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Further tweaking of parsetree & plantree representation of SubLinks.

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Simplify SubLink by storing just a List of operator OIDs, instead of
a list of incomplete OpExprs --- that was a bizarre and bulky choice,
with no redeeming social value since we have to build new OpExprs
anyway when forming the plan tree.
This commit is contained in:
Tom Lane
2003-01-10 21:08:15 +00:00
parent 36ea26793a
commit e69785debf
17 changed files with 407 additions and 246 deletions
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58
src/backend/utils/adt/ruleutils.c
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@ -3,7 +3,7 @@
* back to source text
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.131 2003/01/09 20:50:52 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.132 2003/01/10 21:08:15 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -167,6 +167,7 @@ static bool tleIsArrayAssign(TargetEntry *tle);
static char *generate_relation_name(Oid relid);
static char *generate_function_name(Oid funcid, int nargs, Oid *argtypes);
static char *generate_operator_name(Oid operid, Oid arg1, Oid arg2);
static void print_operator_name(StringInfo buf, List *opname);
static char *get_relid_attribute_name(Oid relid, AttrNumber attnum);
#define only_marker(rte) ((rte)->inh ? "" : "ONLY ")
@ -2111,7 +2112,10 @@ get_rule_expr(Node *node, deparse_context *context,
* rule deparsing, only while EXPLAINing a query
* plan. For now, just punt.
*/
appendStringInfo(buf, "(subplan)");
if (((SubPlan *) node)->useHashTable)
appendStringInfo(buf, "(hashed subplan)");
else
appendStringInfo(buf, "(subplan)");
}
break;
@ -2619,7 +2623,6 @@ get_sublink_expr(SubLink *sublink, deparse_context *context)
Query *query = (Query *) (sublink->subselect);
List *l;
char *sep;
OpExpr *oper;
bool need_paren;
appendStringInfoChar(buf, '(');
@ -2647,11 +2650,10 @@ get_sublink_expr(SubLink *sublink, deparse_context *context)
need_paren = true;
/*
* XXX we assume here that we can get away without qualifying the
* operator name. Since the name may imply multiple physical
* operators it's rather difficult to do otherwise --- in fact, if the
* operators are in different namespaces any attempt to qualify would
* surely fail.
* XXX we regurgitate the originally given operator name, with or without
* schema qualification. This is not necessarily 100% right but it's
* the best we can do, since the operators actually used might not all
* be in the same schema.
*/
switch (sublink->subLinkType)
{
@ -2660,26 +2662,27 @@ get_sublink_expr(SubLink *sublink, deparse_context *context)
break;
case ANY_SUBLINK:
if (sublink->operIsEquals)
if (length(sublink->operName) == 1 &&
strcmp(strVal(lfirst(sublink->operName)), "=") == 0)
{
/* Represent it as IN */
/* Represent = ANY as IN */
appendStringInfo(buf, "IN ");
}
else
{
oper = (OpExpr *) lfirst(sublink->oper);
appendStringInfo(buf, "%s ANY ", get_opname(oper->opno));
print_operator_name(buf, sublink->operName);
appendStringInfo(buf, " ANY ");
}
break;
case ALL_SUBLINK:
oper = (OpExpr *) lfirst(sublink->oper);
appendStringInfo(buf, "%s ALL ", get_opname(oper->opno));
print_operator_name(buf, sublink->operName);
appendStringInfo(buf, " ALL ");
break;
case MULTIEXPR_SUBLINK:
oper = (OpExpr *) lfirst(sublink->oper);
appendStringInfo(buf, "%s ", get_opname(oper->opno));
print_operator_name(buf, sublink->operName);
appendStringInfoChar(buf, ' ');
break;
case EXPR_SUBLINK:
@ -3274,6 +3277,29 @@ generate_operator_name(Oid operid, Oid arg1, Oid arg2)
return buf.data;
}
/*
* Print out a possibly-qualified operator name
*/
static void
print_operator_name(StringInfo buf, List *opname)
{
int nnames = length(opname);
if (nnames == 1)
appendStringInfo(buf, "%s", strVal(lfirst(opname)));
else
{
appendStringInfo(buf, "OPERATOR(");
while (nnames-- > 1)
{
appendStringInfo(buf, "%s.",
quote_identifier(strVal(lfirst(opname))));
opname = lnext(opname);
}
appendStringInfo(buf, "%s)", strVal(lfirst(opname)));
}
}
/*
* get_relid_attribute_name
* Get an attribute name by its relations Oid and its attnum