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Commita192243

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Check syscache result in AlterStatistics
The syscache lookup may return NULL even for valid OID, for example dueto 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 ALTERSTATISTICS ... SET STATISTICS was introduced.Backpatch-through: 13Discussion:https://postgr.es/m/17372-bf3b6e947e35ae77%40postgresql.org
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‎src/backend/commands/statscmds.c‎

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@@ -677,6 +677,8 @@ AlterStatistics(AlterStatsStmt *stmt)
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rel=table_open(StatisticExtRelationId,RowExclusiveLock);
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oldtup=SearchSysCache1(STATEXTOID,ObjectIdGetDatum(stxoid));
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if (!HeapTupleIsValid(oldtup))
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elog(ERROR,"cache lookup failed for extended statistics object %u",stxoid);
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/* Must be owner of the existing statistics object */
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if (!pg_statistics_object_ownercheck(stxoid,GetUserId()))

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