a88c71b294
The task "MDEV-25829 Change default Unicode collation to uca1400_ai_ci" previously changed collation derivation for string user variables from DERIVATION_EXPLICIT to DERIVATION_COERCIBLE, to resolve illegal collation mix conflicts between table columns and user variables when they have different collations. However, DERIVATION_COERCIBLE was a wrong choice because it caused conflicts between string literals and user variables when they have different collations. Adding a new collation derivation level DERIVATION_USERVAR. This makes the collation of a user variable: - weaker than a table column (like it was intended by MDEV-25829) - but stronger than a literal (like it was in pre-MDEV-25829) Cleanup in sql_type.h: Removing the line "- BINARY(expr)" from the before-DERIVATION_CAST comment, as it was on a wrong place. It's also listed on the correct place before DERIVATION_IMPLICIT. |
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| libmariadb@de6305915f | ||
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| CONTRIBUTING.md | ||
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Code status:
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MariaDB: The innovative open source database
MariaDB was designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
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