</span><span class="s2">"_t"</span><span class="p">))</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">qualify_filters</span><span class="p">)</span> -</span><span id="eliminate_qualify-112"><a href="#eliminate_qualify-112"><span class="linenos">112</span></a> -</span><span id="eliminate_qualify-113"><a href="#eliminate_qualify-113"><span class="linenos">113</span></a> <span class="k">return</span> <span class="n">expression</span> +</span><span id="eliminate_qualify-107"><a href="#eliminate_qualify-107"><span class="linenos">107</span></a> <span class="n">column</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">alias</span><span class="p">)</span> +</span><span id="eliminate_qualify-108"><a href="#eliminate_qualify-108"><span class="linenos">108</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">parent</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Qualify</span><span class="p">):</span> +</span><span id="eliminate_qualify-109"><a href="#eliminate_qualify-109"><span class="linenos">109</span></a> <span class="n">qualify_filters</span> <span class="o">=</span> <span class="n">column</span> +</span><span id="eliminate_qualify-110"><a href="#eliminate_qualify-110"><span class="linenos">110</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="eliminate_qualify-111"><a href="#eliminate_qualify-111"><span class="linenos">111</span></a> <span class="n">expr</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">column</span><span class="p">)</span> +</span><span id="eliminate_qualify-112"><a href="#eliminate_qualify-112"><span class="linenos">112</span></a> <span class="k">elif</span> <span class="n">expr</span><span class="o">.</span><span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">:</span> +</span><span id="eliminate_qualify-113"><a href="#eliminate_qualify-113"><span class="linenos">113</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">expr</span><span class="o">.</span><span class="n">copy</span><span class="p">(),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="eliminate_qualify-114"><a href="#eliminate_qualify-114"><span class="linenos">114</span></a> +</span><span id="eliminate_qualify-115"><a href="#eliminate_qualify-115"><span class="linenos">115</span></a> <span class="k">return</span> <span class="n">outer_selects</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">subquery</span><span class="p">(</span><span class="n">alias</span><span class="o">=</span><span class="s2">"_t"</span><span class="p">))</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="n">qualify_filters</span><span class="p">)</span> +</span><span id="eliminate_qualify-116"><a href="#eliminate_qualify-116"><span class="linenos">116</span></a> +</span><span id="eliminate_qualify-117"><a href="#eliminate_qualify-117"><span class="linenos">117</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -463,25 +566,25 @@ otherwise we won't be able to refer to it in the outer query's WHERE clause.</p> </div> <a class="headerlink" href="#remove_precision_parameterized_types"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="remove_precision_parameterized_types-116"><a href="#remove_precision_parameterized_types-116"><span class="linenos">116</span></a><span class="k">def</span> <span class="nf">remove_precision_parameterized_types</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> -</span><span id="remove_precision_parameterized_types-117"><a href="#remove_precision_parameterized_types-117"><span class="linenos">117</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="remove_precision_parameterized_types-118"><a href="#remove_precision_parameterized_types-118"><span class="linenos">118</span></a><span class="sd"> Some dialects only allow the precision for parameterized types to be defined in the DDL and not in</span> -</span><span id="remove_precision_parameterized_types-119"><a href="#remove_precision_parameterized_types-119"><span class="linenos">119</span></a><span class="sd"> other expressions. This transforms removes the precision from parameterized types in expressions.</span> -</span><span id="remove_precision_parameterized_types-120"><a href="#remove_precision_parameterized_types-120"><span class="linenos">120</span></a><span class="sd"> """</span> -</span><span id="remove_precision_parameterized_types-121"><a href="#remove_precision_parameterized_types-121"><span class="linenos">121</span></a> <span class="k">return</span> <span class="n">expression</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span> -</span><span id="remove_precision_parameterized_types-122"><a href="#remove_precision_parameterized_types-122"><span class="linenos">122</span></a> <span class="k">lambda</span> <span class="n">node</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">(</span> -</span><span id="remove_precision_parameterized_types-123"><a href="#remove_precision_parameterized_types-123"><span class="linenos">123</span></a> <span class="o">**</span><span class="p">{</span> -</span><span id="remove_precision_parameterized_types-124"><a href="#remove_precision_parameterized_types-124"><span class="linenos">124</span></a> <span class="o">**</span><span class="n">node</span><span class="o">.