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Diffstat (limited to 'docs/sqlglot/optimizer/qualify_tables.html')
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diff --git a/docs/sqlglot/optimizer/qualify_tables.html b/docs/sqlglot/optimizer/qualify_tables.html index 29506d7..6180c92 100644 --- a/docs/sqlglot/optimizer/qualify_tables.html +++ b/docs/sqlglot/optimizer/qualify_tables.html @@ -56,111 +56,104 @@ <label class="view-source-button" for="mod-qualify_tables-view-source"><span>View Source</span></label> - <div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">import</span> <span class="nn">itertools</span> -</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a><span class="kn">import</span> <span class="nn">typing</span> <span class="k">as</span> <span class="nn">t</span> -</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a> -</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">alias</span><span class="p">,</span> <span class="n">exp</span> -</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="kn">from</span> <span class="nn">sqlglot._typing</span> <span class="kn">import</span> <span class="n">E</span> -</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">csv_reader</span><span class="p">,</span> <span class="n">name_sequence</span> -</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">Scope</span><span class="p">,</span> <span class="n">traverse_scope</span> -</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="kn">from</span> <span class="nn">sqlglot.schema</span> <span class="kn">import</span> <span class="n">Schema</span> -</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a> -</span><span id="L-10"><a href="#L-10"><span class="linenos"> 10</span></a> -</span><span id="L-11"><a href="#L-11"><span class="linenos"> 11</span></a><span class="k">def</span> <span class="nf">qualify_tables</span><span class="p">(</span> -</span><span id="L-12"><a href="#L-12"><span class="linenos"> 12</span></a> <span class="n">expression</span><span class="p">:</span> <span class="n">E</span><span class="p">,</span> -</span><span id="L-13"><a href="#L-13"><span class="linenos"> 13</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> -</span><span id="L-14"><a href="#L-14"><span class="linenos"> 14</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> -</span><span id="L-15"><a href="#L-15"><span class="linenos"> 15</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> -</span><span id="L-16"><a href="#L-16"><span class="linenos"> 16</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">E</span><span class="p">:</span> -</span><span id="L-17"><a href="#L-17"><span class="linenos"> 17</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="L-18"><a href="#L-18"><span class="linenos"> 18</span></a><span class="sd"> Rewrite sqlglot AST to have fully qualified tables. Additionally, this</span> -</span><span id="L-19"><a href="#L-19"><span class="linenos"> 19</span></a><span class="sd"> replaces "join constructs" (*) by equivalent SELECT * subqueries.</span> -</span><span id="L-20"><a href="#L-20"><span class="linenos"> 20</span></a> -</span><span id="L-21"><a href="#L-21"><span class="linenos"> 21</span></a><span class="sd"> Examples:</span> -</span><span id="L-22"><a href="#L-22"><span class="linenos"> 22</span></a><span class="sd"> >>> import sqlglot</span> -</span><span id="L-23"><a href="#L-23"><span class="linenos"> 23</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT 1 FROM tbl")</span> -</span><span id="L-24"><a href="#L-24"><span class="linenos"> 24</span></a><span class="sd"> >>> qualify_tables(expression, db="db").sql()</span> -</span><span id="L-25"><a href="#L-25"><span class="linenos"> 25</span></a><span class="sd"> 'SELECT 1 FROM db.tbl AS tbl'</span> -</span><span id="L-26"><a href="#L-26"><span class="linenos"> 26</span></a><span class="sd"> >>></span> -</span><span id="L-27"><a href="#L-27"><span class="linenos"> 27</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT * FROM (tbl1 JOIN tbl2 ON id1 = id2)")</span> -</span><span id="L-28"><a href="#L-28"><span class="linenos"> 28</span></a><span class="sd"> >>> qualify_tables(expression).sql()</span> -</span><span id="L-29"><a href="#L-29"><span class="linenos"> 29</span></a><span class="sd"> 'SELECT * FROM (SELECT * FROM tbl1 AS tbl1 JOIN tbl2 AS tbl2 ON id1 = id2) AS _q_0'</span> -</span><span id="L-30"><a href="#L-30"><span class="linenos"> 30</span></a> -</span><span id="L-31"><a href="#L-31"><span class="linenos"> 31</span></a><span class="sd"> Args:</span> -</span><span id="L-32"><a href="#L-32"><span class="linenos"> 32</span></a><span class="sd"> expression: Expression to qualify</span> -</span><span id="L-33"><a href="#L-33"><span class="linenos"> 33</span></a><span class="sd"> db: Database name</span> -</span><span id="L-34"><a href="#L-34"><span class="linenos"> 34</span></a><span class="sd"> catalog: Catalog name</span> -</span><span id="L-35"><a href="#L-35"><span class="linenos"> 35</span></a><span class="sd"> schema: A schema to populate</span> -</span><span id="L-36"><a href="#L-36"><span class="linenos"> 36</span></a> -</span><span id="L-37"><a href="#L-37"><span class="linenos"> 37</span></a><span class="sd"> Returns:</span> -</span><span id="L-38"><a href="#L-38"><span class="linenos"> 38</span></a><span class="sd"> The qualified expression.</span> -</span><span id="L-39"><a href="#L-39"><span class="linenos"> 39</span></a> -</span><span id="L-40"><a href="#L-40"><span class="linenos"> 40</span></a><span class="sd"> (*) See section 7.2.1.2 in https://www.postgresql.org/docs/current/queries-table-expressions.html</span> -</span><span id="L-41"><a href="#L-41"><span class="linenos"> 41</span></a><span class="sd"> """</span> -</span><span id="L-42"><a href="#L-42"><span class="linenos"> 42</span></a> <span class="n">next_alias_name</span> <span class="o">=</span> <span class="n">name_sequence</span><span class="p">(</span><span class="s2">"_q_"</span><span class="p">)</span> -</span><span id="L-43"><a href="#L-43"><span class="linenos"> 43</span></a> -</span><span id="L-44"><a href="#L-44"><span class="linenos"> 44</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="L-45"><a href="#L-45"><span class="linenos"> 45</span></a> <span class="k">for</span> <span class="n">derived_table</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">ctes</span><span class="p">,</span> <span class="n">scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">):</span> -</span><span id="L-46"><a href="#L-46"><span class="linenos"> 46</span></a> <span class="c1"># Expand join construct</span> -</span><span id="L-47"><a href="#L-47"><span class="linenos"> 47</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">derived_table</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span> -</span><span id="L-48"><a href="#L-48"><span class="linenos"> 48</span></a> <span class="n">unnested</span> <span class="o">=</span> <span class="n">derived_table</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span> -</span><span id="L-49"><a href="#L-49"><span class="linenos"> 49</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnested</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> -</span><span id="L-50"><a href="#L-50"><span class="linenos"> 50</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">this</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">select</span><span class="p">(</span><span class="s2">"*"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnested</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-51"><a href="#L-51"><span class="linenos"> 51</span></a> -</span><span id="L-52"><a href="#L-52"><span class="linenos"> 52</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">derived_table</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-53"><a href="#L-53"><span class="linenos"> 53</span></a> <span class="n">alias_</span> <span class="o">=</span> <span class="n">next_alias_name</span><span class="p">()</span> -</span><span id="L-54"><a href="#L-54"><span class="linenos"> 54</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">alias_</span><span class="p">)))</span> -</span><span id="L-55"><a href="#L-55"><span class="linenos"> 55</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">rename_source</span><span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">alias_</span><span class="p">)</span> -</span><span id="L-56"><a href="#L-56"><span class="linenos"> 56</span></a> -</span><span id="L-57"><a href="#L-57"><span class="linenos"> 57</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">derived_table</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">"pivots"</span><span class="p">)</span> -</span><span id="L-58"><a href="#L-58"><span class="linenos"> 