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Clean up code associated with updating pg_class statistics columns

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(relpages/reltuples).  To do this, create formal support in heapam.c for
"overwrite" tuple updates (including xlog replay capability) and use that
instead of the ad-hoc overwrites we'd been using in VACUUM and CREATE INDEX.
Take the responsibility for updating stats during CREATE INDEX out of the
individual index AMs, and do it where it belongs, in catalog/index.c.  Aside
from being more modular, this avoids having to update the same tuple twice in
some paths through CREATE INDEX.  It's probably not measurably faster, but
for sure it's a lot cleaner than before.
This commit is contained in:
Tom Lane
2006-05-10 23:18:39 +00:00
parent c1f39437d0
commit 3fdeb189e9
17 changed files with 519 additions and 404 deletions
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6
doc/src/sgml/indexam.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/indexam.sgml,v 2.10 2006/05/02 22:25:09 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/indexam.sgml,v 2.11 2006/05/10 23:18:38 tgl Exp $ -->
<chapter id="indexam">
<title>Index Access Method Interface Definition</title>
@ -144,7 +144,7 @@
<para>
<programlisting>
void
IndexBuildResult *
ambuild (Relation heapRelation,
Relation indexRelation,
IndexInfo *indexInfo);
@ -155,6 +155,8 @@ ambuild (Relation heapRelation,
in the table. Ordinarily the <function>ambuild</> function will call
<function>IndexBuildHeapScan()</> to scan the table for existing tuples
and compute the keys that need to be inserted into the index.
The function must return a palloc'd struct containing statistics about
the new index.
</para>
<para>