sqlglot.executor.env
1import datetime 2import inspect 3import re 4import statistics 5from functools import wraps 6 7from sqlglot import exp 8from sqlglot.generator import Generator 9from sqlglot.helper import PYTHON_VERSION 10 11 12class reverse_key: 13 def __init__(self, obj): 14 self.obj = obj 15 16 def __eq__(self, other): 17 return other.obj == self.obj 18 19 def __lt__(self, other): 20 return other.obj < self.obj 21 22 23def filter_nulls(func, empty_null=True): 24 @wraps(func) 25 def _func(values): 26 filtered = tuple(v for v in values if v is not None) 27 if not filtered and empty_null: 28 return None 29 return func(filtered) 30 31 return _func 32 33 34def null_if_any(*required): 35 """ 36 Decorator that makes a function return `None` if any of the `required` arguments are `None`. 37 38 This also supports decoration with no arguments, e.g.: 39 40 @null_if_any 41 def foo(a, b): ... 42 43 In which case all arguments are required. 44 """ 45 f = None 46 if len(required) == 1 and callable(required[0]): 47 f = required[0] 48 required = () 49 50 def decorator(func): 51 if required: 52 required_indices = [ 53 i for i, param in enumerate(inspect.signature(func).parameters) if param in required 54 ] 55 56 def predicate(*args): 57 return any(args[i] is None for i in required_indices) 58 59 else: 60 61 def predicate(*args): 62 return any(a is None for a in args) 63 64 @wraps(func) 65 def _func(*args): 66 if predicate(*args): 67 return None 68 return func(*args) 69 70 return _func 71 72 if f: 73 return decorator(f) 74 75 return decorator 76 77 78@null_if_any("substr", "this") 79def str_position(substr, this, position=None): 80 position = position - 1 if position is not None else position 81 return this.find(substr, position) + 1 82 83 84@null_if_any("this") 85def substring(this, start=None, length=None): 86 if start is None: 87 return this 88 elif start == 0: 89 return "" 90 elif start < 0: 91 start = len(this) + start 92 else: 93 start -= 1 94 95 end = None if length is None else start + length 96 97 return this[start:end] 98 99 100@null_if_any 101def cast(this, to): 102 if to == exp.DataType.Type.DATE: 103 return datetime.date.fromisoformat(this) 104 if to == exp.DataType.Type.DATETIME: 105 return datetime.datetime.fromisoformat(this) 106 if to == exp.DataType.Type.BOOLEAN: 107 return bool(this) 108 if to in exp.DataType.TEXT_TYPES: 109 return str(this) 110 if to in {exp.DataType.Type.FLOAT, exp.DataType.Type.DOUBLE}: 111 return float(this) 112 if to in exp.DataType.NUMERIC_TYPES: 113 return int(this) 114 raise NotImplementedError(f"Casting to '{to}' not implemented.") 115 116 117def ordered(this, desc, nulls_first): 118 if desc: 119 return reverse_key(this) 120 return this 121 122 123@null_if_any 124def interval(this, unit): 125 unit = unit.lower() 126 plural = unit + "s" 127 if plural in Generator.TIME_PART_SINGULARS: 128 unit = plural 129 return datetime.timedelta(**{unit: float(this)}) 130 131 132ENV = { 133 "exp": exp, 134 # aggs 135 "ARRAYAGG": list, 136 "AVG": filter_nulls(statistics.fmean if PYTHON_VERSION >= (3, 8) else statistics.mean), # type: ignore 137 "COUNT": filter_nulls(lambda acc: sum(1 for _ in acc), False), 138 "MAX": filter_nulls(max), 139 "MIN": filter_nulls(min), 140 "SUM": filter_nulls(sum), 141 # scalar functions 142 "ABS": null_if_any(lambda this: abs(this)), 143 "ADD": null_if_any(lambda e, this: e + this), 144 "ARRAYANY": null_if_any(lambda arr, func: any(func(e) for e in arr)), 145 "BETWEEN": null_if_any(lambda this, low, high: low <= this and this <= high), 146 "BITWISEAND": null_if_any(lambda this, e: this & e), 147 "BITWISELEFTSHIFT": null_if_any(lambda this, e: this << e), 148 "BITWISEOR": null_if_any(lambda this, e: this | e), 149 "BITWISERIGHTSHIFT": null_if_any(lambda this, e: this >> e), 150 "BITWISEXOR": null_if_any(lambda this, e: this ^ e), 151 "CAST": cast, 152 "COALESCE": lambda *args: next((a for a in args if a is not None), None), 