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New QUERY_LIMIT set command.
This commit is contained in:
Bruce Momjian
parent
39f2ec55d7
commit
8cec4cf91b
@ -415,6 +415,44 @@ Equivalent to specifying <command>SET R_PLANS=Off</command>.
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The frontend may be initialized by setting the PGRPLANS
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environment variable.
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<varlistentry>
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<term>
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QUERY_LIMIT
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</term>
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<listitem>
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<para>
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Sets the number of rows returned by a query.
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<variablelist>
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<varlistentry>
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<term>
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Value
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</term>
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<listitem>
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<para>
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Maximum number of rows to return for a query. The default is unlimited.
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<varlistentry>
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<term>
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<replaceable class="parameter">#</replaceable>
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</term>
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<listitem>
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<para>
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Sets the maximum number of rows returned by a
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query to <replaceable class="parameter">#</replaceable>.
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<varlistentry>
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<term>
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DEFAULT
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</term>
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<listitem>
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<para>
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Sets the number of rows returned by a query to unlimited.
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</varlistentry>
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<para>
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By default, there is no limit to the number of rows
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returned by a query.
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</variablelist>
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</VARLISTENTRY>
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</VARIABLELIST>
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</REFSECT2>
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@ -2,7 +2,7 @@
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* Routines for handling of 'SET var TO',
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* 'SHOW var' and 'RESET var' statements.
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*
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* $Id: variable.c,v 1.15 1998/10/08 23:50:28 tgl Exp $
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* $Id: variable.c,v 1.16 1998/10/14 05:09:58 momjian Exp $
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*
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*/
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@ -18,6 +18,10 @@
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#ifdef MULTIBYTE
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#include "mb/pg_wchar.h"
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#endif
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#ifdef QUERY_LIMIT
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#include "executor/executor.h"
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#include "executor/execdefs.h"
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#endif
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static bool show_date(void);
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static bool reset_date(void);
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@ -40,6 +44,11 @@ static bool parse_geqo(const char *);
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static bool show_ksqo(void);
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static bool reset_ksqo(void);
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static bool parse_ksqo(const char *);
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#ifdef QUERY_LIMIT
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static bool show_query_limit(void);
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static bool reset_query_limit(void);
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static bool parse_query_limit(const char *);
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#endif
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extern Cost _cpu_page_wight_;
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extern Cost _cpu_index_page_wight_;
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@ -48,7 +57,11 @@ extern int32 _use_geqo_rels_;
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extern bool _use_right_sided_plans_;
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extern bool _use_keyset_query_optimizer;
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/*-----------------------------------------------------------------------*/
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/*
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*
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* Get_Token
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*
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*/
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static const char *
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get_token(char **tok, char **val, const char *str)
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{
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@ -149,7 +162,11 @@ get_token(char **tok, char **val, const char *str)
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return str;
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}
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/*-----------------------------------------------------------------------*/
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/*
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*
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* GEQO
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*
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*/
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static bool
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parse_geqo(const char *value)
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{
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@ -221,6 +238,11 @@ reset_geqo(void)
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return TRUE;
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}
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/*
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*
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* R_PLANS
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*
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*/
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static bool
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parse_r_plans(const char *value)
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{
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@ -240,7 +262,6 @@ parse_r_plans(const char *value)
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return TRUE;
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}
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/*-----------------------------------------------------------------------*/
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static bool
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show_r_plans()
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{
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@ -264,7 +285,11 @@ reset_r_plans()
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return TRUE;
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}
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/*-----------------------------------------------------------------------*/
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/*
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*
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* COST_HEAP
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*
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*/
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static bool
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parse_cost_heap(const char *value)
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{
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@ -297,7 +322,11 @@ reset_cost_heap()
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return TRUE;
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}
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/*-----------------------------------------------------------------------*/
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/*
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*
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* COST_INDEX
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*
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*/
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static bool
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parse_cost_index(const char *value)
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{
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@ -330,7 +359,11 @@ reset_cost_index()
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return TRUE;
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}
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/*-----------------------------------------------------------------------*/
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/*
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*
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* DATE_STYLE
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*
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*/
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static bool
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parse_date(const char *value)
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{
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@ -448,6 +481,11 @@ static char *defaultTZ = NULL;
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static char TZvalue[64];
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static char tzbuf[64];
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/*
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*
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* TIMEZONE
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*
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*/
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/* parse_timezone()
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* Handle SET TIME ZONE...
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* Try to save existing TZ environment variable for later use in RESET TIME ZONE.
