Add case-insensitive unique constraints#1738
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Add IndexColumns(case_insensitive=True) to build a case-insensitive unique index by wrapping each named column in LOWER(). IndexColumns now also accepts SQLAlchemy expressions for arbitrary functional indexes, and index auto-naming derives names from the index expressions so functional indexes get valid names. Closes #615
Merging this PR will improve performance by 21.35%
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Add a runtime test that a raw SQLAlchemy expression functional unique index (UPPER(name)) enforces case-insensitive uniqueness, and switch the standalone-expression example from LOWER to UPPER in docs and test so it is distinct from the built-in case_insensitive=True path.
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Adds
IndexColumns(..., case_insensitive=True)to build a case-insensitive unique index by wrapping each named column inLOWER(), so values differing only in case cannot both be stored.IndexColumnsnow also accepts SQLAlchemy expressions for arbitrary functional indexes, and index auto-naming derives names from the index expressions so functional indexes get valid names. On MySQL this needs 8.0.13+.Closes #615