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-rw-r--r--src/backend/access/hash/hashfunc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/backend/access/hash/hashfunc.c b/src/backend/access/hash/hashfunc.c
index dabaf5a7dc2..614f4ff2f5b 100644
--- a/src/backend/access/hash/hashfunc.c
+++ b/src/backend/access/hash/hashfunc.c
@@ -297,6 +297,9 @@ hashvarlena(PG_FUNCTION_ARGS)
* of 2. There is no need to do mod a prime (mod is sooo slow!).
* If you need less than 32 bits, use a bitmask.
*
+ * This procedure must never throw elog(ERROR); the ResourceOwner code
+ * relies on this not to fail.
+ *
* Note: we could easily change this function to return a 64-bit hash value
* by using the final values of both b and c. b is perhaps a little less
* well mixed than c, however.