58</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> -</span><span id="L-59"><a href="#L-59"><span class="linenos"> 59</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())))</span> -</span><span id="L-60"><a href="#L-60"><span class="linenos"> 60</span></a> -</span><span id="L-61"><a href="#L-61"><span class="linenos"> 61</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> -</span><span id="L-62"><a href="#L-62"><span class="linenos"> 62</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> -</span><span id="L-63"><a href="#L-63"><span class="linenos"> 63</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Identifier</span><span class="p">):</span> -</span><span id="L-64"><a href="#L-64"><span class="linenos"> 64</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"db"</span><span class="p">):</span> -</span><span id="L-65"><a href="#L-65"><span class="linenos"> 65</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"db"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">db</span><span class="p">))</span> -</span><span id="L-66"><a href="#L-66"><span class="linenos"> 66</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"catalog"</span><span class="p">):</span> -</span><span id="L-67"><a href="#L-67"><span class="linenos"> 67</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"catalog"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">catalog</span><span class="p">))</span> -</span><span id="L-68"><a href="#L-68"><span class="linenos"> 68</span></a> -</span><span id="L-69"><a href="#L-69"><span class="linenos"> 69</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> -</span><span id="L-70"><a href="#L-70"><span class="linenos"> 70</span></a> <span class="n">source</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span> -</span><span id="L-71"><a href="#L-71"><span class="linenos"> 71</span></a> <span class="n">alias</span><span class="p">(</span> -</span><span id="L-72"><a href="#L-72"><span class="linenos"> 72</span></a> <span class="n">source</span><span class="p">,</span> -</span><span id="L-73"><a href="#L-73"><span class="linenos"> 73</span></a> <span class="n">name</span> <span class="ow">or</span> <span class="n">source</span><span class="o">.</span><span class="n">name</span> <span class="ow">or</span> <span class="n">next_alias_name</span><span class="p">(),</span> -</span><span id="L-74"><a href="#L-74"><span class="linenos"> 74</span></a> <span class="n">copy</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> -</span><span id="L-75"><a href="#L-75"><span class="linenos"> 75</span></a> <span class="n">table</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> -</span><span id="L-76"><a href="#L-76"><span class="linenos"> 76</span></a> <span class="p">)</span> -</span><span id="L-77"><a href="#L-77"><span class="linenos"> 77</span></a> <span class="p">)</span> -</span><span id="L-78"><a href="#L-78"><span class="linenos"> 78</span></a> -</span><span id="L-79"><a href="#L-79"><span class="linenos"> 79</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">source</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">"pivots"</span><span class="p">)</span> -</span><span id="L-80"><a href="#L-80"><span class="linenos"> 80</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> -</span><span id="L-81"><a href="#L-81"><span class="linenos"> 81</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> -</span><span id="L-82"><a href="#L-82"><span class="linenos"> 82</span></a> <span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> -</span><span id="L-83"><a href="#L-83"><span class="linenos"> 83</span></a> <span class="p">)</span> -</span><span id="L-84"><a href="#L-84"><span class="linenos"> 84</span></a> -</span><span id="L-85"><a href="#L-85"><span class="linenos"> 85</span></a> <span class="k">if</span> <span class="n">schema</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">ReadCSV</span><span class="p">):</span> -</span><span id="L-86"><a href="#L-86"><span class="linenos"> 86</span></a> <span class="k">with</span> <span class="n">csv_reader</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">)</span> <span class="k">as</span> <span class="n">reader</span><span class="p">:</span> -</span><span id="L-87"><a href="#L-87"><span class="linenos"> 87</span></a> <span class="n">header</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> -</span><span id="L-88"><a href="#L-88"><span class="linenos"> 88</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> -</span><span id="L-89"><a href="#L-89"><span class="linenos"> 89</span></a> <span class="n">schema</span><span class="o">.</span><span class="n">add_table</span><span class="p">(</span> -</span><span id="L-90"><a href="#L-90"><span class="linenos"> 90</span></a> <span class="n">source</span><span class="p">,</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">type</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">header</span><span class="p">,</span> <span class="n">columns</span><span class="p">)}</span> -</span><span id="L-91"><a href="#L-91"><span class="linenos"> 91</span></a> <span class="p">)</span> -</span><span id="L-92"><a href="#L-92"><span class="linenos"> 92</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">source</span><span class="o">.</span><span class="n">is_udtf</span><span class="p">:</span> -</span><span id="L-93"><a href="#L-93"><span class="linenos"> 93</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span> -</span><span id="L-94"><a href="#L-94"><span class="linenos"> 94</span></a> <span class="n">table_alias</span> <span class="o">=</span> <span class="n">udtf</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 class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span> -</span><span id="L-95"><a href="#L-95"><span class="linenos"> 95</span></a> <span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())</span> -</span><span id="L-96"><a href="#L-96"><span class="linenos"> 96</span></a> <span class="p">)</span> -</span><span id="L-97"><a href="#L-97"><span class="linenos"> 97</span></a> <span class="n">udtf</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">table_alias</span><span class="p">)</span> -</span><span id="L-98"><a href="#L-98"><span class="linenos"> 98</span></a> -</span><span id="L-99"><a href="#L-99"><span class="linenos"> 99</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> -</span><span id="L-100"><a href="#L-100"><span class="linenos">100</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> -</span><span id="L-101"><a href="#L-101"><span class="linenos">101</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">udtf</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Values</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> -</span><span id="L-102"><a href="#L-102"><span class="linenos">102</span></a> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">e</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">udtf</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">expressions</span><span class="p">):</span> -</span><span id="L-103"><a href="#L-103"><span class="linenos">103</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">"columns"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="sa">f</span><span class="s2">"_col_</span><span class="si">{</span><span class="n">i</span><span class="si">}</span><span class="s2">"</span><span class="p">))</span> -</span><span id="L-104"><a href="#L-104"><span class="linenos">104</span></a> -</span><span id="L-105"><a href="#L-105"><span class="linenos">105</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos"> 1</span></a><span class="kn">import</span> <span class="nn">itertools</span> +</span><span id="L-2"><a href="#L-2"><span class="linenos"> 2</span></a><span class="kn">import</span> <span class="nn">typing</span> <span class="k">as</span> <span class="nn">t</span> +</span><span id="L-3"><a href="#L-3"><span class="linenos"> 3</span></a> +</span><span id="L-4"><a href="#L-4"><span class="linenos"> 4</span></a><span class="kn">from</span> <span class="nn">sqlglot</span> <span class="kn">import</span> <span class="n">alias</span><span class="p">,</span> <span class="n">exp</span> +</span><span id="L-5"><a href="#L-5"><span class="linenos"> 5</span></a><span class="kn">from</span> <span class="nn">sqlglot._typing</span> <span class="kn">import</span> <span class="n">E</span> +</span><span id="L-6"><a href="#L-6"><span class="linenos"> 6</span></a><span class="kn">from</span> <span class="nn">sqlglot.helper</span> <span class="kn">import</span> <span class="n">csv_reader</span><span class="p">,</span> <span class="n">name_sequence</span> +</span><span id="L-7"><a href="#L-7"><span class="linenos"> 7</span></a><span class="kn">from</span> <span class="nn">sqlglot.optimizer.scope</span> <span class="kn">import</span> <span