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Commitc3ec548

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committed
Add store and exec plan functions
1 parent65cc9d9 commitc3ec548

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3 files changed

+193
-1
lines changed

3 files changed

+193
-1
lines changed

‎init.sql

Lines changed: 10 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,14 @@
11
\echo Use"CREATE EXTENSION pg_execplan" to load this file. \quit
22

3-
CREATEOR REPLACE FUNCTION @extschema@.pg_store_query_plan(queryTEXT)
3+
-- Store plan of a query into a text file.
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-- query - query string which will be parsed and planned.
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-- filename - path to the file on a disk.
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CREATEOR REPLACE FUNCTION @extschema@.pg_store_query_plan(
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queryTEXT,
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filenameTEXT)
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RETURNS VOIDAS'pg_execplan'
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LANGUAGE C;
11+
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CREATEOR REPLACE FUNCTION @extschema@.pg_exec_query_plan(filenameTEXT)
413
RETURNS VOIDAS'pg_execplan'
514
LANGUAGE C;

‎pg_execplan.c

Lines changed: 177 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,177 @@
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/*
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* pg_execplan.c
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*
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*/
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#include"postgres.h"
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#include"access/printtup.h"
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#include"commands/extension.h"
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#include"commands/prepare.h"
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#include"executor/executor.h"
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#include"nodes/plannodes.h"
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#include"tcop/pquery.h"
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#include"tcop/utility.h"
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#include"utils/builtins.h"
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#include"utils/memutils.h"
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#include"utils/plancache.h"
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#include"utils/snapmgr.h"
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#defineEXPLAN_DEBUG_LEVEL 0
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(pg_store_query_plan);
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PG_FUNCTION_INFO_V1(pg_exec_query_plan);
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void_PG_init(void);
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/*
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* Module load/unload callback
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*/
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void
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_PG_init(void)
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{
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return;
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}
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Datum
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pg_store_query_plan(PG_FUNCTION_ARGS)
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{
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char*query_string=TextDatumGetCString(PG_GETARG_DATUM(1)),
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*filename=TextDatumGetCString(PG_GETARG_DATUM(0)),
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*plan_string;
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intnstmts;
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FILE*fout;
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MemoryContextoldcontext;
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List*parsetree_list;
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RawStmt*parsetree;
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List*querytree_list,
51+
*plantree_list;
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QueryDesc*queryDesc;
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size_tstring_len;
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if (EXPLAN_DEBUG_LEVEL>0)
56+
elog(LOG,"Store into %s plan of the query %s.",filename,query_string);
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oldcontext=MemoryContextSwitchTo(MessageContext);
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parsetree_list=pg_parse_query(query_string);
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nstmts=list_length(parsetree_list);
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if (nstmts!=1)
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elog(ERROR,"Query contains %d elements, but must contain only one.",nstmts);
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parsetree= (RawStmt*)linitial(parsetree_list);
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querytree_list=pg_analyze_and_rewrite(parsetree,query_string,NULL,0);
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plantree_list=pg_plan_queries(querytree_list,CURSOR_OPT_PARALLEL_OK,NULL);
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queryDesc=CreateQueryDesc((PlannedStmt*)linitial(plantree_list),
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query_string,
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InvalidSnapshot,
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InvalidSnapshot,
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None_Receiver,
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0,
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0);
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if (EXPLAN_DEBUG_LEVEL>0)
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elog(INFO,"BEFORE writing %s ...",filename);
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fout=fopen(filename,"wb");
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Assert(fout!=NULL);
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string_len=strlen(query_string);
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fwrite(&string_len,sizeof(size_t),1,fout);
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fwrite(query_string,sizeof(char),string_len,fout);
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plan_string=nodeToString(queryDesc->plannedstmt);
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string_len=strlen(plan_string);
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fwrite(&string_len,sizeof(size_t),1,fout);
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fwrite(plan_string,sizeof(char),string_len,fout);
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fclose(fout);
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MemoryContextSwitchTo(oldcontext);
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PG_RETURN_VOID();
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}
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staticvoid
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LoadPlanFromFile(constchar*filename,char**query_string,char**plan_string)
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{
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FILE*fin;
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size_tstring_len;
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intnelems;
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fin=fopen(filename,"rb");
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Assert(fin!=NULL);
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nelems=fread(&string_len,sizeof(size_t),1,fin);
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Assert(nelems==1);
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*query_string=palloc0(string_len+1);
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nelems=fread(*query_string,sizeof(char),string_len,fin);
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Assert(nelems==string_len);
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nelems=fread(&string_len,sizeof(size_t),1,fin);
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Assert(nelems==1);
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*plan_string=palloc0(string_len+1);
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nelems=fread(*plan_string,sizeof(char),string_len,fin);
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Assert(nelems==string_len);
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fclose(fin);
119+
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}
121+
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Datum
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pg_exec_query_plan(PG_FUNCTION_ARGS)
124+
{
125+
char*filename=TextDatumGetCString(PG_GETARG_DATUM(0)),
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*query_string=NULL,
127+
*plan_string=NULL;
128+
PlannedStmt*pstmt;
129+
ParamListInfoparamLI=NULL;
130+
CachedPlanSource*psrc;
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CachedPlan*cplan;
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Portalportal;
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DestReceiver*receiver;
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int16format=0;
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inteflags=0;
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LoadPlanFromFile(filename,&query_string,&plan_string);
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pstmt= (PlannedStmt*)stringToNode(plan_string);
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psrc=CreateCachedPlan(NULL,query_string,query_string);
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CompleteCachedPlan(psrc,NIL,NULL,NULL,0,NULL,NULL,
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CURSOR_OPT_GENERIC_PLAN, false);
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StorePreparedStatement(query_string,psrc, false);
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SetRemoteSubplan(psrc,pstmt);
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cplan=GetCachedPlan(psrc,paramLI, false);
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if (EXPLAN_DEBUG_LEVEL>0)
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elog(INFO,"query: %s\n",query_string);
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if (EXPLAN_DEBUG_LEVEL>1)
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elog(INFO,"\nplan: %s\n",plan_string);
151+
152+
receiver=CreateDestReceiver(DestDebug);
153+
portal=CreateNewPortal();
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portal->visible= false;
155+
PortalDefineQuery(portal,
156+
NULL,
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query_string,
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query_string,
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cplan->stmt_list,
160+
cplan);
161+
PortalStart(portal,paramLI,eflags,InvalidSnapshot);
162+
PortalSetResultFormat(portal,0,&format);
163+
(void)PortalRun(portal,
164+
FETCH_ALL,
165+
true,
166+
receiver,
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receiver,
168+
query_string);
169+
receiver->rDestroy(receiver);
170+
PortalDrop(portal, false);
171+
DropPreparedStatement(query_string, false);
172+
173+
if (EXPLAN_DEBUG_LEVEL>0)
174+
elog(INFO,"query execution finished.\n");
175+
176+
PG_RETURN_VOID();
177+
}

‎pg_execplan.control

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,6 @@
1+
# pg_execplan extension
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comment = 'Execute raw query plan on remote node'
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default_version = '0.1'
4+
module_pathname = '$libdir/pg_execplan'
5+
relocatable = false
6+
requires = 'postgres_fdw'

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