</span><span class="n">args</span><span class="p">,</span> -</span><span id="remove_precision_parameterized_types-125"><a href="#remove_precision_parameterized_types-125"><span class="linenos">125</span></a> <span class="s2">"expressions"</span><span class="p">:</span> <span class="p">[</span> -</span><span id="remove_precision_parameterized_types-126"><a href="#remove_precision_parameterized_types-126"><span class="linenos">126</span></a> <span class="n">node_expression</span> -</span><span id="remove_precision_parameterized_types-127"><a href="#remove_precision_parameterized_types-127"><span class="linenos">127</span></a> <span class="k">for</span> <span class="n">node_expression</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">expressions</span> -</span><span id="remove_precision_parameterized_types-128"><a href="#remove_precision_parameterized_types-128"><span class="linenos">128</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node_expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> -</span><span id="remove_precision_parameterized_types-129"><a href="#remove_precision_parameterized_types-129"><span class="linenos">129</span></a> <span class="p">],</span> -</span><span id="remove_precision_parameterized_types-130"><a href="#remove_precision_parameterized_types-130"><span class="linenos">130</span></a> <span class="p">}</span> -</span><span id="remove_precision_parameterized_types-131"><a href="#remove_precision_parameterized_types-131"><span class="linenos">131</span></a> <span class="p">)</span> -</span><span id="remove_precision_parameterized_types-132"><a href="#remove_precision_parameterized_types-132"><span class="linenos">132</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> -</span><span id="remove_precision_parameterized_types-133"><a href="#remove_precision_parameterized_types-133"><span class="linenos">133</span></a> <span class="k">else</span> <span class="n">node</span><span class="p">,</span> -</span><span id="remove_precision_parameterized_types-134"><a href="#remove_precision_parameterized_types-134"><span class="linenos">134</span></a> <span class="p">)</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="remove_precision_parameterized_types-120"><a href="#remove_precision_parameterized_types-120"><span class="linenos">120</span></a><span class="k">def</span> <span class="nf">remove_precision_parameterized_types</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="remove_precision_parameterized_types-121"><a href="#remove_precision_parameterized_types-121"><span class="linenos">121</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="remove_precision_parameterized_types-122"><a href="#remove_precision_parameterized_types-122"><span class="linenos">122</span></a><span class="sd"> Some dialects only allow the precision for parameterized types to be defined in the DDL and not in</span> +</span><span id="remove_precision_parameterized_types-123"><a href="#remove_precision_parameterized_types-123"><span class="linenos">123</span></a><span class="sd"> other expressions. This transforms removes the precision from parameterized types in expressions.</span> +</span><span id="remove_precision_parameterized_types-124"><a href="#remove_precision_parameterized_types-124"><span class="linenos">124</span></a><span class="sd"> """</span> +</span><span id="remove_precision_parameterized_types-125"><a href="#remove_precision_parameterized_types-125"><span class="linenos">125</span></a> <span class="k">return</span> <span class="n">expression</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span> +</span><span id="remove_precision_parameterized_types-126"><a href="#remove_precision_parameterized_types-126"><span class="linenos">126</span></a> <span class="k">lambda</span> <span class="n">node</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">(</span> +</span><span id="remove_precision_parameterized_types-127"><a href="#remove_precision_parameterized_types-127"><span class="linenos">127</span></a> <span class="o">**</span><span class="p">{</span> +</span><span id="remove_precision_parameterized_types-128"><a href="#remove_precision_parameterized_types-128"><span class="linenos">128</span></a> <span class="o">**</span><span class="n">node</span><span class="o">.</span><span class="n">args</span><span class="p">,</span> +</span><span id="remove_precision_parameterized_types-129"><a href="#remove_precision_parameterized_types-129"><span class="linenos">129</span></a> <span class="s2">"expressions"</span><span class="p">:</span> <span class="p">[</span> +</span><span id="remove_precision_parameterized_types-130"><a href="#remove_precision_parameterized_types-130"><span class="linenos">130</span></a> <span class="n">node_expression</span> +</span><span id="remove_precision_parameterized_types-131"><a href="#remove_precision_parameterized_types-131"><span class="linenos">131</span></a> <span class="k">for</span> <span class="n">node_expression</span> <span class="ow">in</span> <span class="n">node</span><span class="o">.</span><span class="n">expressions</span> +</span><span id="remove_precision_parameterized_types-132"><a href="#remove_precision_parameterized_types-132"><span class="linenos">132</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node_expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> +</span><span id="remove_precision_parameterized_types-133"><a href="#remove_precision_parameterized_types-133"><span class="linenos">133</span></a> <span class="p">],</span> +</span><span id="remove_precision_parameterized_types-134"><a href="#remove_precision_parameterized_types-134"><span class="linenos">134</span></a> <span class="p">}</span> +</span><span id="remove_precision_parameterized_types-135"><a href="#remove_precision_parameterized_types-135"><span class="linenos">135</span></a> <span class="p">)</span> +</span><span id="remove_precision_parameterized_types-136"><a href="#remove_precision_parameterized_types-136"><span class="linenos">136</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">DataType</span><span class="p">)</span> +</span><span id="remove_precision_parameterized_types-137"><a href="#remove_precision_parameterized_types-137"><span class="linenos">137</span></a> <span class="k">else</span> <span class="n">node</span><span class="p">,</span> +</span><span id="remove_precision_parameterized_types-138"><a href="#remove_precision_parameterized_types-138"><span class="linenos">138</span></a> <span class="p">)</span> </span></pre></div> @@ -491,40 +594,192 @@ other expressions. This transforms removes the precision from parameterized type </section> + <section id="unnest_to_explode"> + <input id="unnest_to_explode-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> +<div class="attr function"> + + <span class="def">def</span> + <span