fix(mysql, sqlite): convert boolean literal to bool type #4282
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Previously, MySQL boolean literals like `SELECT true` were incorrectly converted to int32 type, while table columns with BOOL/BOOLEAN/TINYINT(1) types were correctly converted to bool. The TiDB parser represents boolean literals as mysql.TypeLonglong with value 1 (true) or 0 (false), which was indistinguishable from integer literals like `SELECT 1`. This fix: - Detects boolean literals by examining the original SQL text - Converts `true`/`false` (case-insensitive) to bool type - Preserves integer literals like `SELECT 1` as int32 - Supports all case variations: TRUE, True, FALSE, False, etc. Test cases: - SELECT true/false → bool - SELECT TRUE/FALSE → bool - SELECT true AS col → bool - SELECT 1/0 → int32 (unchanged)
Previously, SQLite boolean literals like `SELECT true` were incorrectly converted to int64 type, while PostgreSQL correctly returned bool. The ANTLR parser provides TRUE_() and FALSE_() tokens, but these were originally implemented to return Integer in PR sqlc-dev#1447 (2022-02-19) without specific reasoning, likely because SQLite internally uses integers (1/0) for boolean values. This fix changes the TRUE_()/FALSE_() handling to return ast.Boolean instead of ast.Integer, aligning SQLite's behavior with PostgreSQL and providing a more type-safe interface. Test results: - SELECT true/false → bool (was int64) - SELECT TRUE/FALSE → bool (was int64) - SELECT 1 → int64 (unchanged) Added test: internal/endtoend/testdata/select_true_literal/sqlite/
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Previously, MySQL boolean literals like
SELECT truewere incorrectly converted to int32 type, while table columns with BOOL/BOOLEAN/TINYINT(1) types were correctly converted to bool.