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explain change

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This commit is contained in:
Bruce Momjian 1996-12-29 19:31:16 +00:00
parent bf6fdeebb5
commit 765dd2a4c0
3 changed files with 23 additions and 13 deletions
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21
src/backend/commands/explain.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.6 1996/12/29 00:53:20 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.7 1996/12/29 19:30:55 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -27,8 +27,8 @@
typedef struct ExplainState {
/* options */
int printCost; /* print cost */
int printNodes; /* do nodeToString() instead */
bool printCost; /* print cost */
bool printNodes; /* do nodeToString() instead */
/* other states */
List *rtable; /* range table */
} ExplainState;
@ -69,18 +69,25 @@ ExplainQuery(Query *query, List *options, CommandDest dest)
memset(es, 0, sizeof(ExplainState));
/* parse options */
es->printCost = 1; /* default */
while (options) {
char *ostr = strVal(lfirst(options));
if (!strcasecmp(ostr, "cost"))
es->printCost = 1;
else if (!strcasecmp(ostr, "full"))
es->printNodes = 1;
es->printCost = true;
else if (!strcasecmp(ostr, "plan"))
es->printNodes = true;
else if (!strcasecmp(ostr, "full")) {
es->printCost = true;
es->printNodes = true;
}
else
elog(WARN, "Unknown EXPLAIN option: %s", ostr);
options = lnext(options);
}
if (!es->printCost && !es->printNodes)
es->printCost = true; /* default */
es->rtable = query->rtable;
if (es->printNodes)

4
src/bin/psql/psqlHelp.h
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@ -5,7 +5,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: psqlHelp.h,v 1.8 1996/12/29 00:53:59 momjian Exp $
* $Id: psqlHelp.h,v 1.9 1996/12/29 19:31:06 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -124,7 +124,7 @@ static struct _helpStruct QL_HELP[] = {
"end [transaction];"},
{ "explain",
"explain the query execution plan",
"explain [with {cost|full}] <query>"},
"explain [with {cost|plan|full}] <query>"},
{ "fetch",
"retrieve tuples from a cursor",
"fetch [forward|backward] [<number>|all] [in <cursorname>];"},

11
src/man/explain.l
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@ -1,14 +1,17 @@
.\" This is -*-nroff-*-
.\" XXX standard disclaimer belongs here....
.\" $Header: /cvsroot/pgsql/src/man/Attic/explain.l,v 1.2 1996/12/29 03:55:36 momjian Exp $
.\" $Header: /cvsroot/pgsql/src/man/Attic/explain.l,v 1.3 1996/12/29 19:31:16 momjian Exp $
.TH EXPLAIN SQL 11/05/95 PostgreSQL PostgreSQL
.SH NAME
explain \(em explains statement execution details
.SH SYNOPSIS
.nf
\fBexplain [with\fP \fB{cost|full}]\fR query
\fBexplain [with\fP \fB{cost|plan|full}]\fR query
.fi
.SH DESCRIPTION
This command outputs details about the supplied query. The default
output is the computed query cost. \f2full\f1 displays a full query plan
and cost.
output is the computed query cost. \f2plan\f1 displays the full query
plan. \f2full\f1 display both query plan and query cost.
.PP
The query cost and plan can be affected by running vacuum.