class="name">unnest_to_explode</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">expression</span><span class="p">:</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span></span><span class="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span> + + <label class="view-source-button" for="unnest_to_explode-view-source"><span>View Source</span></label> + + </div> + <a class="headerlink" href="#unnest_to_explode"></a> + <div class="pdoc-code codehilite"><pre><span></span><span id="unnest_to_explode-141"><a href="#unnest_to_explode-141"><span class="linenos">141</span></a><span class="k">def</span> <span class="nf">unnest_to_explode</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="unnest_to_explode-142"><a href="#unnest_to_explode-142"><span class="linenos">142</span></a><span class="w"> </span><span class="sd">"""Convert cross join unnest into lateral view explode (used in presto -> hive)."""</span> +</span><span id="unnest_to_explode-143"><a href="#unnest_to_explode-143"><span class="linenos">143</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> +</span><span id="unnest_to_explode-144"><a href="#unnest_to_explode-144"><span class="linenos">144</span></a> <span class="k">for</span> <span class="n">join</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">)</span> <span class="ow">or</span> <span class="p">[]:</span> +</span><span id="unnest_to_explode-145"><a href="#unnest_to_explode-145"><span class="linenos">145</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">join</span><span class="o">.</span><span class="n">this</span> +</span><span id="unnest_to_explode-146"><a href="#unnest_to_explode-146"><span class="linenos">146</span></a> +</span><span id="unnest_to_explode-147"><a href="#unnest_to_explode-147"><span class="linenos">147</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">):</span> +</span><span id="unnest_to_explode-148"><a href="#unnest_to_explode-148"><span class="linenos">148</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">unnest</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">)</span> +</span><span id="unnest_to_explode-149"><a href="#unnest_to_explode-149"><span class="linenos">149</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span> <span class="k">if</span> <span class="n">unnest</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"ordinality"</span><span class="p">)</span> <span class="k">else</span> <span class="n">exp</span><span class="o">.</span><span class="n">Explode</span> +</span><span id="unnest_to_explode-150"><a href="#unnest_to_explode-150"><span class="linenos">150</span></a> +</span><span id="unnest_to_explode-151"><a href="#unnest_to_explode-151"><span class="linenos">151</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="p">[</span><span class="s2">"joins"</span><span class="p">]</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">join</span><span class="p">)</span> +</span><span id="unnest_to_explode-152"><a href="#unnest_to_explode-152"><span class="linenos">152</span></a> +</span><span id="unnest_to_explode-153"><a href="#unnest_to_explode-153"><span class="linenos">153</span></a> <span class="k">for</span> <span class="n">e</span><span class="p">,</span> <span class="n">column</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">unnest</span><span class="o">.</span><span class="n">expressions</span><span class="p">,</span> <span class="n">alias</span><span class="o">.</span><span class="n">columns</span> <span class="k">if</span> <span class="n">alias</span> <span class="k">else</span> <span class="p">[]):</span> +</span><span id="unnest_to_explode-154"><a href="#unnest_to_explode-154"><span class="linenos">154</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> +</span><span id="unnest_to_explode-155"><a href="#unnest_to_explode-155"><span class="linenos">155</span></a> <span class="s2">"laterals"</span><span class="p">,</span> +</span><span id="unnest_to_explode-156"><a href="#unnest_to_explode-156"><span class="linenos">156</span></a> <span class="n">exp</span><span class="o">.</span><span class="n">Lateral</span><span class="p">(</span> +</span><span id="unnest_to_explode-157"><a href="#unnest_to_explode-157"><span class="linenos">157</span></a> <span class="n">this</span><span class="o">=</span><span class="n">udtf</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">e</span><span class="p">),</span> +</span><span id="unnest_to_explode-158"><a href="#unnest_to_explode-158"><span class="linenos">158</span></a> <span class="n">view</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> +</span><span id="unnest_to_explode-159"><a href="#unnest_to_explode-159"><span class="linenos">159</span></a> <span class="n">alias</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span><span class="n">this</span><span class="o">=</span><span class="n">alias</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">columns</span><span class="o">=</span><span class="p">[</span><span class="n">column</span><span class="p">]),</span> <span class="c1"># type: ignore</span> +</span><span id="unnest_to_explode-160"><a href="#unnest_to_explode-160"><span class="linenos">160</span></a> <span class="p">),</span> +</span><span id="unnest_to_explode-161"><a href="#unnest_to_explode-161"><span class="linenos">161</span></a> <span class="p">)</span> +</span><span id="unnest_to_explode-162"><a href="#unnest_to_explode-162"><span class="linenos">162</span></a> <span class="k">return</span> <span class="n">expression</span> +</span></pre></div> + + + <div class="docstring"><p>Convert cross join unnest into lateral view explode (used in presto -> hive).