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Add a line to the EXPLAIN ANALYZE output for a Sort node, showing the

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actual sort strategy and amount of space used.  By popular demand.
This commit is contained in:
Tom Lane
2007-05-04 21:29:53 +00:00
parent c7464720a3
commit d2a4a4069f
3 changed files with 94 additions and 3 deletions
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29
src/backend/commands/explain.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.162 2007/04/27 22:05:47 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.163 2007/05/04 21:29:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -30,6 +30,7 @@
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/tuplesort.h"
typedef struct ExplainState
@ -58,6 +59,8 @@ static void show_upper_qual(List *qual, const char *qlabel, Plan *plan,
static void show_sort_keys(Plan *sortplan, int nkeys, AttrNumber *keycols,
const char *qlabel,
StringInfo str, int indent, ExplainState *es);
static void show_sort_info(SortState *sortstate,
StringInfo str, int indent, ExplainState *es);
/*
* ExplainQuery -
@ -818,6 +821,8 @@ explain_outNode(StringInfo str,
((Sort *) plan)->sortColIdx,
"Sort Key",
str, indent, es);
show_sort_info((SortState *) planstate,
str, indent, es);
break;
case T_Result:
show_upper_qual((List *) ((Result *) plan)->resconstantqual,
@ -1123,3 +1128,25 @@ show_sort_keys(Plan *sortplan, int nkeys, AttrNumber *keycols,
appendStringInfo(str, "\n");
}
/*
* If it's EXPLAIN ANALYZE, show tuplesort explain info for a sort node
*/
static void
show_sort_info(SortState *sortstate,
StringInfo str, int indent, ExplainState *es)
{
Assert(IsA(sortstate, SortState));
if (es->printAnalyze && sortstate->sort_Done &&
sortstate->tuplesortstate != NULL)
{
char *sortinfo;
int i;
sortinfo = tuplesort_explain((Tuplesortstate *) sortstate->tuplesortstate);
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " %s\n", sortinfo);
pfree(sortinfo);
}
}