Fix ALTER TABLE .. ADD COLUMN with complex inheritance trees
This command, when used to add a column on a parent table with a complex
inheritance tree, tried to update multiple times the same tuple in
pg_attribute for a child table when incrementing attinhcount, causing
failures with "tuple already updated by self" because of a missing
CommandCounterIncrement() between two updates.
This exists for a rather long time, so backpatch all the way down.
Reported-by: Alexander Lakhin
Author: Tender Wang
Reviewed-by: Richard Guo
Discussion: https://postgr.es/m/18297-b04cd83a55b51e35@postgresql.org
Backpatch-through: 12
Branch
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REL_16_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/51193e7a7d333e2f19048c97a336da436b7d97e9
Modified Files
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src/backend/commands/tablecmds.c | 4 ++++
src/test/regress/expected/inherit.out | 17 +++++++++++++++++
src/test/regress/sql/inherit.sql | 9 +++++++++
3 files changed, 30 insertions(+)