branch-4.1:[fix](partition_prune) Avoid incorrect convert_tz partition pruning across DST transitions #63853#64812
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…cross DST transitions (apache#63853) ### What problem does this PR solve? Related PR: apache#40047 apache#64029 Problem Summary: Nereids currently treats `convert_tz()` as monotonic whenever both timezone arguments are constant. That assumption is not always correct. When a partition predicate contains `convert_tz(partition_col, from_tz, to_tz)`, partition pruning folds the partition range endpoints and infers a value range for the function. This is only valid if `convert_tz()` is monotonic on the current partition range. Across DST transitions, `convert_tz()` is not monotonic: - during fall-back, different input timestamps can map to the same local time - during spring-forward, a local-time gap can break the endpoint-based range inference As a result, FE may prune partitions that still contain matching rows. The reported case is `convert_tz(ts, 'UTC', 'Europe/Paris')` around the Europe/Paris DST fall-back boundary, where a valid partition is incorrectly removed. This PR fixes the issue by tightening the monotonicity check for `convert_tz()`: - keep the optimization for fixed-offset timezones - disable the monotonic shortcut when the source local-time range touches a DST transition window - disable the monotonic shortcut when the corresponding target instant range touches a DST transition This keeps normal partition pruning behavior for safe cases while avoiding wrong pruning around DST boundaries.
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Jun 25, 2026
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PR approved by at least one committer and no changes requested. |
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cherry-picked from #63853