PostgreSQL: Partition Split Validation Rollback
Alexander Korotkov reverted a partition splitting validation feature after buildfarm failures. The original commit attempted to prevent degenerate SPLIT PARTITION operations with DEFAULT partitions.
Duration: PT1M43S
Transcript
Good morning. This is your PostgreSQL development briefing for May 21st, 2026.
Yesterday saw two related commits from Alexander Korotkov addressing partition splitting functionality. Initially, Korotkov committed a patch authored by Chao Li that added validation to the SPLIT PARTITION command. The change was designed to prevent a specific degenerate case where users could incorrectly use SPLIT PARTITION to add a DEFAULT partition when the split would leave one replacement partition with identical bounds to the original.
The validation logic detected when a non-DEFAULT replacement partition maintained the same boundaries as the split partition, raising an error to guide users toward the proper CREATE TABLE or ALTER TABLE ATTACH PARTITION commands for adding DEFAULT partitions.
However, this enhancement was short-lived. Korotkov reverted the entire change after buildfarm failures emerged, removing the 150 lines of validation code from the partitioning bounds module along with associated regression tests.
The revert affects the partition_split test suite, removing 52 lines of SQL tests and 59 lines of expected output that demonstrated the new validation behavior. The buildfarm failures suggest the validation logic may have had unintended consequences or edge cases that weren't caught during initial review.
What's next: The development team will need to investigate the buildfarm failures before reconsidering this validation feature. A revised approach to preventing degenerate SPLIT PARTITION operations may emerge in future commits.
That's your PostgreSQL update for today.