From d4ce5a4f4c3516e88fa34c53bcc7313db90a3c08 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 12 Jan 2003 22:35:29 +0000
Subject: Revise cost_qual_eval() to compute both startup (one-time) and
 per-tuple costs for expression evaluation, not only per-tuple cost as before.
 This extension is needed in order to deal realistically with hashed or
 materialized sub-selects.

---
 doc/src/sgml/indexcost.sgml | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/indexcost.sgml b/doc/src/sgml/indexcost.sgml
index 63cf8daf22d..2e62280a8be 100644
--- a/doc/src/sgml/indexcost.sgml
+++ b/doc/src/sgml/indexcost.sgml
@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/Attic/indexcost.sgml,v 2.12 2002/08/22 00:01:40 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/Attic/indexcost.sgml,v 2.13 2003/01/12 22:35:29 tgl Exp $
 -->
 
  <chapter id="indexcost">
@@ -237,9 +237,10 @@ amcostestimate (Query *root,
      * Also, we charge for evaluation of the indexquals at each index tuple.
      * All the costs are assumed to be paid incrementally during the scan.
      */
-    *indexStartupCost = 0;
+    cost_qual_eval(&index_qual_cost, indexQuals);
+    *indexStartupCost = index_qual_cost.startup;
     *indexTotalCost = numIndexPages +
-        (cpu_index_tuple_cost + cost_qual_eval(indexQuals)) * numIndexTuples;
+        (cpu_index_tuple_cost + index_qual_cost.per_tuple) * numIndexTuples;
      </programlisting>
     </para>
    </step>
-- 
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