</p> +</div> + + + </section> + <section id="explode_to_unnest"> + <input id="explode_to_unnest-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> +<div class="attr function"> + + <span class="def">def</span> + <span class="name">explode_to_unnest</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">expression</span><span class="p">:</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span></span><span class="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span> + + <label class="view-source-button" for="explode_to_unnest-view-source"><span>View Source</span></label> + + </div> + <a class="headerlink" href="#explode_to_unnest"></a> + <div class="pdoc-code codehilite"><pre><span></span><span id="explode_to_unnest-165"><a href="#explode_to_unnest-165"><span class="linenos">165</span></a><span class="k">def</span> <span class="nf">explode_to_unnest</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="explode_to_unnest-166"><a href="#explode_to_unnest-166"><span class="linenos">166</span></a><span class="w"> </span><span class="sd">"""Convert explode/posexplode into unnest (used in hive -> presto)."""</span> +</span><span id="explode_to_unnest-167"><a href="#explode_to_unnest-167"><span class="linenos">167</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Select</span><span class="p">):</span> +</span><span id="explode_to_unnest-168"><a href="#explode_to_unnest-168"><span class="linenos">168</span></a> <span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">build_scope</span> +</span><span id="explode_to_unnest-169"><a href="#explode_to_unnest-169"><span class="linenos">169</span></a> +</span><span id="explode_to_unnest-170"><a href="#explode_to_unnest-170"><span class="linenos">170</span></a> <span class="n">taken_select_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">expression</span><span class="o">.</span><span class="n">named_selects</span><span class="p">)</span> +</span><span id="explode_to_unnest-171"><a href="#explode_to_unnest-171"><span class="linenos">171</span></a> <span class="n">taken_source_names</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">build_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span><span class="o">.</span><span class="n">selected_sources</span><span class="p">)</span> +</span><span id="explode_to_unnest-172"><a href="#explode_to_unnest-172"><span class="linenos">172</span></a> +</span><span id="explode_to_unnest-173"><a href="#explode_to_unnest-173"><span class="linenos">173</span></a> <span class="k">for</span> <span class="n">select</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">selects</span><span class="p">:</span> +</span><span id="explode_to_unnest-174"><a href="#explode_to_unnest-174"><span class="linenos">174</span></a> <span class="n">to_replace</span> <span class="o">=</span> <span class="n">select</span> +</span><span id="explode_to_unnest-175"><a href="#explode_to_unnest-175"><span class="linenos">175</span></a> +</span><span id="explode_to_unnest-176"><a href="#explode_to_unnest-176"><span class="linenos">176</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="s2">""</span> +</span><span id="explode_to_unnest-177"><a href="#explode_to_unnest-177"><span class="linenos">177</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="s2">""</span> +</span><span id="explode_to_unnest-178"><a href="#explode_to_unnest-178"><span class="linenos">178</span></a> +</span><span id="explode_to_unnest-179"><a href="#explode_to_unnest-179"><span class="linenos">179</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Alias</span><span class="p">):</span> +</span><span id="explode_to_unnest-180"><a href="#explode_to_unnest-180"><span class="linenos">180</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">alias</span> +</span><span id="explode_to_unnest-181"><a href="#explode_to_unnest-181"><span class="linenos">181</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span> +</span><span id="explode_to_unnest-182"><a href="#explode_to_unnest-182"><span class="linenos">182</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Aliases</span><span class="p">):</span> +</span><span id="explode_to_unnest-183"><a href="#explode_to_unnest-183"><span class="linenos">183</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> +</span><span id="explode_to_unnest-184"><a href="#explode_to_unnest-184"><span class="linenos">184</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">aliases</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">name</span> +</span><span id="explode_to_unnest-185"><a href="#explode_to_unnest-185"><span class="linenos">185</span></a> <span class="n">select</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span> +</span><span id="explode_to_unnest-186"><a href="#explode_to_unnest-186"><span class="linenos">186</span></a> +</span><span id="explode_to_unnest-187"><a href="#explode_to_unnest-187"><span class="linenos">187</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">Explode</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)):</span> +</span><span id="explode_to_unnest-188"><a href="#explode_to_unnest-188"><span class="linenos">188</span></a> <span class="n">is_posexplode</span> <span class="o">=</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">select</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Posexplode</span><span class="p">)</span> +</span><span id="explode_to_unnest-189"><a href="#explode_to_unnest-189"><span class="linenos">189</span></a> +</span><span id="explode_to_unnest-190"><a href="#explode_to_unnest-190"><span class="linenos">190</span></a> <span class="n">explode_arg</span> <span class="o">=</span> <span class="n">select</span><span class="o">.</span><span class="n">this</span> +</span><span id="explode_to_unnest-191"><a href="#explode_to_unnest-191"><span class="linenos">191</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">Unnest</span><span class="p">(</span><span class="n">expressions</span><span class="o">=</span><span class="p">[</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">copy</span><span class="p">()],</span> <span class="n">ordinality</span><span class="o">=</span><span class="n">is_posexplode</span><span class="p">)</span> +</span><span id="explode_to_unnest-192"><a href="#explode_to_unnest-192"><span class="linenos">192</span></a> +</span><span id="explode_to_unnest-193"><a href="#explode_to_unnest-193"><span class="linenos">193</span></a> <span class="c1"># This ensures that we won't use [POS]EXPLODE's argument as a new selection</span> +</span><span id="explode_to_unnest-194"><a href="#explode_to_unnest-194"><span class="linenos">194</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">explode_arg</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">):</span> +</span><span id="explode_to_unnest-195"><a href="#explode_to_unnest-195"><span class="linenos">195</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_arg</span><span class="o">.