Update comment in relcache.c.

Commit 665d1fad9 introduced rd_pkindex, and made RelationGetIndexList
responsible for updating it, but didn't bother to fix
RelationGetIndexList's header comment to say so.

diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 4dd2e2b2c64b378a21a1ce9fcb45bdc2cd0d0014..e9295a99f8138125cacf0e473cfc9d730f159c24 100644 (file)
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -4327,9 +4327,10 @@ RelationGetFKeyList(Relation relation)
  * it is the pg_class OID of a unique index on OID when the relation has one,
  * and InvalidOid if there is no such index.
  *
- * In exactly the same way, we update rd_replidindex, which is the pg_class
- * OID of an index to be used as the relation's replication identity index,
- * or InvalidOid if there is no such index.
+ * In exactly the same way, we update rd_pkindex, which is the OID of the
+ * relation's primary key index if any, else InvalidOid; and rd_replidindex,
+ * which is the pg_class OID of an index to be used as the relation's
+ * replication identity index, or InvalidOid if there is no such index.
  */
 List *
 RelationGetIndexList(Relation relation)
@@ -4797,7 +4798,7 @@ RelationGetIndexAttrBitmap(Relation relation, IndexAttrBitmapKind attrKind)
                return NULL;
 
        /*
-        * Copy the rd_pkindex and rd_replidindex value computed by
+        * Copy the rd_pkindex and rd_replidindex values computed by
         * RelationGetIndexList before proceeding.  This is needed because a
         * relcache flush could occur inside index_open below, resetting the
         * fields managed by RelationGetIndexList. (The values we're computing