41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
from __future__ import annotations
|
|
|
|
from sqlglot import exp, generator, parser, transforms
|
|
from sqlglot.dialects.dialect import Dialect
|
|
|
|
|
|
class Tableau(Dialect):
|
|
class Generator(generator.Generator):
|
|
JOIN_HINTS = False
|
|
TABLE_HINTS = False
|
|
|
|
TRANSFORMS = {
|
|
**generator.Generator.TRANSFORMS,
|
|
exp.Select: transforms.preprocess([transforms.eliminate_distinct_on]),
|
|
}
|
|
|
|
PROPERTIES_LOCATION = {
|
|
**generator.Generator.PROPERTIES_LOCATION,
|
|
exp.VolatileProperty: exp.Properties.Location.UNSUPPORTED,
|
|
}
|
|
|
|
def if_sql(self, expression: exp.If) -> str:
|
|
this = self.sql(expression, "this")
|
|
true = self.sql(expression, "true")
|
|
false = self.sql(expression, "false")
|
|
return f"IF {this} THEN {true} ELSE {false} END"
|
|
|
|
def coalesce_sql(self, expression: exp.Coalesce) -> str:
|
|
return f"IFNULL({self.sql(expression, 'this')}, {self.expressions(expression)})"
|
|
|
|
def count_sql(self, expression: exp.Count) -> str:
|
|
this = expression.this
|
|
if isinstance(this, exp.Distinct):
|
|
return f"COUNTD({self.expressions(this, flat=True)})"
|
|
return f"COUNT({self.sql(expression, 'this')})"
|
|
|
|
class Parser(parser.Parser):
|
|
FUNCTIONS = {
|
|
**parser.Parser.FUNCTIONS,
|
|
"COUNTD": lambda args: exp.Count(this=exp.Distinct(expressions=args)),
|
|
}
|