</span><span class="n">output_name</span><span class="p">)</span> +</span><span id="explode_to_unnest-196"><a href="#explode_to_unnest-196"><span class="linenos">196</span></a> +</span><span id="explode_to_unnest-197"><a href="#explode_to_unnest-197"><span class="linenos">197</span></a> <span class="n">unnest_source_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_source_names</span><span class="p">,</span> <span class="s2">"_u"</span><span class="p">)</span> +</span><span id="explode_to_unnest-198"><a href="#explode_to_unnest-198"><span class="linenos">198</span></a> <span class="n">taken_source_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">unnest_source_alias</span><span class="p">)</span> +</span><span id="explode_to_unnest-199"><a href="#explode_to_unnest-199"><span class="linenos">199</span></a> +</span><span id="explode_to_unnest-200"><a href="#explode_to_unnest-200"><span class="linenos">200</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">explode_alias</span><span class="p">:</span> +</span><span id="explode_to_unnest-201"><a href="#explode_to_unnest-201"><span class="linenos">201</span></a> <span class="n">explode_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"col"</span><span class="p">)</span> +</span><span id="explode_to_unnest-202"><a href="#explode_to_unnest-202"><span class="linenos">202</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">)</span> +</span><span id="explode_to_unnest-203"><a href="#explode_to_unnest-203"><span class="linenos">203</span></a> +</span><span id="explode_to_unnest-204"><a href="#explode_to_unnest-204"><span class="linenos">204</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span> +</span><span id="explode_to_unnest-205"><a href="#explode_to_unnest-205"><span class="linenos">205</span></a> <span class="n">pos_alias</span> <span class="o">=</span> <span class="n">find_new_name</span><span class="p">(</span><span class="n">taken_select_names</span><span class="p">,</span> <span class="s2">"pos"</span><span class="p">)</span> +</span><span id="explode_to_unnest-206"><a href="#explode_to_unnest-206"><span class="linenos">206</span></a> <span class="n">taken_select_names</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">)</span> +</span><span id="explode_to_unnest-207"><a href="#explode_to_unnest-207"><span class="linenos">207</span></a> +</span><span id="explode_to_unnest-208"><a href="#explode_to_unnest-208"><span class="linenos">208</span></a> <span class="k">if</span> <span class="n">is_posexplode</span><span class="p">:</span> +</span><span id="explode_to_unnest-209"><a href="#explode_to_unnest-209"><span class="linenos">209</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">,</span> <span class="n">pos_alias</span><span class="p">]</span> +</span><span id="explode_to_unnest-210"><a href="#explode_to_unnest-210"><span class="linenos">210</span></a> <span class="n">to_replace</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span> +</span><span id="explode_to_unnest-211"><a href="#explode_to_unnest-211"><span class="linenos">211</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">pos_alias</span><span class="p">,</span> <span class="n">explode_alias</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="explode_to_unnest-212"><a href="#explode_to_unnest-212"><span class="linenos">212</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="explode_to_unnest-213"><a href="#explode_to_unnest-213"><span class="linenos">213</span></a> <span class="n">column_names</span> <span class="o">=</span> <span class="p">[</span><span class="n">explode_alias</span><span class="p">]</span> +</span><span id="explode_to_unnest-214"><a href="#explode_to_unnest-214"><span class="linenos">214</span></a> <span class="n">to_replace</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">explode_alias</span><span class="p">))</span> +</span><span id="explode_to_unnest-215"><a href="#explode_to_unnest-215"><span class="linenos">215</span></a> +</span><span id="explode_to_unnest-216"><a href="#explode_to_unnest-216"><span class="linenos">216</span></a> <span class="n">unnest</span> <span class="o">=</span> <span class="n">exp</span><span class="o">.</span><span class="n">alias_</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">unnest_source_alias</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="n">column_names</span><span class="p">)</span> +</span><span id="explode_to_unnest-217"><a href="#explode_to_unnest-217"><span class="linenos">217</span></a> +</span><span id="explode_to_unnest-218"><a href="#explode_to_unnest-218"><span class="linenos">218</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">expression</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"from"</span><span class="p">):</span> +</span><span id="explode_to_unnest-219"><a href="#explode_to_unnest-219"><span class="linenos">219</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="explode_to_unnest-220"><a href="#explode_to_unnest-220"><span class="linenos">220</span></a> <span class="k">else</span><span class="p">:</span> +</span><span id="explode_to_unnest-221"><a href="#explode_to_unnest-221"><span class="linenos">221</span></a> <span class="n">expression</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">unnest</span><span class="p">,</span> <span class="n">join_type</span><span class="o">=</span><span class="s2">"CROSS"</span><span class="p">,</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> +</span><span id="explode_to_unnest-222"><a href="#explode_to_unnest-222"><span class="linenos">222</span></a> +</span><span id="explode_to_unnest-223"><a href="#explode_to_unnest-223"><span class="linenos">223</span></a> <span class="k">return</span> <span class="n">expression</span> +</span></pre></div> + + + <div class="docstring"><p>Convert explode/posexplode into unnest (used in hive -> presto).