Document meaning of lossy column.

diff --git a/src/include/catalog/pg_index.h b/src/include/catalog/pg_index.h
index c7af574..a490c8b 100644 (file)
--- a/src/include/catalog/pg_index.h
+++ b/src/include/catalog/pg_index.h
@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: pg_index.h,v 1.20 2001/05/17 00:29:52 momjian Exp $
+ * $Id: pg_index.h,v 1.21 2001/07/09 18:35:52 momjian Exp $
  *
  * NOTES
  *       the genbki.sh script reads this file and generates .bki
@@ -49,8 +49,10 @@ CATALOG(pg_index)
        int2vector      indkey;
        oidvector       indclass;
        bool            indisclustered; /* unused */
-       bool            indislossy;             /* do we fetch false tuples (lossy
-                                                                * compression)? */
+       bool            indislossy;             /* index hit must be reevaluated against heap
+                                                                * value to make sure it really is match;
+                                                                * typically used by hash.
+                                                                */
        bool            indhaskeytype;  /* not used, originally added by GIST */
        bool            indisunique;    /* is this a unique index? */
        bool            indisprimary;   /* is this index for primary key */