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from sqlglot import exp
from sqlglot._typing import E
from sqlglot.dialects.dialect import RESOLVES_IDENTIFIERS_AS_UPPERCASE, 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.
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(_normalize, dialect, copy=False)
def _normalize(node: exp.Expression, dialect: DialectType = None) -> exp.Expression:
if isinstance(node, exp.Identifier) and not node.quoted:
node.set(
"this",
node.this.upper()
if dialect in RESOLVES_IDENTIFIERS_AS_UPPERCASE
else node.this.lower(),
)
return node
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