</p> +</div> + + + </section> + <section id="remove_target_from_merge"> + <input id="remove_target_from_merge-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> +<div class="attr function"> + + <span class="def">def</span> + <span class="name">remove_target_from_merge</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">expression</span><span class="p">:</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span></span><span class="return-annotation">) -> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span>:</span></span> + + <label class="view-source-button" for="remove_target_from_merge-view-source"><span>View Source</span></label> + + </div> + <a class="headerlink" href="#remove_target_from_merge"></a> + <div class="pdoc-code codehilite"><pre><span></span><span id="remove_target_from_merge-226"><a href="#remove_target_from_merge-226"><span class="linenos">226</span></a><span class="k">def</span> <span class="nf">remove_target_from_merge</span><span class="p">(</span><span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">:</span> +</span><span id="remove_target_from_merge-227"><a href="#remove_target_from_merge-227"><span class="linenos">227</span></a><span class="w"> </span><span class="sd">"""Remove table refs from columns in when statements."""</span> +</span><span id="remove_target_from_merge-228"><a href="#remove_target_from_merge-228"><span class="linenos">228</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Merge</span><span class="p">):</span> +</span><span id="remove_target_from_merge-229"><a href="#remove_target_from_merge-229"><span class="linenos">229</span></a> <span class="n">alias</span> <span class="o">=</span> <span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">)</span> +</span><span id="remove_target_from_merge-230"><a href="#remove_target_from_merge-230"><span class="linenos">230</span></a> <span class="n">targets</span> <span class="o">=</span> <span class="p">{</span><span class="n">expression</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">this</span><span class="p">}</span> +</span><span id="remove_target_from_merge-231"><a href="#remove_target_from_merge-231"><span class="linenos">231</span></a> <span class="k">if</span> <span class="n">alias</span><span class="p">:</span> +</span><span id="remove_target_from_merge-232"><a href="#remove_target_from_merge-232"><span class="linenos">232</span></a> <span class="n">targets</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">alias</span><span class="o">.</span><span class="n">this</span><span class="p">)</span> +</span><span id="remove_target_from_merge-233"><a href="#remove_target_from_merge-233"><span class="linenos">233</span></a> +</span><span id="remove_target_from_merge-234"><a href="#remove_target_from_merge-234"><span class="linenos">234</span></a> <span class="k">for</span> <span class="n">when</span> <span class="ow">in</span> <span class="n">expression</span><span class="o">.</span><span class="n">expressions</span><span class="p">:</span> +</span><span id="remove_target_from_merge-235"><a href="#remove_target_from_merge-235"><span class="linenos">235</span></a> <span class="n">when</span><span class="o">.</span><span class="n">transform</span><span class="p">(</span> +</span><span id="remove_target_from_merge-236"><a href="#remove_target_from_merge-236"><span class="linenos">236</span></a> <span class="k">lambda</span> <span class="n">node</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">column</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">name</span><span class="p">)</span> +</span><span id="remove_target_from_merge-237"><a href="#remove_target_from_merge-237"><span class="linenos">237</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Column</span><span class="p">)</span> <span class="ow">and</span> <span class="n">node</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"table"</span><span class="p">)</span> <span class="ow">in</span> <span class="n">targets</span> +</span><span id="remove_target_from_merge-238"><a href="#remove_target_from_merge-238"><span class="linenos">238</span></a> <span class="k">else</span> <span class="n">node</span><span class="p">,</span> +</span><span id="remove_target_from_merge-239"><a href="#remove_target_from_merge-239"><span class="linenos">239</span></a> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> +</span><span id="remove_target_from_merge-240"><a href="#remove_target_from_merge-240"><span class="linenos">240</span></a> <span class="p">)</span> +</span><span id="remove_target_from_merge-241"><a href="#remove_target_from_merge-241"><span class="linenos">241</span></a> <span class="k">return</span> <span class="n">expression</span> +</span></pre></div> + + + <div class="docstring"><p>Remove table refs from columns in when statements.