class="n">Scope</span><span class="p">,</span> <span class="n">traverse_scope</span> +</span><span id="L-8"><a href="#L-8"><span class="linenos"> 8</span></a><span class="kn">from</span> <span class="nn">sqlglot.schema</span> <span class="kn">import</span> <span class="n">Schema</span> +</span><span id="L-9"><a href="#L-9"><span class="linenos"> 9</span></a> +</span><span id="L-10"><a href="#L-10"><span class="linenos">10</span></a> +</span><span id="L-11"><a href="#L-11"><span class="linenos">11</span></a><span class="k">def</span> <span class="nf">qualify_tables</span><span class="p">(</span> +</span><span id="L-12"><a href="#L-12"><span class="linenos">12</span></a> <span class="n">expression</span><span class="p">:</span> <span class="n">E</span><span class="p">,</span> +</span><span id="L-13"><a href="#L-13"><span class="linenos">13</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> +</span><span id="L-14"><a href="#L-14"><span class="linenos">14</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> +</span><span id="L-15"><a href="#L-15"><span class="linenos">15</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> +</span><span id="L-16"><a href="#L-16"><span class="linenos">16</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">E</span><span class="p">:</span> +</span><span id="L-17"><a href="#L-17"><span class="linenos">17</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="L-18"><a href="#L-18"><span class="linenos">18</span></a><span class="sd"> Rewrite sqlglot AST to have fully qualified tables. Join constructs such as</span> +</span><span id="L-19"><a href="#L-19"><span class="linenos">19</span></a><span class="sd"> (t1 JOIN t2) AS t will be expanded into (SELECT * FROM t1 AS t1, t2 AS t2) AS t.</span> +</span><span id="L-20"><a href="#L-20"><span class="linenos">20</span></a> +</span><span id="L-21"><a href="#L-21"><span class="linenos">21</span></a><span class="sd"> Examples:</span> +</span><span id="L-22"><a href="#L-22"><span class="linenos">22</span></a><span class="sd"> >>> import sqlglot</span> +</span><span id="L-23"><a href="#L-23"><span class="linenos">23</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT 1 FROM tbl")</span> +</span><span id="L-24"><a href="#L-24"><span class="linenos">24</span></a><span class="sd"> >>> qualify_tables(expression, db="db").sql()</span> +</span><span id="L-25"><a href="#L-25"><span class="linenos">25</span></a><span class="sd"> 'SELECT 1 FROM db.tbl AS tbl'</span> +</span><span id="L-26"><a href="#L-26"><span class="linenos">26</span></a><span class="sd"> >>></span> +</span><span id="L-27"><a href="#L-27"><span class="linenos">27</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT 1 FROM (t1 JOIN t2) AS t")</span> +</span><span id="L-28"><a href="#L-28"><span class="linenos">28</span></a><span class="sd"> >>> qualify_tables(expression).sql()</span> +</span><span id="L-29"><a href="#L-29"><span class="linenos">29</span></a><span class="sd"> 'SELECT 1 FROM (SELECT * FROM t1 AS t1, t2 AS t2) AS t'</span> +</span><span id="L-30"><a href="#L-30"><span class="linenos">30</span></a> +</span><span id="L-31"><a href="#L-31"><span class="linenos">31</span></a><span class="sd"> Args:</span> +</span><span id="L-32"><a href="#L-32"><span class="linenos">32</span></a><span class="sd"> expression: Expression to qualify</span> +</span><span id="L-33"><a href="#L-33"><span class="linenos">33</span></a><span class="sd"> db: Database name</span> +</span><span id="L-34"><a href="#L-34"><span class="linenos">34</span></a><span class="sd"> catalog: Catalog name</span> +</span><span id="L-35"><a href="#L-35"><span class="linenos">35</span></a><span class="sd"> schema: A schema to populate</span> +</span><span id="L-36"><a href="#L-36"><span class="linenos">36</span></a> +</span><span id="L-37"><a href="#L-37"><span class="linenos">37</span></a><span class="sd"> Returns:</span> +</span><span id="L-38"><a href="#L-38"><span class="linenos">38</span></a><span class="sd"> The qualified expression.</span> +</span><span id="L-39"><a href="#L-39"><span class="linenos">39</span></a><span class="sd"> """</span> +</span><span id="L-40"><a href="#L-40"><span class="linenos">40</span></a> <span class="n">next_alias_name</span> <span class="o">=</span> <span class="n">name_sequence</span><span class="p">(</span><span class="s2">"_q_"</span><span class="p">)</span> +</span><span id="L-41"><a href="#L-41"><span class="linenos">41</span></a> +</span><span id="L-42"><a href="#L-42"><span class="linenos">42</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="L-43"><a href="#L-43"><span class="linenos">43</span></a> <span class="k">for</span> <span class="n">derived_table</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">ctes</span><span class="p">,</span> <span class="n">scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">):</span> +</span><span id="L-44"><a href="#L-44"><span class="linenos">44</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">derived_table</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span> +</span><span id="L-45"><a href="#L-45"><span class="linenos">45</span></a> <span class="n">unnested</span> <span class="o">=</span> <span class="n">derived_table</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span> +</span><span id="L-46"><a href="#L-46"><span class="linenos">46</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnested</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> +</span><span id="L-47"><a href="#L-47"><span class="linenos">47</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">unnested</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> +</span><span id="L-48"><a href="#L-48"><span class="linenos">48</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">this</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">select</span><span class="p">(</span><span class="s2">"*"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnested</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-49"><a href="#L-49"><span class="linenos">49</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="n">joins</span><span class="p">)</span> +</span><span id="L-50"><a href="#L-50"><span class="linenos">50</span></a> +</span><span id="L-51"><a href="#L-51"><span class="linenos">51</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">derived_table</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-52"><a href="#L-52"><span class="linenos">52</span></a> <span class="n">alias_</span> <span class="o">=</span> <span class="n">next_alias_name</span><span class="p">()</span> +</span><span id="L-53"><a href="#L-53"><span class="linenos">53</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">alias_</span><span class="p">)))</span> +</span><span id="L-54"><a href="#L-54"><span class="linenos">54</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">rename_source</span><span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">alias_</span><span class="p">)</span> +</span><span id="L-55"><a href="#L-55"><span class="linenos">55</span></a> +</span><span id="L-56"><a href="#L-56"><span class="linenos">56</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">derived_table</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">"pivots"</span><span class="p">)</span> +</span><span id="L-57"><a href="#L-57"><span class="linenos">57</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> +</span><span id="L-58"><a href="#L-58"><span class="linenos">58</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())))</span> +</span><span id="L-59"><a href="#L-59"><span class="linenos">59</span></a> +</span><span id="L-60"><a href="#L-60"><span class="linenos">60</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> +</span><span id="L-61"><a href="#L-61"><span class="linenos">61</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> +</span><span id="L-62"><a href="#L-62"><span class="linenos">62</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Identifier</span><span class="p">):</span> +</span><span id="L-63"><a href="#L-63"><span class="linenos">63</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"db"</span><span class="p">):</span> +</span><span id="L-64"><a href="#L-64"><span class="linenos">64</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"db"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">db</span><span class="p">))</span> +</span><span id="L-65"><a href="#L-65"><span class="linenos">65</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"catalog"</span><span class="p">):</span> +</span><span id="L-66"><a href="#L-66"><span class="linenos">66</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"catalog"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">catalog</span><span class="p">))</span> +</span><span id="L-67"><a href="#L-67"><span class="linenos">67</span></a> +</span><span id="L-68"><a href="#L-68"><span class="linenos">68</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> +</span><span id="L-69"><a href="#L-69"><span class="linenos">69</span></a> <span class="c1"># Mutates the source by attaching an alias to it</span> +</span><span id="L-70"><a href="#L-70"><span class="linenos">70</span></a> <span class="n">alias</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">name</span> <span class="ow">or</span> <span class="n">source</span><span class="o">.