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Clarify documentation on the behavior of unnamed bind queries.

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This commit is contained in:
Bruce Momjian 2010-02-16 20:15:14 +00:00
parent 27cb626f7a
commit 93a57c3b57
2 changed files with 6 additions and 6 deletions
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8
doc/src/sgml/protocol.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/protocol.sgml,v 1.78 2010/02/03 09:47:19 heikki Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/protocol.sgml,v 1.79 2010/02/16 20:15:14 momjian Exp $ -->
<chapter id="protocol">
<title>Frontend/Backend Protocol</title>
@ -737,9 +737,9 @@
<para>
The unnamed prepared statement is likewise planned during Parse processing
if the Parse message defines no parameters. But if there are parameters,
query planning occurs during Bind processing instead. This allows the
planner to make use of the actual values of the parameters provided in
the Bind message when planning the query.
query planning occurs every time Bind parameters are supplied. This allows the
planner to make use of the actual values of the parameters provided by
each Bind message, rather than use generic estimates.
</para>
<note>

4
src/backend/tcop/postgres.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.588 2010/02/13 01:32:19 sriggs Exp $
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.589 2010/02/16 20:15:14 momjian Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -1469,7 +1469,7 @@ exec_bind_message(StringInfo input_message)
}
else
{
/* special-case the unnamed statement */
/* Unnamed statements are re-prepared for every bind */
psrc = unnamed_stmt_psrc;
if (!psrc)
ereport(ERROR,