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风月
7054eea8d2
A partition bound is persisted with the type of the column at the time it was written. When an ALTER TABLE changes the type of a column referenced by a partition expression (widening the time index unit is the common case), each region rewrites the bound literal to the new type while building its scan predicate. A millisecond bound like year 3000 fits milliseconds but overflows nanoseconds, so every scan of the region fails once the table schema is updated -- and some regions may already be altered when the failure surfaces. Validate every region's persisted expression on prepare, before any region is modified: parse the persisted JSON (mirrored types, since common-meta cannot depend on the partition crate which depends on it), replay the same value -> ScalarValue conversion and checked cast the region performs, and reject the ALTER naming the offending region when a bound cannot be represented with the new column type. Incompatible changes are rejected atomically; compatible widening proceeds unchanged. Adds meta-level tests (multi-region rejection naming the second region, compatible widening completing) and an end-to-end sqlness case. Fixes #9454 Signed-off-by: fengyue-xve <1759519137@qq.com>