Check syscache result in AlterStatistics
The syscache lookup may return NULL even for valid OID, for example due
to a concurrent DROP STATISTICS, so a HeapTupleIsValid is necessary.
Without it, it may fail with a segfault.
Reported by Alexander Lakhin, patch by me. Backpatch to 13, where ALTER
STATISTICS ... SET STATISTICS was introduced.
Backpatch-through: 13
Discussion: https://postgr.es/m/17372-bf3b6e947e35ae77%40postgresql.org
Branch
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REL_13_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/267ccc38ba6a95889d98959f183de64ceff23087
Modified Files
--------------
src/backend/commands/statscmds.c | 2 ++
1 file changed, 2 insertions(+)