</span><span class="n">name</span> <span class="ow">or</span> <span class="n">next_alias_name</span><span class="p">(),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span> +</span><span id="L-71"><a href="#L-71"><span class="linenos">71</span></a> +</span><span id="L-72"><a href="#L-72"><span class="linenos">72</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">source</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">"pivots"</span><span class="p">)</span> +</span><span id="L-73"><a href="#L-73"><span class="linenos">73</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> +</span><span id="L-74"><a href="#L-74"><span class="linenos">74</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> +</span><span id="L-75"><a href="#L-75"><span class="linenos">75</span></a> <span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> +</span><span id="L-76"><a href="#L-76"><span class="linenos">76</span></a> <span class="p">)</span> +</span><span id="L-77"><a href="#L-77"><span class="linenos">77</span></a> +</span><span id="L-78"><a href="#L-78"><span class="linenos">78</span></a> <span class="k">if</span> <span class="n">schema</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">ReadCSV</span><span class="p">):</span> +</span><span id="L-79"><a href="#L-79"><span class="linenos">79</span></a> <span class="k">with</span> <span class="n">csv_reader</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">)</span> <span class="k">as</span> <span class="n">reader</span><span class="p">:</span> +</span><span id="L-80"><a href="#L-80"><span class="linenos">80</span></a> <span class="n">header</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> +</span><span id="L-81"><a href="#L-81"><span class="linenos">81</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> +</span><span id="L-82"><a href="#L-82"><span class="linenos">82</span></a> <span class="n">schema</span><span class="o">.</span><span class="n">add_table</span><span class="p">(</span> +</span><span id="L-83"><a href="#L-83"><span class="linenos">83</span></a> <span class="n">source</span><span class="p">,</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">type</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">header</span><span class="p">,</span> <span class="n">columns</span><span class="p">)}</span> +</span><span id="L-84"><a href="#L-84"><span class="linenos">84</span></a> <span class="p">)</span> +</span><span id="L-85"><a href="#L-85"><span class="linenos">85</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">source</span><span class="o">.</span><span class="n">is_udtf</span><span class="p">:</span> +</span><span id="L-86"><a href="#L-86"><span class="linenos">86</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span> +</span><span id="L-87"><a href="#L-87"><span class="linenos">87</span></a> <span class="n">table_alias</span> <span class="o">=</span> <span class="n">udtf</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 class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span> +</span><span id="L-88"><a href="#L-88"><span class="linenos">88</span></a> <span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())</span> +</span><span id="L-89"><a href="#L-89"><span class="linenos">89</span></a> <span class="p">)</span> +</span><span id="L-90"><a href="#L-90"><span class="linenos">90</span></a> <span class="n">udtf</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">table_alias</span><span class="p">)</span> +</span><span id="L-91"><a href="#L-91"><span class="linenos">91</span></a> +</span><span id="L-92"><a href="#L-92"><span class="linenos">92</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> +</span><span id="L-93"><a href="#L-93"><span class="linenos">93</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> +</span><span id="L-94"><a href="#L-94"><span class="linenos">94</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">udtf</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Values</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> +</span><span id="L-95"><a href="#L-95"><span class="linenos">95</span></a> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">e</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">udtf</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">expressions</span><span class="p">):</span> +</span><span id="L-96"><a href="#L-96"><span class="linenos">96</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">"columns"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="sa">f</span><span class="s2">"_col_</span><span class="si">{</span><span class="n">i</span><span class="si">}</span><span class="s2">"</span><span class="p">))</span> +</span><span id="L-97"><a href="#L-97"><span class="linenos">97</span></a> +</span><span id="L-98"><a href="#L-98"><span class="linenos">98</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> @@ -176,106 +169,99 @@ </div> <a class="headerlink" href="#qualify_tables"></a> - <div class="pdoc-code codehilite"><pre><span></span><span id="qualify_tables-12"><a href="#qualify_tables-12"><span class="linenos"> 12</span></a><span class="k">def</span> <span class="nf">qualify_tables</span><span class="p">(</span> -</span><span id="qualify_tables-13"><a href="#qualify_tables-13"><span class="linenos"> 13</span></a> <span class="n">expression</span><span class="p">:</span> <span class="n">E</span><span class="p">,</span> -</span><span id="qualify_tables-14"><a href="#qualify_tables-14"><span class="linenos"> 14</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> -</span><span id="qualify_tables-15"><a href="#qualify_tables-15"><span class="linenos"> 15</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> -</span><span id="qualify_tables-16"><a href="#qualify_tables-16"><span class="linenos"> 16</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> -</span><span id="qualify_tables-17"><a href="#qualify_tables-17"><span class="linenos"> 17</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">E</span><span class="p">:</span> -</span><span id="qualify_tables-18"><a href="#qualify_tables-18"><span class="linenos"> 18</span></a><span class="w"> </span><span class="sd">"""</span> -</span><span id="qualify_tables-19"><a href="#qualify_tables-19"><span class="linenos"> 19</span></a><span class="sd"> Rewrite sqlglot AST to have fully qualified tables. Additionally, this</span> -</span><span id="qualify_tables-20"><a href="#qualify_tables-20"><span class="linenos"> 20</span></a><span class="sd"> replaces "join constructs" (*) by equivalent SELECT * subqueries.</span> -</span><span id="qualify_tables-21"><a href="#qualify_tables-21"><span class="linenos"> 21</span></a> -</span><span id="qualify_tables-22"><a href="#qualify_tables-22"><span class="linenos"> 22</span></a><span class="sd"> Examples:</span> -</span><span id="qualify_tables-23"><a href="#qualify_tables-23"><span class="linenos"> 23</span></a><span class="sd"> >>> import sqlglot</span> -</span><span id="qualify_tables-24"><a href="#qualify_tables-24"><span class="linenos"> 24</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT 1 FROM tbl")</span> -</span><span id="qualify_tables-25"><a href="#qualify_tables-25"><span class="linenos"> 25</span></a><span class="sd"> >>> qualify_tables(expression, db="db").sql()</span> -</span><span id="qualify_tables-26"><a href="#qualify_tables-26"><span class="linenos"> 26</span></a><span class="sd"> 'SELECT 1 FROM db.tbl AS tbl'</span> -</span><span id="qualify_tables-27"><a href="#qualify_tables-27"><span class="linenos"> 27</span></a><span class="sd"> >>></span> -</span><span id="qualify_tables-28"><a href="#qualify_tables-28"><span class="linenos"> 28</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT * FROM (tbl1 JOIN tbl2 ON id1 = id2)")</span> -</span><span id="qualify_tables-29"><a href="#qualify_tables-29"><span class="linenos"> 29</span></a><span class="sd"> >>> qualify_tables(expression).sql()</span> -</span><span id="qualify_tables-30"><a href="#qualify_tables-30"><span class="linenos"> 30</span></a><span class="sd"> 'SELECT * FROM (SELECT * FROM tbl1 AS tbl1 JOIN tbl2 AS tbl2 ON id1 = id2) AS _q_0'</span> -</span><span id="qualify_tables-31"><a href="#qualify_tables-31"><span class="linenos"> 31</span></a> -</span><span id="qualify_tables-32"><a href="#qualify_tables-32"><span class="linenos"> 32</span></a><span class="sd"> Args:</span> -</span><span id="qualify_tables-33"><a href="#qualify_tables-33"><span class="linenos"> 33</span></a><span class="sd"> expression: Expression to qualify</span> -</span><span id="qualify_tables-34"><a href="#qualify_tables-34"><span class="linenos"> 34</span></a><span class="sd"> db: Database name</span> -</span><span id="qualify_tables-35"><a href="#qualify_tables-35"><span class="linenos"> 35</span></a><span class="sd"> catalog: Catalog name</span> -</span><span id="qualify_tables-36"><a href="#qualify_tables-36"><span class="linenos"> 36</span></a><span class="sd"> schema: A schema to populate</span> -</span><span id="qualify_tables-37"><a href="#qualify_tables-37"><span class="linenos"> 37</span></a> -</span><span id="qualify_tables-38"><a href="#qualify_tables-38"><span class="linenos"> 38</span></a><span class="sd"> Returns:</span> -</span><span id="qualify_tables-39"><a href="#qualify_tables-39"><span class="linenos"> 39</span></a><span class="sd"> The qualified expression.