</p> +</div> + + + </section> <section id="preprocess"> <input id="preprocess-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> <div class="attr function"> <span class="def">def</span> - <span class="name">preprocess</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">transforms</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">Callable</span><span class="p">[[</span><span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">],</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">]]</span>,</span><span class="param"> <span class="n">to_sql</span><span class="p">:</span> <span class="n">Callable</span><span class="p">[[</span><span class="n"><a href="generator.html#Generator">sqlglot.generator.Generator</a></span><span class="p">,</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">],</span> <span class="nb">str</span><span class="p">]</span></span><span class="return-annotation">) -> <span class="n">Callable</span><span class="p">[[</span><span class="n"><a href="generator.html#Generator">sqlglot.generator.Generator</a></span><span class="p">,</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">],</span> <span class="nb">str</span><span class="p">]</span>:</span></span> + <span class="name">preprocess</span><span class="signature pdoc-code multiline">(<span class="param"> <span class="n">transforms</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">Callable</span><span class="p">[[</span><span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">],</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">]]</span></span><span class="return-annotation">) -> <span class="n">Callable</span><span class="p">[[</span><span class="n"><a href="generator.html#Generator">sqlglot.generator.Generator</a></span><span class="p">,</span> <span class="n"><a href="expressions.html#Expression">sqlglot.expressions.Expression</a></span><span class="p">],</span> <span class="nb">str</span><span class="p">]</span>:</span></span> <label class="view-source-button" for="preprocess-view-source"><span>View Source</span></label> </div> <a class="headerlink" href="#preprocess"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="preprocess-137"><a href="#preprocess-137"><span class="linenos">137</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> -</span><span id="preprocess-138"><a href="#preprocess-138"><span class="linenos">138</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> -</span><span id="preprocess-139"><a href="#preprocess-139"><span class="linenos">139</span></a> <span class="n">to_sql</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">],</span> -</span><span id="preprocess-140"><a href="#preprocess-140"><span class="linenos">140</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> -</span><span id="preprocess-141"><a href="#preprocess-141"><span class="linenos">141</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="preprocess-142"><a href="#preprocess-142"><span class="linenos">142</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> -</span><span id="preprocess-143"><a href="#preprocess-143"><span class="linenos">143</span></a><span class="sd"> expression to SQL, using an appropriate `Generator.TRANSFORMS` function.</span> -</span><span id="preprocess-144"><a href="#preprocess-144"><span class="linenos">144</span></a> -</span><span id="preprocess-145"><a href="#preprocess-145"><span class="linenos">145</span></a><span class="sd"> Args:</span> -</span><span id="preprocess-146"><a href="#preprocess-146"><span class="linenos">146</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> -</span><span id="preprocess-147"><a href="#preprocess-147"><span class="linenos">147</span></a><span class="sd"> to_sql: final transform that converts the resulting expression to a SQL string.</span> -</span><span id="preprocess-148"><a href="#preprocess-148"><span class="linenos">148</span></a> -</span><span id="preprocess-149"><a href="#preprocess-149"><span class="linenos">149</span></a><span class="sd"> Returns:</span> -</span><span id="preprocess-150"><a href="#preprocess-150"><span class="linenos">150</span></a><span class="sd"> Function that can be used as a generator transform.</span> -</span><span id="preprocess-151"><a href="#preprocess-151"><span class="linenos">151</span></a><span class="sd"> """</span> -</span><span id="preprocess-152"><a href="#preprocess-152"><span class="linenos">152</span></a> -</span><span id="preprocess-153"><a href="#preprocess-153"><span class="linenos">153</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">):</span> -</span><span id="preprocess-154"><a href="#preprocess-154"><span class="linenos">154</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> -</span><span id="preprocess-155"><a href="#preprocess-155"><span class="linenos">155</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> -</span><span id="preprocess-156"><a href="#preprocess-156"><span class="linenos">156</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> -</span><span id="preprocess-157"><a href="#preprocess-157"><span class="linenos">157</span></a> <span class="k">return</span> <span class="n">to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">)</span> -</span><span id="preprocess-158"><a href="#preprocess-158"><span class="linenos">158</span></a> -</span><span id="preprocess-159"><a href="#preprocess-159"><span class="linenos">159</span></a> <span class="k">return</span> <span class="n">_to_sql</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="preprocess-244"><a href="#preprocess-244"><span class="linenos">244</span></a><span class="k">def</span> <span class="nf">preprocess</span><span class="p">(</span> +</span><span id="preprocess-245"><a href="#preprocess-245"><span class="linenos">245</span></a> <span class="n">transforms</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">List</span><span class="p">[</span><span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">]],</span> +</span><span id="preprocess-246"><a href="#preprocess-246"><span class="linenos">246</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">[[</span><span class="n">Generator</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">],</span> <span class="nb">str</span><span class="p">]:</span> +</span><span id="preprocess-247"><a href="#preprocess-247"><span class="linenos">247</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="preprocess-248"><a href="#preprocess-248"><span class="linenos">248</span></a><span class="sd"> Creates a new transform by chaining a sequence of transformations and converts the resulting</span> +</span><span id="preprocess-249"><a href="#preprocess-249"><span class="linenos">249</span></a><span class="sd"> expression to SQL, using an appropriate `Generator.TRANSFORMS` function.