Clarify nbtree array preprocessing comment.

Oversight in commit 5bf748b8.

diff --git a/src/backend/access/nbtree/nbtutils.c b/src/backend/access/nbtree/nbtutils.c
index 14253ead8bd54a6201ced2dbd5c7b75aedc2db79..1b75066fb510b147f1267c5fe590f4798043a61f 100644 (file)
--- a/src/backend/access/nbtree/nbtutils.c
+++ b/src/backend/access/nbtree/nbtutils.c
@@ -2901,8 +2901,9 @@ _bt_preprocess_keys(IndexScanDesc scan)
                         * ...unless we have to keep the old key because it's
                         * an array that rendered the new key redundant.  We
                         * need to make sure that we don't throw away an array
-                        * scan key.  _bt_compare_scankey_args expects us to
-                        * always keep arrays (and discard non-arrays).
+                        * scan key.  _bt_preprocess_array_keys_final expects
+                        * us to keep all of the arrays that weren't already
+                        * eliminated by _bt_preprocess_array_keys earlier on.
                         */
                        Assert(!(inkey->sk_flags & SK_SEARCHARRAY));
                    }