</span> -</span><span id="qualify_tables-40"><a href="#qualify_tables-40"><span class="linenos"> 40</span></a> -</span><span id="qualify_tables-41"><a href="#qualify_tables-41"><span class="linenos"> 41</span></a><span class="sd"> (*) See section 7.2.1.2 in https://www.postgresql.org/docs/current/queries-table-expressions.html</span> -</span><span id="qualify_tables-42"><a href="#qualify_tables-42"><span class="linenos"> 42</span></a><span class="sd"> """</span> -</span><span id="qualify_tables-43"><a href="#qualify_tables-43"><span class="linenos"> 43</span></a> <span class="n">next_alias_name</span> <span class="o">=</span> <span class="n">name_sequence</span><span class="p">(</span><span class="s2">"_q_"</span><span class="p">)</span> -</span><span id="qualify_tables-44"><a href="#qualify_tables-44"><span class="linenos"> 44</span></a> -</span><span id="qualify_tables-45"><a href="#qualify_tables-45"><span class="linenos"> 45</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> -</span><span id="qualify_tables-46"><a href="#qualify_tables-46"><span class="linenos"> 46</span></a> <span class="k">for</span> <span class="n">derived_table</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">ctes</span><span class="p">,</span> <span class="n">scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">):</span> -</span><span id="qualify_tables-47"><a href="#qualify_tables-47"><span class="linenos"> 47</span></a> <span class="c1"># Expand join construct</span> -</span><span id="qualify_tables-48"><a href="#qualify_tables-48"><span class="linenos"> 48</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">derived_table</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span> -</span><span id="qualify_tables-49"><a href="#qualify_tables-49"><span class="linenos"> 49</span></a> <span class="n">unnested</span> <span class="o">=</span> <span class="n">derived_table</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span> -</span><span id="qualify_tables-50"><a href="#qualify_tables-50"><span class="linenos"> 50</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnested</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> -</span><span id="qualify_tables-51"><a href="#qualify_tables-51"><span class="linenos"> 51</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">this</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">select</span><span class="p">(</span><span class="s2">"*"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnested</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="qualify_tables-52"><a href="#qualify_tables-52"><span class="linenos"> 52</span></a> -</span><span id="qualify_tables-53"><a href="#qualify_tables-53"><span class="linenos"> 53</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">derived_table</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="qualify_tables-54"><a href="#qualify_tables-54"><span class="linenos"> 54</span></a> <span class="n">alias_</span> <span class="o">=</span> <span class="n">next_alias_name</span><span class="p">()</span> -</span><span id="qualify_tables-55"><a href="#qualify_tables-55"><span class="linenos"> 55</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">alias_</span><span class="p">)))</span> -</span><span id="qualify_tables-56"><a href="#qualify_tables-56"><span class="linenos"> 56</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">rename_source</span><span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">alias_</span><span class="p">)</span> -</span><span id="qualify_tables-57"><a href="#qualify_tables-57"><span class="linenos"> 57</span></a> -</span><span id="qualify_tables-58"><a href="#qualify_tables-58"><span class="linenos"> 58</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">derived_table</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">"pivots"</span><span class="p">)</span> -</span><span id="qualify_tables-59"><a href="#qualify_tables-59"><span class="linenos"> 59</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> -</span><span id="qualify_tables-60"><a href="#qualify_tables-60"><span class="linenos"> 60</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())))</span> -</span><span id="qualify_tables-61"><a href="#qualify_tables-61"><span class="linenos"> 61</span></a> -</span><span id="qualify_tables-62"><a href="#qualify_tables-62"><span class="linenos"> 62</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> -</span><span id="qualify_tables-63"><a href="#qualify_tables-63"><span class="linenos"> 63</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> -</span><span id="qualify_tables-64"><a href="#qualify_tables-64"><span class="linenos"> 64</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Identifier</span><span class="p">):</span> -</span><span id="qualify_tables-65"><a href="#qualify_tables-65"><span class="linenos"> 65</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"db"</span><span class="p">):</span> -</span><span id="qualify_tables-66"><a href="#qualify_tables-66"><span class="linenos"> 66</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"db"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">db</span><span class="p">))</span> -</span><span id="qualify_tables-67"><a href="#qualify_tables-67"><span class="linenos"> 67</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"catalog"</span><span class="p">):</span> -</span><span id="qualify_tables-68"><a href="#qualify_tables-68"><span class="linenos"> 68</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"catalog"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">catalog</span><span class="p">))</span> -</span><span id="qualify_tables-69"><a href="#qualify_tables-69"><span class="linenos"> 69</span></a> -</span><span id="qualify_tables-70"><a href="#qualify_tables-70"><span class="linenos"> 70</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> -</span><span id="qualify_tables-71"><a href="#qualify_tables-71"><span class="linenos"> 71</span></a> <span class="n">source</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span> -</span><span id="qualify_tables-72"><a href="#qualify_tables-72"><span class="linenos"> 72</span></a> <span class="n">alias</span><span class="p">(</span> -</span><span id="qualify_tables-73"><a href="#qualify_tables-73"><span class="linenos"> 73</span></a> <span class="n">source</span><span class="p">,</span> -</span><span id="qualify_tables-74"><a href="#qualify_tables-74"><span class="linenos"> 74</span></a> <span class="n">name</span> <span class="ow">or</span> <span class="n">source</span><span class="o">.