def test_aliases() -> None:
# No context
col1 = Column("al1", "column1", "table1")
col2 = Column("al1", "column1", "table1")
assert col1.accept(
ClickhouseExpressionFormatter()) == "(table1.column1 AS al1)"
assert col2.accept(
ClickhouseExpressionFormatter()) == "(table1.column1 AS al1)"
# With Context
pc = ParsingContext()
assert col1.accept(
ClickhouseExpressionFormatter(pc)) == "(table1.column1 AS al1)"
assert col2.accept(ClickhouseExpressionFormatter(pc)) == "al1"
# Hierarchical expression inherits parsing context and applies alaises
f = FunctionCall(
None,
"f1",
(
FunctionCall("tag[something]", "tag",
(Column(None, "column1", "table1"))),
FunctionCall("tag[something]", "tag",
(Column(None, "column1", "table1"))),
FunctionCall("tag[something]", "tag",
(Column(None, "column1", "table1"))),
),
)
expected = "f1((tag(table1.column1) AS `tag[something]`), `tag[something]`, `tag[something]`)"
assert f.accept(ClickhouseExpressionFormatter()) == expected
def translate_function_strict(self, exp: FunctionCall) -> FunctionCall:
"""
Unfortunately it is not possible to avoid this assertion.
Though the structure of TranslationMappers guarantees that this
assertion can never fail since it defines the valid translations
and it statically requires a FunctionCallMapper to translate a
FunctionCall.
FunctionCallMapper returns FunctionCall as return type, thus
always satisfying the assertion.
"""
f = exp.accept(self)
assert isinstance(f, FunctionCall)
return f