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from sqlglot._typing import E
from sqlglot.dialects.dialect import Dialect, DialectType
def normalize_identifiers(expression: E, dialect: DialectType = None) -> E:
"""
Normalize all unquoted identifiers to either lower or upper case, depending
on the dialect. This essentially makes those identifiers case-insensitive.
Note:
Some dialects (e.g. BigQuery) treat identifiers as case-insensitive even
when they're quoted, so in these cases all identifiers are normalized.
Example:
>>> import sqlglot
>>> expression = sqlglot.parse_one('SELECT Bar.A AS A FROM "Foo".Bar')
>>> normalize_identifiers(expression).sql()
'SELECT bar.a AS a FROM "Foo".bar'
Args:
expression: The expression to transform.
dialect: The dialect to use in order to decide how to normalize identifiers.
Returns:
The transformed expression.
"""
return expression.transform(Dialect.get_or_raise(dialect).normalize_identifier, copy=False)
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