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Further tweaks to support display of sort keys in EXPLAIN --- initial 

implementation didn't work for Sort nodes associated with Append plans.
This commit is contained in:
Tom Lane 2002-06-13 03:40:49 +00:00
parent 59c325bb73
commit ecb5269404
3 changed files with 39 additions and 34 deletions
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35
src/backend/commands/explain.c
View File

@ -5,7 +5,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.78 2002/05/18 21:38:40 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.79 2002/06/13 03:40:49 tgl Exp $
*
*/
@ -681,7 +681,8 @@ show_scan_qual(List *qual, bool is_or_qual, const char *qlabel,
outercontext = NULL;
context = deparse_context_for_plan(scanrelid, scancontext,
OUTER, outercontext);
OUTER, outercontext,
NIL);
/* Deparse the expression */
exprstr = deparse_expression(node, context, (outercontext != NULL));
@ -726,7 +727,8 @@ show_upper_qual(List *qual, const char *qlabel,
else
innercontext = NULL;
context = deparse_context_for_plan(outer_varno, outercontext,
inner_varno, innercontext);
inner_varno, innercontext,
NIL);
/* Deparse the expression */
node = (Node *) make_ands_explicit(qual);
@ -761,11 +763,30 @@ show_sort_keys(List *tlist, int nkeys, const char *qlabel,
/*
* In this routine we expect that the plan node's tlist has not been
* processed by set_plan_references(), so any Vars will contain valid
* varnos referencing the actual rtable.
* processed by set_plan_references(). Normally, any Vars will contain
* valid varnos referencing the actual rtable. But we might instead be
* looking at a dummy tlist generated by prepunion.c; if there are
* Vars with zero varno, use the tlist itself to determine their names.
*/
context = deparse_context_from_rtable(es->rtable);
useprefix = length(es->rtable) > 1;
if (intMember(0, pull_varnos((Node *) tlist)))
{
Node *outercontext;
outercontext = deparse_context_for_subplan("sort",
tlist,
es->rtable);
context = deparse_context_for_plan(0, outercontext,
0, NULL,
NIL);
useprefix = false;
}
else
{
context = deparse_context_for_plan(0, NULL,
0, NULL,
es->rtable);
useprefix = length(es->rtable) > 1;
}
for (keyno = 1; keyno <= nkeys; keyno++)
{

32
src/backend/utils/adt/ruleutils.c
View File

@ -3,7 +3,7 @@
* back to source text
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.107 2002/05/28 22:16:15 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.108 2002/06/13 03:40:49 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -685,16 +685,21 @@ deparse_context_for(const char *aliasname, Oid relid)
* The passed-in Nodes should be made using deparse_context_for_subplan
* and/or deparse_context_for_relation. The resulting context will work
* for deparsing quals, tlists, etc of the plan node.
*
* An rtable list can also be passed in case plain Vars might be seen.
* This is not needed for true upper-level expressions, but is helpful for
* Sort nodes and similar cases with slightly bogus targetlists.
*/
List *
deparse_context_for_plan(int outer_varno, Node *outercontext,
int inner_varno, Node *innercontext)
int inner_varno, Node *innercontext,
List *rtable)
{
deparse_namespace *dpns;
dpns = (deparse_namespace *) palloc(sizeof(deparse_namespace));
dpns->rtable = NIL;
dpns->rtable = rtable;
dpns->outer_varno = outer_varno;
dpns->outer_rte = (RangeTblEntry *) outercontext;
dpns->inner_varno = inner_varno;
@ -779,27 +784,6 @@ deparse_context_for_subplan(const char *name, List *tlist,
return (Node *) rte;
}
/*
* deparse_context_from_rtable - Build deparse context given a rangetable
*
* This is suitable for deparsing expressions that refer to only a single
* level of variables (no outer-reference Vars).
*/
List *
deparse_context_from_rtable(List *rtable)
{
deparse_namespace *dpns;
dpns = (deparse_namespace *) palloc(sizeof(deparse_namespace));
dpns->rtable = rtable;
dpns->outer_varno = dpns->inner_varno = 0;
dpns->outer_rte = dpns->inner_rte = NULL;
/* Return a one-deep namespace stack */
return makeList1(dpns);
}
/* ----------
* make_ruledef - reconstruct the CREATE RULE command
* for a given pg_rewrite tuple

6
src/include/utils/builtins.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: builtins.h,v 1.183 2002/06/11 15:41:38 thomas Exp $
* $Id: builtins.h,v 1.184 2002/06/13 03:40:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -354,11 +354,11 @@ extern char *deparse_expression(Node *expr, List *dpcontext,
bool forceprefix);
extern List *deparse_context_for(const char *aliasname, Oid relid);
extern List *deparse_context_for_plan(int outer_varno, Node *outercontext,
int inner_varno, Node *innercontext);
int inner_varno, Node *innercontext,
List *rtable);
extern Node *deparse_context_for_rte(RangeTblEntry *rte);
extern Node *deparse_context_for_subplan(const char *name, List *tlist,
List *rtable);
extern List *deparse_context_from_rtable(List *rtable);
extern const char *quote_identifier(const char *ident);
extern char *quote_qualified_identifier(const char *namespace,
const char *ident);