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-rw-r--r--src/backend/executor/execGrouping.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/executor/execGrouping.c b/src/backend/executor/execGrouping.c
index 1f02428a5b3..bfb8cbb303c 100644
--- a/src/backend/executor/execGrouping.c
+++ b/src/backend/executor/execGrouping.c
@@ -3,6 +3,10 @@
* execGrouping.c
* executor utility routines for grouping, hashing, and aggregation
*
+ * Note: we currently assume that equality and hashing functions are not
+ * collation-sensitive, so the code in this file has no support for passing
+ * collation settings through from callers. That may have to change someday.
+ *
* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*