</span><span class="n">name</span> <span class="ow">or</span> <span class="n">next_alias_name</span><span class="p">(),</span> -</span><span id="qualify_tables-75"><a href="#qualify_tables-75"><span class="linenos"> 75</span></a> <span class="n">copy</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> -</span><span id="qualify_tables-76"><a href="#qualify_tables-76"><span class="linenos"> 76</span></a> <span class="n">table</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> -</span><span id="qualify_tables-77"><a href="#qualify_tables-77"><span class="linenos"> 77</span></a> <span class="p">)</span> -</span><span id="qualify_tables-78"><a href="#qualify_tables-78"><span class="linenos"> 78</span></a> <span class="p">)</span> -</span><span id="qualify_tables-79"><a href="#qualify_tables-79"><span class="linenos"> 79</span></a> -</span><span id="qualify_tables-80"><a href="#qualify_tables-80"><span class="linenos"> 80</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">source</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">"pivots"</span><span class="p">)</span> -</span><span id="qualify_tables-81"><a href="#qualify_tables-81"><span class="linenos"> 81</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> -</span><span id="qualify_tables-82"><a href="#qualify_tables-82"><span class="linenos"> 82</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> -</span><span id="qualify_tables-83"><a href="#qualify_tables-83"><span class="linenos"> 83</span></a> <span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> -</span><span id="qualify_tables-84"><a href="#qualify_tables-84"><span class="linenos"> 84</span></a> <span class="p">)</span> -</span><span id="qualify_tables-85"><a href="#qualify_tables-85"><span class="linenos"> 85</span></a> -</span><span id="qualify_tables-86"><a href="#qualify_tables-86"><span class="linenos"> 86</span></a> <span class="k">if</span> <span class="n">schema</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">ReadCSV</span><span class="p">):</span> -</span><span id="qualify_tables-87"><a href="#qualify_tables-87"><span class="linenos"> 87</span></a> <span class="k">with</span> <span class="n">csv_reader</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">)</span> <span class="k">as</span> <span class="n">reader</span><span class="p">:</span> -</span><span id="qualify_tables-88"><a href="#qualify_tables-88"><span class="linenos"> 88</span></a> <span class="n">header</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> -</span><span id="qualify_tables-89"><a href="#qualify_tables-89"><span class="linenos"> 89</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> -</span><span id="qualify_tables-90"><a href="#qualify_tables-90"><span class="linenos"> 90</span></a> <span class="n">schema</span><span class="o">.</span><span class="n">add_table</span><span class="p">(</span> -</span><span id="qualify_tables-91"><a href="#qualify_tables-91"><span class="linenos"> 91</span></a> <span class="n">source</span><span class="p">,</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">type</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">header</span><span class="p">,</span> <span class="n">columns</span><span class="p">)}</span> -</span><span id="qualify_tables-92"><a href="#qualify_tables-92"><span class="linenos"> 92</span></a> <span class="p">)</span> -</span><span id="qualify_tables-93"><a href="#qualify_tables-93"><span class="linenos"> 93</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">source</span><span class="o">.</span><span class="n">is_udtf</span><span class="p">:</span> -</span><span id="qualify_tables-94"><a href="#qualify_tables-94"><span class="linenos"> 94</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span> -</span><span id="qualify_tables-95"><a href="#qualify_tables-95"><span class="linenos"> 95</span></a> <span class="n">table_alias</span> <span class="o">=</span> <span class="n">udtf</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 class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span> -</span><span id="qualify_tables-96"><a href="#qualify_tables-96"><span class="linenos"> 96</span></a> <span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())</span> -</span><span id="qualify_tables-97"><a href="#qualify_tables-97"><span class="linenos"> 97</span></a> <span class="p">)</span> -</span><span id="qualify_tables-98"><a href="#qualify_tables-98"><span class="linenos"> 98</span></a> <span class="n">udtf</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">table_alias</span><span class="p">)</span> -</span><span id="qualify_tables-99"><a href="#qualify_tables-99"><span class="linenos"> 99</span></a> -</span><span id="qualify_tables-100"><a href="#qualify_tables-100"><span class="linenos">100</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> -</span><span id="qualify_tables-101"><a href="#qualify_tables-101"><span class="linenos">101</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> -</span><span id="qualify_tables-102"><a href="#qualify_tables-102"><span class="linenos">102</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">udtf</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Values</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> -</span><span id="qualify_tables-103"><a href="#qualify_tables-103"><span class="linenos">103</span></a> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">e</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">udtf</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">expressions</span><span class="p">):</span> -</span><span id="qualify_tables-104"><a href="#qualify_tables-104"><span class="linenos">104</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">"columns"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="sa">f</span><span class="s2">"_col_</span><span class="si">{</span><span class="n">i</span><span class="si">}</span><span class="s2">"</span><span class="p">))</span> -</span><span id="qualify_tables-105"><a href="#qualify_tables-105"><span class="linenos">105</span></a> -</span><span id="qualify_tables-106"><a href="#qualify_tables-106"><span class="linenos">106</span></a> <span class="k">return</span> <span class="n">expression</span> + <div class="pdoc-code codehilite"><pre><span></span><span id="qualify_tables-12"><a href="#qualify_tables-12"><span class="linenos">12</span></a><span class="k">def</span> <span class="nf">qualify_tables</span><span class="p">(</span> +</span><span id="qualify_tables-13"><a href="#qualify_tables-13"><span class="linenos">13</span></a> <span class="n">expression</span><span class="p">:</span> <span class="n">E</span><span class="p">,</span> +</span><span id="qualify_tables-14"><a href="#qualify_tables-14"><span class="linenos">14</span></a> <span class="n">db</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> +</span><span id="qualify_tables-15"><a href="#qualify_tables-15"><span class="linenos">15</span></a> <span class="n">catalog</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> +</span><span id="qualify_tables-16"><a href="#qualify_tables-16"><span class="linenos">16</span></a> <span class="n">schema</span><span class="p">:</span> <span class="n">t</span><span class="o">.</span><span class="n">Optional</span><span class="p">[</span><span class="n">Schema</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> +</span><span id="qualify_tables-17"><a href="#qualify_tables-17"><span class="linenos">17</span></a><span class="p">)</span> <span class="o">-></span> <span class="n">E</span><span class="p">:</span> +</span><span id="qualify_tables-18"><a href="#qualify_tables-18"><span class="linenos">18</span></a><span class="w"> </span><span class="sd">"""</span> +</span><span id="qualify_tables-19"><a href="#qualify_tables-19"><span class="linenos">19</span></a><span class="sd"> Rewrite sqlglot AST to have fully qualified tables. Join constructs such as</span> +</span><span id="qualify_tables-20"><a href="#qualify_tables-20"><span class="linenos">20</span></a><span class="sd"> (t1 JOIN t2) AS t will be expanded into (SELECT * FROM t1 AS t1, t2 AS t2) AS t.</span> +</span><span id="qualify_tables-21"><a href="#qualify_tables-21"><span class="linenos">21</span></a> +</span><span id="qualify_tables-22"><a href="#qualify_tables-22"><span class="linenos">22</span></a><span class="sd"> Examples:</span> +</span><span id="qualify_tables-23"><a href="#qualify_tables-23"><span class="linenos">23</span></a><span class="sd"> >>> import sqlglot</span> +</span><span id="qualify_tables-24"><a href="#qualify_tables-24"><span class="linenos">24</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT 1 FROM tbl")</span> +</span><span id="qualify_tables-25"><a href="#qualify_tables-25"><span class="linenos">25</span></a><span class="sd"> >>> qualify_tables(expression, db="db").sql()</span> +</span><span id="qualify_tables-26"><a href="#qualify_tables-26"><span class="linenos">26</span></a><span class="sd"> 'SELECT 1 FROM db.tbl AS tbl'</span> +</span><span id="qualify_tables-27"><a href="#qualify_tables-27"><span class="linenos">27</span></a><span class="sd"> >>></span> +</span><span id="qualify_tables-28"><a href="#qualify_tables-28"><span class="linenos">28</span></a><span class="sd"> >>> expression = sqlglot.parse_one("SELECT 1 FROM (t1 JOIN t2) AS t")</span> +</span><span id="qualify_tables-29"><a href="#qualify_tables-29"><span class="linenos">29</span></a><span class="sd"> >>> qualify_tables(expression).sql()</span> +</span><span id="qualify_tables-30"><a href="#qualify_tables-30"><span class="linenos">30</span></a><span class="sd"> 'SELECT 1 FROM (SELECT * FROM t1 AS t1, t2 AS t2) AS t'</span> +</span><span id="qualify_tables-31"><a href="#qualify_tables-31"><span class="linenos">31</span></a> +</span><span id="qualify_tables-32"><a href="#qualify_tables-32"><span class="linenos">32</span></a><span class="sd"> Args:</span> +</span><span id="qualify_tables-33"><a href="#qualify_tables-33"><span class="linenos">33</span></a><span class="sd"> expression: Expression to qualify</span> +</span><span id="qualify_tables-34"><a href="#qualify_tables-34"><span class="linenos">34</span></a><span class="sd"> db: Database name</span> +</span><span id="qualify_tables-35"><a href="#qualify_tables-35"><span class="linenos">35</span></a><span class="sd"> catalog: Catalog name</span> +</span><span id="qualify_tables-36"><a href="#qualify_tables-36"><span class="linenos">36</span></a><span class="sd"> schema: A schema to populate</span> +</span><span id="qualify_tables-37"><a href="#qualify_tables-37"><span class="linenos">37</span></a> +</span><span id="qualify_tables-38"><a href="#qualify_tables-38"><span class="linenos">38</span></a><span class="sd"> Returns:</span> +</span><span id="qualify_tables-39"><a href="#qualify_tables-39"><span class="linenos">39</span></a><span class="sd"> The qualified expression.