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Put back example of using Result node to execute an INSERT.

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This commit is contained in:
Tom Lane
2005-04-24 15:32:07 +00:00
parent cdf39c7b61
commit 24475a7618
1 changed files with 7 additions and 2 deletions
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9
src/backend/executor/nodeResult.c
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@ -10,6 +10,11 @@
* *
* select 1 * 2 * select 1 * 2
* *
* insert into emp values ('mike', 15000)
*
* (Remember that in an INSERT or UPDATE, we need a plan tree that
* generates the new rows.)
*
* Result nodes are also used to optimise queries with constant * Result nodes are also used to optimise queries with constant
* qualifications (ie, quals that do not depend on the scanned data), * qualifications (ie, quals that do not depend on the scanned data),
* such as: * such as:
@ -20,7 +25,7 @@
* *
* Result (with 2 > 1 qual) * Result (with 2 > 1 qual)
* / * /
* SeqScan (emp.all) * SeqScan (emp.*)
* *
* At runtime, the Result node evaluates the constant qual once, * At runtime, the Result node evaluates the constant qual once,
* which is shown by EXPLAIN as a One-Time Filter. If it's * which is shown by EXPLAIN as a One-Time Filter. If it's
@ -33,7 +38,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeResult.c,v 1.30 2005/04/24 11:46:21 neilc Exp $ * $PostgreSQL: pgsql/src/backend/executor/nodeResult.c,v 1.31 2005/04/24 15:32:07 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */