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Diffstat (limited to 'src/backend/executor/nodeHash.c')
| -rw-r--r-- | src/backend/executor/nodeHash.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/backend/executor/nodeHash.c b/src/backend/executor/nodeHash.c index 123079c16cc..c48d92259f9 100644 --- a/src/backend/executor/nodeHash.c +++ b/src/backend/executor/nodeHash.c @@ -832,7 +832,10 @@ ExecChooseHashTableSize(double ntuples, int tupwidth, bool useskew, * overhead for the hash code, pointer to the next tuple, etc. */ bucket_size = (tupsize * NTUP_PER_BUCKET + sizeof(HashJoinTuple)); - sbuckets = pg_nextpower2_size_t(hash_table_bytes / bucket_size); + if (hash_table_bytes <= bucket_size) + sbuckets = 1; /* avoid pg_nextpower2_size_t(0) */ + else + sbuckets = pg_nextpower2_size_t(hash_table_bytes / bucket_size); sbuckets = Min(sbuckets, max_pointers); nbuckets = (int) sbuckets; nbuckets = pg_nextpower2_32(nbuckets); |