</span> +</span><span id="qualify_tables-40"><a href="#qualify_tables-40"><span class="linenos">40</span></a><span class="sd"> """</span> +</span><span id="qualify_tables-41"><a href="#qualify_tables-41"><span class="linenos">41</span></a> <span class="n">next_alias_name</span> <span class="o">=</span> <span class="n">name_sequence</span><span class="p">(</span><span class="s2">"_q_"</span><span class="p">)</span> +</span><span id="qualify_tables-42"><a href="#qualify_tables-42"><span class="linenos">42</span></a> +</span><span id="qualify_tables-43"><a href="#qualify_tables-43"><span class="linenos">43</span></a> <span class="k">for</span> <span class="n">scope</span> <span class="ow">in</span> <span class="n">traverse_scope</span><span class="p">(</span><span class="n">expression</span><span class="p">):</span> +</span><span id="qualify_tables-44"><a href="#qualify_tables-44"><span class="linenos">44</span></a> <span class="k">for</span> <span class="n">derived_table</span> <span class="ow">in</span> <span class="n">itertools</span><span class="o">.</span><span class="n">chain</span><span class="p">(</span><span class="n">scope</span><span class="o">.</span><span class="n">ctes</span><span class="p">,</span> <span class="n">scope</span><span class="o">.</span><span class="n">derived_tables</span><span class="p">):</span> +</span><span id="qualify_tables-45"><a href="#qualify_tables-45"><span class="linenos">45</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">derived_table</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Subquery</span><span class="p">):</span> +</span><span id="qualify_tables-46"><a href="#qualify_tables-46"><span class="linenos">46</span></a> <span class="n">unnested</span> <span class="o">=</span> <span class="n">derived_table</span><span class="o">.</span><span class="n">unnest</span><span class="p">()</span> +</span><span id="qualify_tables-47"><a href="#qualify_tables-47"><span class="linenos">47</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">unnested</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> +</span><span id="qualify_tables-48"><a href="#qualify_tables-48"><span class="linenos">48</span></a> <span class="n">joins</span> <span class="o">=</span> <span class="n">unnested</span><span class="o">.</span><span class="n">args</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> +</span><span id="qualify_tables-49"><a href="#qualify_tables-49"><span class="linenos">49</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">this</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">select</span><span class="p">(</span><span class="s2">"*"</span><span class="p">)</span><span class="o">.</span><span class="n">from_</span><span class="p">(</span><span class="n">unnested</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="qualify_tables-50"><a href="#qualify_tables-50"><span class="linenos">50</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">this</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"joins"</span><span class="p">,</span> <span class="n">joins</span><span class="p">)</span> +</span><span id="qualify_tables-51"><a href="#qualify_tables-51"><span class="linenos">51</span></a> +</span><span id="qualify_tables-52"><a href="#qualify_tables-52"><span class="linenos">52</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">derived_table</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="qualify_tables-53"><a href="#qualify_tables-53"><span class="linenos">53</span></a> <span class="n">alias_</span> <span class="o">=</span> <span class="n">next_alias_name</span><span class="p">()</span> +</span><span id="qualify_tables-54"><a href="#qualify_tables-54"><span class="linenos">54</span></a> <span class="n">derived_table</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">alias_</span><span class="p">)))</span> +</span><span id="qualify_tables-55"><a href="#qualify_tables-55"><span class="linenos">55</span></a> <span class="n">scope</span><span class="o">.</span><span class="n">rename_source</span><span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">alias_</span><span class="p">)</span> +</span><span id="qualify_tables-56"><a href="#qualify_tables-56"><span class="linenos">56</span></a> +</span><span id="qualify_tables-57"><a href="#qualify_tables-57"><span class="linenos">57</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">derived_table</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">"pivots"</span><span class="p">)</span> +</span><span id="qualify_tables-58"><a href="#qualify_tables-58"><span class="linenos">58</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> +</span><span id="qualify_tables-59"><a href="#qualify_tables-59"><span class="linenos">59</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())))</span> +</span><span id="qualify_tables-60"><a href="#qualify_tables-60"><span class="linenos">60</span></a> +</span><span id="qualify_tables-61"><a href="#qualify_tables-61"><span class="linenos">61</span></a> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">source</span> <span class="ow">in</span> <span class="n">scope</span><span class="o">.</span><span class="n">sources</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> +</span><span id="qualify_tables-62"><a href="#qualify_tables-62"><span class="linenos">62</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Table</span><span class="p">):</span> +</span><span id="qualify_tables-63"><a href="#qualify_tables-63"><span class="linenos">63</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Identifier</span><span class="p">):</span> +</span><span id="qualify_tables-64"><a href="#qualify_tables-64"><span class="linenos">64</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"db"</span><span class="p">):</span> +</span><span id="qualify_tables-65"><a href="#qualify_tables-65"><span class="linenos">65</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"db"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">db</span><span class="p">))</span> +</span><span id="qualify_tables-66"><a href="#qualify_tables-66"><span class="linenos">66</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</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">"catalog"</span><span class="p">):</span> +</span><span id="qualify_tables-67"><a href="#qualify_tables-67"><span class="linenos">67</span></a> <span class="n">source</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"catalog"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">catalog</span><span class="p">))</span> +</span><span id="qualify_tables-68"><a href="#qualify_tables-68"><span class="linenos">68</span></a> +</span><span id="qualify_tables-69"><a href="#qualify_tables-69"><span class="linenos">69</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">source</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> +</span><span id="qualify_tables-70"><a href="#qualify_tables-70"><span class="linenos">70</span></a> <span class="c1"># Mutates the source by attaching an alias to it</span> +</span><span id="qualify_tables-71"><a href="#qualify_tables-71"><span class="linenos">71</span></a> <span class="n">alias</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">name</span> <span class="ow">or</span> <span class="n">source</span><span class="o">.