fix(plan): fallback UPDATE generated-column correctness (follow-up #24536)#24600
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ck89119 wants to merge 2 commits into
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fix(plan): fallback UPDATE generated-column correctness (follow-up #24536)#24600ck89119 wants to merge 2 commits into
ck89119 wants to merge 2 commits into
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aunjgr
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May 26, 2026
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The fallback UPDATE planner change keeps generated-column projections contiguous after rewrite and now recomputes them from the rewritten source expressions, so DEFAULT / ON UPDATE / chained generated-column cases stay correct. The new planner tests cover the risky cases.
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What type of PR is this?
Which issue(s) this PR fixes:
issue #23137
What this PR does / why we need it:
Follow-up correctness fixes for PostgreSQL-style
UPDATE ... SET ... FROM ... WHEREfallback planning, completing #24536 (already merged tomain).These two fixes were added during review of the 4.0-dev backport (#24562) but were missing on
main:892d892b3): generated-column recompute expressions are inserted into the current target table's contiguous update segment instead of being appended after all targets, so later targets in a multi-target fallbackUPDATEno longer read/write wrong projection positions.988c01bbb): the fallback generated-column recompute now runs afterrewriteUpdateQueryLastNode(), soDEFAULT/ON UPDATErewrites are visible before generated expressions are derived; the generated-column lookup is mutable so generated-on-generated chains use freshly recomputed earlier expressions.Added planner coverage for the multi-target fallback + generated-column case, and for fallback generated columns over
DEFAULT,ON UPDATE, and generated-on-generated chains.