153 "CONCAT": null_if_any(lambda *args: "".join(args)), 154 "CONCATWS": null_if_any(lambda this, *args: this.join(args)), 155 "DATESTRTODATE": null_if_any(lambda arg: datetime.date.fromisoformat(arg)), 156 "DIV": null_if_any(lambda e, this: e / this), 157 "DOT": null_if_any(lambda e, this: e[this]), 158 "EQ": null_if_any(lambda this, e: this == e), 159 "EXTRACT": null_if_any(lambda this, e: getattr(e, this)), 160 "GT": null_if_any(lambda this, e: this > e), 161 "GTE": null_if_any(lambda this, e: this >= e), 162 "IFNULL": lambda e, alt: alt if e is None else e, 163 "IF": lambda predicate, true, false: true if predicate else false, 164 "INTDIV": null_if_any(lambda e, this: e // this), 165 "INTERVAL": interval, 166 "LIKE": null_if_any( 167 lambda this, e: bool(re.match(e.replace("_", ".").replace("%", ".*"), this)) 168 ), 169 "LOWER": null_if_any(lambda arg: arg.lower()), 170 "LT": null_if_any(lambda this, e: this < e), 171 "LTE": null_if_any(lambda this, e: this <= e), 172 "MAP": null_if_any(lambda *args: dict(zip(*args))), # type: ignore 173 "MOD": null_if_any(lambda e, this: e % this), 174 "MUL": null_if_any(lambda e, this: e * this), 175 "NEQ": null_if_any(lambda this, e: this != e), 176 "ORD": null_if_any(ord), 177 "ORDERED": ordered, 178 "POW": pow, 179 "STRPOSITION": str_position, 180 "SUB": null_if_any(lambda e, this: e - this), 181 "SUBSTRING": substring, 182 "TIMESTRTOTIME": null_if_any(lambda arg: datetime.datetime.fromisoformat(arg)), 183 "UPPER": null_if_any(lambda arg: arg.upper()), 184 "YEAR": null_if_any(lambda arg: arg.year), 185 "MONTH": null_if_any(lambda arg: arg.month), 186 "DAY": null_if_any(lambda arg: arg.day), 187 "CURRENTDATETIME": datetime.datetime.now, 188 "CURRENTTIMESTAMP": datetime.datetime.now, 189 "CURRENTTIME": datetime.datetime.now, 190 "CURRENTDATE": datetime.date.today, 191 "STRFTIME": null_if_any(lambda fmt, arg: datetime.datetime.fromisoformat(arg).strftime(fmt)), 192}
class
reverse_key:
def
filter_nulls(func, empty_null=True):
def
null_if_any(*required):
35def null_if_any(*required): 36 """ 37 Decorator that makes a function return `None` if any of the `required` arguments are `None`. 38 39 This also supports decoration with no arguments, e.g.: 40 41 @null_if_any 42 def foo(a, b): ... 43 44 In which case all arguments are required. 45 """ 46 f = None 47 if len(required) == 1 and callable(required[0]): 48 f = required[0] 49 required = () 50 51 def decorator(func): 52 if required: 53 required_indices = [ 54 i for i, param in enumerate(inspect.signature(func).parameters) if param in required 55 ] 56 57 def predicate(*args): 58 return any(args[i] is None for i in required_indices) 59 60 else: 61 62 def predicate(*args): 63 return any(a is None for a in args) 64 65 @wraps(func) 66 def _func(*args): 67 if predicate(*args): 68 return None 69 return func(*args) 70 71 return _func 72 73 if f: 74 return decorator(f) 75 76 return decorator
Decorator that makes a function return None
if any of the required
arguments are None
.
This also supports decoration with no arguments, e.g.:
@null_if_any
def foo(a, b): ...
In which case all arguments are required.
@null_if_any('substr', 'this')
def
str_position(substr, this, position=None):
@null_if_any('this')
def
substring(this, start=None, length=None):
@null_if_any
def
cast(this, to):
101@null_if_any 102def cast(this, to): 103 if to == exp.DataType.Type.DATE: 104 return datetime.date.fromisoformat(this) 105 if to == exp.DataType.Type.DATETIME: 106 return datetime.datetime.fromisoformat(this) 107 if to == exp.DataType.Type.BOOLEAN: 108 return bool(this) 109 if to in exp.DataType.TEXT_TYPES: 110 return str(this) 111 if to in {exp.DataType.Type.FLOAT, exp.DataType.Type.DOUBLE}: 112 return float(this) 113 if to in exp.DataType.NUMERIC_TYPES: 114 return int(this) 115 raise NotImplementedError(f"Casting to '{to}' not implemented.")
def
ordered(this, desc, nulls_first):
@null_if_any
def
interval(this, unit):