</span><span class="n">name</span> <span class="ow">or</span> <span class="n">next_alias_name</span><span class="p">(),</span> <span class="n">copy</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">table</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span> +</span><span id="qualify_tables-72"><a href="#qualify_tables-72"><span class="linenos">72</span></a> +</span><span id="qualify_tables-73"><a href="#qualify_tables-73"><span class="linenos">73</span></a> <span class="n">pivots</span> <span class="o">=</span> <span class="n">source</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">"pivots"</span><span class="p">)</span> +</span><span id="qualify_tables-74"><a href="#qualify_tables-74"><span class="linenos">74</span></a> <span class="k">if</span> <span class="n">pivots</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">alias</span><span class="p">:</span> +</span><span id="qualify_tables-75"><a href="#qualify_tables-75"><span class="linenos">75</span></a> <span class="n">pivots</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">set</span><span class="p">(</span> +</span><span id="qualify_tables-76"><a href="#qualify_tables-76"><span class="linenos">76</span></a> <span class="s2">"alias"</span><span class="p">,</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">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> +</span><span id="qualify_tables-77"><a href="#qualify_tables-77"><span class="linenos">77</span></a> <span class="p">)</span> +</span><span id="qualify_tables-78"><a href="#qualify_tables-78"><span class="linenos">78</span></a> +</span><span id="qualify_tables-79"><a href="#qualify_tables-79"><span class="linenos">79</span></a> <span class="k">if</span> <span class="n">schema</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">ReadCSV</span><span class="p">):</span> +</span><span id="qualify_tables-80"><a href="#qualify_tables-80"><span class="linenos">80</span></a> <span class="k">with</span> <span class="n">csv_reader</span><span class="p">(</span><span class="n">source</span><span class="o">.</span><span class="n">this</span><span class="p">)</span> <span class="k">as</span> <span class="n">reader</span><span class="p">:</span> +</span><span id="qualify_tables-81"><a href="#qualify_tables-81"><span class="linenos">81</span></a> <span class="n">header</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> +</span><span id="qualify_tables-82"><a href="#qualify_tables-82"><span class="linenos">82</span></a> <span class="n">columns</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">reader</span><span class="p">)</span> +</span><span id="qualify_tables-83"><a href="#qualify_tables-83"><span class="linenos">83</span></a> <span class="n">schema</span><span class="o">.</span><span class="n">add_table</span><span class="p">(</span> +</span><span id="qualify_tables-84"><a href="#qualify_tables-84"><span class="linenos">84</span></a> <span class="n">source</span><span class="p">,</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="nb">type</span><span class="p">(</span><span class="n">v</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">header</span><span class="p">,</span> <span class="n">columns</span><span class="p">)}</span> +</span><span id="qualify_tables-85"><a href="#qualify_tables-85"><span class="linenos">85</span></a> <span class="p">)</span> +</span><span id="qualify_tables-86"><a href="#qualify_tables-86"><span class="linenos">86</span></a> <span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">Scope</span><span class="p">)</span> <span class="ow">and</span> <span class="n">source</span><span class="o">.</span><span class="n">is_udtf</span><span class="p">:</span> +</span><span id="qualify_tables-87"><a href="#qualify_tables-87"><span class="linenos">87</span></a> <span class="n">udtf</span> <span class="o">=</span> <span class="n">source</span><span class="o">.</span><span class="n">expression</span> +</span><span id="qualify_tables-88"><a href="#qualify_tables-88"><span class="linenos">88</span></a> <span class="n">table_alias</span> <span class="o">=</span> <span class="n">udtf</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 class="ow">or</span> <span class="n">exp</span><span class="o">.</span><span class="n">TableAlias</span><span class="p">(</span> +</span><span id="qualify_tables-89"><a href="#qualify_tables-89"><span class="linenos">89</span></a> <span class="n">this</span><span class="o">=</span><span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">())</span> +</span><span id="qualify_tables-90"><a href="#qualify_tables-90"><span class="linenos">90</span></a> <span class="p">)</span> +</span><span id="qualify_tables-91"><a href="#qualify_tables-91"><span class="linenos">91</span></a> <span class="n">udtf</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"alias"</span><span class="p">,</span> <span class="n">table_alias</span><span class="p">)</span> +</span><span id="qualify_tables-92"><a href="#qualify_tables-92"><span class="linenos">92</span></a> +</span><span id="qualify_tables-93"><a href="#qualify_tables-93"><span class="linenos">93</span></a> <span class="k">if</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">name</span><span class="p">:</span> +</span><span id="qualify_tables-94"><a href="#qualify_tables-94"><span class="linenos">94</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"this"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="n">next_alias_name</span><span class="p">()))</span> +</span><span id="qualify_tables-95"><a href="#qualify_tables-95"><span class="linenos">95</span></a> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">udtf</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">Values</span><span class="p">)</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">table_alias</span><span class="o">.</span><span class="n">columns</span><span class="p">:</span> +</span><span id="qualify_tables-96"><a href="#qualify_tables-96"><span class="linenos">96</span></a> <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">e</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">udtf</span><span class="o">.</span><span class="n">expressions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">expressions</span><span class="p">):</span> +</span><span id="qualify_tables-97"><a href="#qualify_tables-97"><span class="linenos">97</span></a> <span class="n">table_alias</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s2">"columns"</span><span class="p">,</span> <span class="n">exp</span><span class="o">.</span><span class="n">to_identifier</span><span class="p">(</span><span class="sa">f</span><span class="s2">"_col_</span><span class="si">{</span><span class="n">i</span><span class="si">}</span><span class="s2">"</span><span class="p">))</span> +</span><span id="qualify_tables-98"><a href="#qualify_tables-98"><span class="linenos">98</span></a> +</span><span id="qualify_tables-99"><a href="#qualify_tables-99"><span class="linenos">99</span></a> <span class="k">return</span> <span class="n">expression</span> </span></pre></div> - <div class="docstring"><p>Rewrite sqlglot AST to have fully qualified tables. Additionally, this -replaces "join constructs" (*) by equivalent SELECT * subqueries.</p> + <div class="docstring"><p>Rewrite sqlglot AST to have fully qualified tables. Join constructs such as +(t1 JOIN t2) AS t will be expanded into (SELECT * FROM t1 AS t1, t2 AS t2) AS t.</p> <h6 id="examples">Examples:</h6> @@ -286,9 +272,9 @@ replaces "join constructs" (*) by equivalent SELECT * subqueries.</p> <span class="gp">>>> </span><span class="n">qualify_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">,</span> <span class="n">db</span><span class="o">=</span><span class="s2">"db"</span><span class="p">)</span><span class="o">.</span><span class="n">sql</span><span class="p">()</span> <span class="go">'SELECT 1 FROM db.tbl AS tbl'</span> <span class="gp">>>></span> -<span class="gp">>>> </span><span class="n">expression</span> <span class="o">=</span> <span class="n"><a href="../../sqlglot.html#parse_one">sqlglot.parse_one</a></span><span class="p">(</span><span class="s2">"SELECT * FROM (tbl1 JOIN tbl2 ON id1 = id2)"</span><span class="p">)</span> +<span class="gp">>>> </span><span class="n">expression</span> <span class="o">=</span> <span class="n"><a href="../../sqlglot.html#parse_one">sqlglot.parse_one</a></span><span class="p">(</span><span class="s2">"SELECT 1 FROM (t1 JOIN t2) AS t"</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">qualify_tables</span><span class="p">(</span><span class="n">expression</span><span class="p">)</span><span class="o">.</span><span class="n">sql</span><span class="p">()</span> -<span class="go">'SELECT * FROM (SELECT * FROM tbl1 AS tbl1 JOIN tbl2 AS tbl2 ON id1 = id2) AS _q_0'</span> +<span class="go">'SELECT 1 FROM (SELECT * FROM t1 AS t1, t2 AS t2) AS t'</span> </code></pre> </div> </blockquote> @@ -307,8 +293,6 @@ replaces "join constructs" (*) by equivalent SELECT * subqueries.</p> <blockquote> <p>The qualified expression.</p> </blockquote> - -<p>(*) See section 7.2.1.2 in <a href="https://www.postgresql.org/docs/current/queries-table-expressions.html">https://www.postgresql.org/docs/current/queries-table-expressions.html</a></p> </div> |