</span> +</span><span id="preprocess-250"><a href="#preprocess-250"><span class="linenos">250</span></a> +</span><span id="preprocess-251"><a href="#preprocess-251"><span class="linenos">251</span></a><span class="sd"> Args:</span> +</span><span id="preprocess-252"><a href="#preprocess-252"><span class="linenos">252</span></a><span class="sd"> transforms: sequence of transform functions. These will be called in order.</span> +</span><span id="preprocess-253"><a href="#preprocess-253"><span class="linenos">253</span></a> +</span><span id="preprocess-254"><a href="#preprocess-254"><span class="linenos">254</span></a><span class="sd"> Returns:</span> +</span><span id="preprocess-255"><a href="#preprocess-255"><span class="linenos">255</span></a><span class="sd"> Function that can be used as a generator transform.</span> +</span><span id="preprocess-256"><a href="#preprocess-256"><span class="linenos">256</span></a><span class="sd"> """</span> +</span><span id="preprocess-257"><a href="#preprocess-257"><span class="linenos">257</span></a> +</span><span id="preprocess-258"><a href="#preprocess-258"><span class="linenos">258</span></a> <span class="k">def</span> <span class="nf">_to_sql</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="p">:</span> <span class="n">exp</span><span class="o">.</span><span class="n">Expression</span><span class="p">)</span> <span class="o">-></span> <span class="nb">str</span><span class="p">:</span> +</span><span id="preprocess-259"><a href="#preprocess-259"><span class="linenos">259</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">0</span><span class="p">](</span><span class="n">expression</span><span class="o">.</span><span class="n">copy</span><span class="p">())</span> +</span><span id="preprocess-260"><a href="#preprocess-260"><span class="linenos">260</span></a> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">transforms</span><span class="p">[</span><span class="mi">1</span><span class="p">:]:</span> +</span><span id="preprocess-261"><a href="#preprocess-261"><span class="linenos">261</span></a> <span class="n">expression</span> <span class="o">=</span> <span class="n">t</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="preprocess-262"><a href="#preprocess-262"><span class="linenos">262</span></a> <span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">expression</span><span class="o">.</span><span class="n">key</span> <span class="o">+</span> <span class="s2">"_sql"</span><span class="p">)(</span><span class="n">expression</span><span class="p">)</span> +</span><span id="preprocess-263"><a href="#preprocess-263"><span class="linenos">263</span></a> +</span><span id="preprocess-264"><a href="#preprocess-264"><span class="linenos">264</span></a> <span class="k">return</span> <span class="n">_to_sql</span> </span></pre></div> @@ -535,7 +790,6 @@ expression to SQL, using an appropriate <code>Generator.TRANSFORMS</code> functi <ul> <li><strong>transforms:</strong> sequence of transform functions. These will be called in order.</li> -<li><strong>to_sql:</strong> final transform that converts the resulting expression to a SQL string.</li> </ul> <h6 id="returns">Returns:</h6> @@ -547,36 +801,6 @@ expression to SQL, using an appropriate <code>Generator.TRANSFORMS</code> functi </section> - <section id="delegate"> - <input id="delegate-view-source" class="view-source-toggle-state" type="checkbox" aria-hidden="true" tabindex="-1"> -<div class="attr function"> - - <span class="def">def</span> - <span class="name">delegate</span><span class="signature pdoc-code condensed">(<span class="param"><span class="n">attr</span><span class="p">:</span> <span class="nb">str</span></span><span class="return-annotation">) -> <span class="n">Callable</span>:</span></span> - - <label class="view-source-button" for="delegate-view-source"><span>View Source</span></label> - - </div> - <a class="headerlink" href="#delegate"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="delegate-162"><a href="#delegate-162"><span class="linenos">162</span></a><span class="k">def</span> <span class="nf">delegate</span><span class="p">(</span><span class="n">attr</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-></span> <span class="n">t</span><span class="o">.</span><span class="n">Callable</span><span class="p">:</span> -</span><span id="delegate-163"><a href="#delegate-163"><span class="linenos">163</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="delegate-164"><a href="#delegate-164"><span class="linenos">164</span></a><span class="sd"> Create a new method that delegates to `attr`. This is useful for creating `Generator.TRANSFORMS`</span> -</span><span id="delegate-165"><a href="#delegate-165"><span class="linenos">165</span></a><span class="sd"> functions that delegate to existing generator methods.</span> -</span><span id="delegate-166"><a href="#delegate-166"><span class="linenos">166</span></a><span class="sd"> """</span> -</span><span id="delegate-167"><a href="#delegate-167"><span class="linenos">167</span></a> -</span><span id="delegate-168"><a href="#delegate-168"><span class="linenos">168</span></a> <span class="k">def</span> <span class="nf">_transform</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> -</span><span id="delegate-169"><a href="#delegate-169"><span class="linenos">169</span></a> <span class="k">return</span> <span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">attr</span><span class="p">)(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> -</span><span id="delegate-170"><a href="#delegate-170"><span class="linenos">170</span></a> -</span><span id="delegate-171"><a href="#delegate-171"><span class="linenos">171</span></a> <span class="k">return</span> <span class="n">_transform</span> -</span></pre></div> - - - <div class="docstring"><p>Create a new method that delegates to <code>attr</code>. This is useful for creating <code>Generator.TRANSFORMS</code> -functions that delegate to existing generator methods.</p> -</div> - - - </section> </main> <script> function escapeHTML(html) { |