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@ -545,7 +583,53 @@ reset_timezone()
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return TRUE;
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} /* reset_timezone() */
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/*
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*
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* Query_limit
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*
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*/
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#ifdef QUERY_LIMIT
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static bool
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parse_query_limit(const char *value)
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{
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int32 limit;
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if (value == NULL) {
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reset_query_limit();
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return(TRUE);
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}
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limit = pg_atoi(value, sizeof(int32), '\0');
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if (limit <= -1) {
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elog(ERROR, "Bad value for # of query limit (%s)", value);
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}
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ExecutorLimit(limit);
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return(TRUE);
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}
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static bool
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show_query_limit(void)
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{
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int limit;
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limit = ExecutorGetLimit();
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if (limit == ALL_TUPLES) {
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elog(NOTICE, "No query limit is set");
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} else {
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elog(NOTICE, "query limit is %d",limit);
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}
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return(TRUE);
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}
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static bool
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reset_query_limit(void)
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{
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ExecutorLimit(ALL_TUPLES);
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return(TRUE);
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}
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#endif
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/*-----------------------------------------------------------------------*/
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struct VariableParsers
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{
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const char *name;
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@ -584,6 +668,11 @@ struct VariableParsers
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{
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"ksqo", parse_ksqo, show_ksqo, reset_ksqo
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},
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#ifdef QUERY_LIMIT
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{
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"query_limit", parse_query_limit, show_query_limit, reset_query_limit
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},
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#endif
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{
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NULL, NULL, NULL, NULL
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}
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@ -26,7 +26,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.57 1998/10/01 02:03:58 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/executor/execMain.c,v 1.58 1998/10/14 05:10:00 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -83,14 +83,18 @@ static int queryLimit = ALL_TUPLES;
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#undef ALL_TUPLES
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#define ALL_TUPLES queryLimit
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int ExecutorLimit(int limit);
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int
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ExecutorLimit(int limit)
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{
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return queryLimit = limit;
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}
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int
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ExecutorGetLimit()
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{
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return queryLimit;
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}
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#endif
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/* ----------------------------------------------------------------
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@ -5,7 +5,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: psqlHelp.h,v 1.53 1998/10/08 01:10:28 tgl Exp $
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* $Id: psqlHelp.h,v 1.54 1998/10/14 05:10:02 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -296,10 +296,10 @@ static struct _helpStruct QL_HELP[] = {
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"set run-time environment back to default",
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#ifdef MULTIBYTE
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"\
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\tRESET DateStyle|GEQO|R_PLANS|CLIENT_ENCODING"},
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\tRESET DateStyle|GEQO|R_PLANS|QUERY_LIMIT|CLIENT_ENCODING"},
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#else
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"\
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\tRESET DateStyle|GEQO|R_PLANS"},
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\tRESET DateStyle|GEQO|R_PLANS|QUERY_LIMIT"},
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#endif
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{"revoke",
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"revoke access control from a user or group",
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@ -329,21 +329,23 @@ static struct _helpStruct QL_HELP[] = {
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\tSET DateStyle TO 'ISO'|'SQL'|'Postgres'|'European'|'US'|'NonEuropean'\n\
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set GEQO TO 'ON[=#]'|'OFF'\n\
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set R_PLANS TO 'ON'|'OFF'\n\
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set QUERY_LIMIT TO #\n\
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set CLIENT_ENCODING TO 'EUC_JP'|'SJIS'|'EUC_CN'|'EUC_KR'|'EUC_TW'|'MULE_INTERNAL'|'LATIN1'|'LATIN2'|'LATIN3'|'LATIN4'|'LATIN5'"},
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#else
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"\
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\tSET DateStyle TO 'ISO'|'SQL'|'Postgres'|'European'|'US'|'NonEuropean'\n\
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set GEQO TO 'ON[=#]'|'OFF'\n\
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set R_PLANS TO 'ON'| 'OFF'"},
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set R_PLANS TO 'ON'| 'OFF'\n\
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set QUERY_LIMIT TO #"},
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#endif
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{"show",
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"show current run-time environment",
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#ifdef MULTIBYTE
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"\
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\tSHOW DateStyle|GEQO|R_PLANS|CLIENT_ENCODING"},
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\tSHOW DateStyle|GEQO|R_PLANS|QUERY_LIMIT|CLIENT_ENCODING"},
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#else
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"\
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\tSHOW DateStyle|GEQO|R_PLANS"},
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\tSHOW DateStyle|GEQO|R_PLANS|QUERY_LIMIT"},
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#endif
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{"unlisten",
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"stop listening for notification on a condition name",
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: executor.h,v 1.26 1998/10/08 18:30:29 momjian Exp $
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* $Id: executor.h,v 1.27 1998/10/14 05:10:05 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -86,6 +86,10 @@ extern TupleDesc ExecutorStart(QueryDesc *queryDesc, EState *estate);
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extern TupleTableSlot *ExecutorRun(QueryDesc *queryDesc, EState *estate, int feature, int count);
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extern void ExecutorEnd(QueryDesc *queryDesc, EState *estate);
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extern HeapTuple ExecConstraints(char *caller, Relation rel, HeapTuple tuple);
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#ifdef QUERY_LIMIT
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extern int ExecutorLimit(int limit);
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extern int ExecutorGetLimit(void);
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#endif
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/*
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* prototypes from functions in execProcnode.c
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@ -1,6 +1,6 @@
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.\" This is -*-nroff-*-
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.\" XXX standard disclaimer belongs here....
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.\" $Header: /cvsroot/pgsql/src/man/Attic/set.l,v 1.10 1998/10/14 02:36:44 momjian Exp $
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.\" $Header: /cvsroot/pgsql/src/man/Attic/set.l,v 1.11 1998/10/14 05:10:12 momjian Exp $
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.TH SET SQL 05/14/97 PostgreSQL PostgreSQL
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.SH NAME
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set - set run-time parameters for session
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@ -76,6 +76,12 @@ by default. It's not used by GEQO anyway.
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off - do not use right-hand plan evaluation
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.fi
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.PP
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.IR QUERY_LIMIT
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restricts the number of rows returned by a query.
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The default is unlimited.
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.SH EXAMPLES
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.nf
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--
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