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Subselects in FROM clause, per ISO syntax: FROM (SELECT ...) [AS] alias.

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(Don't forget that an alias is required.)  Views reimplemented as expanding
to subselect-in-FROM.  Grouping, aggregates, DISTINCT in views actually
work now (he says optimistically).  No UNION support in subselects/views
yet, but I have some ideas about that.  Rule-related permissions checking
moved out of rewriter and into executor.
INITDB REQUIRED!
This commit is contained in:
Tom Lane
2000-09-29 18:21:41 +00:00
parent 6f64c2e54a
commit 3a94e789f5
77 changed files with 3176 additions and 2661 deletions
Download Patch File Download Diff File Expand all files Collapse all files

131
src/backend/commands/explain.c
View File

@ -5,7 +5,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.58 2000/09/12 21:06:47 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/explain.c,v 1.59 2000/09/29 18:21:26 tgl Exp $
*
*/
@ -176,6 +176,12 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
case T_IndexScan:
pname = "Index Scan";
break;
case T_TidScan:
pname = "Tid Scan";
break;
case T_SubqueryScan:
pname = "Subquery Scan";
break;
case T_Material:
pname = "Materialize";
break;
@ -194,9 +200,6 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
case T_Hash:
pname = "Hash";
break;
case T_TidScan:
pname = "Tid Scan";
break;
default:
pname = "???";
break;
@ -225,37 +228,27 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
case T_TidScan:
if (((Scan *) plan)->scanrelid > 0)
{
RangeTblEntry *rte = nth(((Scan *) plan)->scanrelid - 1, es->rtable);
RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
es->rtable);
/* Assume it's on a real relation */
Assert(rte->relname);
appendStringInfo(str, " on %s",
stringStringInfo(rte->relname));
if (rte->alias != NULL)
{
if ((strcmp(rte->alias->relname, rte->relname) != 0)
|| (length(rte->alias->attrs) > 0))
{
appendStringInfo(str, " %s",
stringStringInfo(rte->alias->relname));
if (strcmp(rte->eref->relname, rte->relname) != 0)
appendStringInfo(str, " %s",
stringStringInfo(rte->eref->relname));
}
break;
case T_SubqueryScan:
if (((Scan *) plan)->scanrelid > 0)
{
RangeTblEntry *rte = rt_fetch(((Scan *) plan)->scanrelid,
es->rtable);
if (length(rte->alias->attrs) > 0)
{
List *c;
int firstEntry = true;
appendStringInfo(str, " (");
foreach(c, rte->alias->attrs)
{
if (!firstEntry)
{
appendStringInfo(str, ", ");
firstEntry = false;
}
appendStringInfo(str, "%s", strVal(lfirst(c)));
}
appendStringInfo(str, ")");
}
}
}
appendStringInfo(str, " %s",
stringStringInfo(rte->eref->relname));
}
break;
default:
@ -284,7 +277,8 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " -> ");
explain_outNode(str, ((SubPlan *) lfirst(lst))->plan, indent + 2, es);
explain_outNode(str, ((SubPlan *) lfirst(lst))->plan,
indent + 4, es);
}
es->rtable = saved_rtable;
}
@ -307,32 +301,12 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
explain_outNode(str, innerPlan(plan), indent + 3, es);
}
/* subPlan-s */
if (plan->subPlan)
if (IsA(plan, Append))
{
List *saved_rtable = es->rtable;
List *lst;
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " SubPlan\n");
foreach(lst, plan->subPlan)
{
es->rtable = ((SubPlan *) lfirst(lst))->rtable;
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " -> ");
explain_outNode(str, ((SubPlan *) lfirst(lst))->plan, indent + 4, es);
}
es->rtable = saved_rtable;
}
if (nodeTag(plan) == T_Append)
{
List *saved_rtable = es->rtable;
List *lst;
int whichplan = 0;
Append *appendplan = (Append *) plan;
List *saved_rtable = es->rtable;
int whichplan = 0;
List *lst;
foreach(lst, appendplan->appendplans)
{
@ -351,14 +325,55 @@ explain_outNode(StringInfo str, Plan *plan, int indent, ExplainState *es)
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " -> ");
appendStringInfo(str, " -> ");
explain_outNode(str, subnode, indent + 4, es);
explain_outNode(str, subnode, indent + 3, es);
whichplan++;
}
es->rtable = saved_rtable;
}
if (IsA(plan, SubqueryScan))
{
SubqueryScan *subqueryscan = (SubqueryScan *) plan;
Plan *subnode = subqueryscan->subplan;
RangeTblEntry *rte = rt_fetch(subqueryscan->scan.scanrelid,
es->rtable);
List *saved_rtable = es->rtable;
Assert(rte->subquery != NULL);
es->rtable = rte->subquery->rtable;
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " -> ");
explain_outNode(str, subnode, indent + 3, es);
es->rtable = saved_rtable;
}
/* subPlan-s */
if (plan->subPlan)
{
List *saved_rtable = es->rtable;
List *lst;
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " SubPlan\n");
foreach(lst, plan->subPlan)
{
es->rtable = ((SubPlan *) lfirst(lst))->rtable;
for (i = 0; i < indent; i++)
appendStringInfo(str, " ");
appendStringInfo(str, " -> ");
explain_outNode(str, ((SubPlan *) lfirst(lst))->plan,
indent + 4, es);
}
es->rtable = saved_rtable;
}
}
static char *