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explain change

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 * 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 { typedef struct ExplainState {
/* options */ /* options */
int printCost; /* print cost */ bool printCost; /* print cost */
int printNodes; /* do nodeToString() instead */ bool printNodes; /* do nodeToString() instead */
/* other states */ /* other states */
List *rtable; /* range table */ List *rtable; /* range table */
} ExplainState; } ExplainState;
@ -69,18 +69,25 @@ ExplainQuery(Query *query, List *options, CommandDest dest)
memset(es, 0, sizeof(ExplainState)); memset(es, 0, sizeof(ExplainState));
/* parse options */ /* parse options */
es->printCost = 1; /* default */
while (options) { while (options) {
char *ostr = strVal(lfirst(options)); char *ostr = strVal(lfirst(options));
if (!strcasecmp(ostr, "cost")) if (!strcasecmp(ostr, "cost"))
es->printCost = 1; es->printCost = true;
else if (!strcasecmp(ostr, "full")) else if (!strcasecmp(ostr, "plan"))
es->printNodes = 1; es->printNodes = true;
else if (!strcasecmp(ostr, "full")) {
es->printCost = true;
es->printNodes = true;
}
else else
elog(WARN, "Unknown EXPLAIN option: %s", ostr); elog(WARN, "Unknown EXPLAIN option: %s", ostr);
options = lnext(options); options = lnext(options);
} }
if (!es->printCost && !es->printNodes)
es->printCost = true; /* default */
es->rtable = query->rtable; es->rtable = query->rtable;
if (es->printNodes) 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 * 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];"}, "end [transaction];"},
{ "explain", { "explain",
"explain the query execution plan", "explain the query execution plan",
"explain [with {cost|full}] <query>"}, "explain [with {cost|plan|full}] <query>"},
{ "fetch", { "fetch",
"retrieve tuples from a cursor", "retrieve tuples from a cursor",
"fetch [forward|backward] [<number>|all] [in <cursorname>];"}, "fetch [forward|backward] [<number>|all] [in <cursorname>];"},

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