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Merging upstream version 25.16.1.

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Signed-off-by: Daniel Baumann <daniel@debian.org>
This commit is contained in:
Daniel Baumann 2025-02-13 21:52:32 +01:00
parent 7688e2bdf8
commit bad79d1f7c
Signed by: daniel
GPG key ID: FBB4F0E80A80222F
110 changed files with 75353 additions and 68092 deletions
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10
sqlglot/optimizer/normalize_identifiers.py
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@ -19,8 +19,12 @@ def normalize_identifiers(expression: str, dialect: DialectType = None) -> exp.I
def normalize_identifiers(expression, dialect=None):
"""
Normalize all unquoted identifiers to either lower or upper case, depending
on the dialect. This essentially makes those identifiers case-insensitive.
Normalize identifiers by converting them to either lower or upper case,
ensuring the semantics are preserved in each case (e.g. by respecting
case-sensitivity).
This transformation reflects how identifiers would be resolved by the engine corresponding
to each SQL dialect, and plays a very important role in the standardization of the AST.
It's possible to make this a no-op by adding a special comment next to the
identifier of interest:
@ -30,7 +34,7 @@ def normalize_identifiers(expression, dialect=None):
In this example, the identifier `a` will not be normalized.
Note:
Some dialects (e.g. BigQuery) treat identifiers as case-insensitive even
Some dialects (e.g. DuckDB) treat all identifiers as case-insensitive even
when they're quoted, so in these cases all identifiers are normalized.
Example: