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First cut at full support for OUTER JOINs. There are still a few loose

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ends to clean up (see my message of same date to pghackers), but mostly
it works.  INITDB REQUIRED!
This commit is contained in:
Tom Lane
2000-09-12 21:07:18 +00:00
parent b5c0ab278b
commit ed5003c584
93 changed files with 6386 additions and 4262 deletions
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117
src/backend/parser/parse_func.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.89 2000/08/24 03:29:05 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.90 2000/09/12 21:07:02 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -64,19 +64,20 @@ static Oid agg_select_candidate(Oid typeid, CandidateList candidates);
** a tree with of Iter and Func nodes.
*/
Node *
ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr, int *curr_resno, int precedence)
ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr, int precedence)
{
List *mutator_iter;
Node *retval = NULL;
if (attr->paramNo != NULL)
{
Param *param = (Param *) transformExpr(pstate, (Node *) attr->paramNo, EXPR_RELATION_FIRST);
Param *param = (Param *) transformExpr(pstate,
(Node *) attr->paramNo,
EXPR_RELATION_FIRST);
retval = ParseFuncOrColumn(pstate, strVal(lfirst(attr->attrs)),
lcons(param, NIL),
false, false,
curr_resno,
precedence);
}
else
@ -88,7 +89,6 @@ ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr, int *curr_resno, int pre
retval = ParseFuncOrColumn(pstate, strVal(lfirst(attr->attrs)),
lcons(ident, NIL),
false, false,
curr_resno,
precedence);
}
@ -98,7 +98,6 @@ ParseNestedFuncOrColumn(ParseState *pstate, Attr *attr, int *curr_resno, int pre
retval = ParseFuncOrColumn(pstate, strVal(lfirst(mutator_iter)),
lcons(retval, NIL),
false, false,
curr_resno,
precedence);
}
@ -241,17 +240,15 @@ agg_select_candidate(Oid typeid, CandidateList candidates)
Node *
ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
bool agg_star, bool agg_distinct,
int *curr_resno, int precedence)
int precedence)
{
Oid rettype = InvalidOid;
Oid argrelid = InvalidOid;
Oid funcid = InvalidOid;
List *i = NIL;
Node *first_arg = NULL;
char *relname = NULL;
char *refname = NULL;
char *refname;
Relation rd;
Oid relid;
int nargs = length(fargs);
Func *funcnode;
Oid oid_array[FUNC_MAX_ARGS];
@ -283,81 +280,17 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
if (IsA(first_arg, Ident) && ((Ident *) first_arg)->isRel)
{
Ident *ident = (Ident *) first_arg;
RangeTblEntry *rte;
AttrNumber attnum;
/*
* first arg is a relation. This could be a projection.
*/
refname = ident->name;
rte = refnameRangeTableEntry(pstate, refname);
if (rte == NULL)
{
rte = addRangeTableEntry(pstate, refname,
makeAttr(refname, NULL),
FALSE, FALSE, TRUE);
warnAutoRange(pstate, refname);
}
retval = qualifiedNameToVar(pstate, refname, funcname, true);
if (retval)
return retval;
relname = rte->relname;
relid = rte->relid;
attnum = InvalidAttrNumber;
/*
* If the attr isn't a set, just make a var for it. If it is
* a set, treat it like a function and drop through. Look
* through the explicit column list first, since we now allow
* column aliases. - thomas 2000-02-07
*/
if (rte->eref->attrs != NULL)
{
List *c;
/*
* start counting attributes/columns from one. zero is
* reserved for InvalidAttrNumber. - thomas 2000-01-27
*/
int i = 1;
foreach(c, rte->eref->attrs)
{
char *colname = strVal(lfirst(c));
/* found a match? */
if (strcmp(colname, funcname) == 0)
{
char *basename = get_attname(relid, i);
if (basename != NULL)
{
funcname = basename;
attnum = i;
}
/*
* attnum was initialized to InvalidAttrNumber
* earlier, so no need to reset it if the above
* test fails. - thomas 2000-02-07
*/
break;
}
i++;
}
if (attnum == InvalidAttrNumber)
attnum = specialAttNum(funcname);
}
else
attnum = get_attnum(relid, funcname);
if (attnum != InvalidAttrNumber)
{
return (Node *) make_var(pstate,
relid,
refname,
funcname);
}
/* else drop through - attr is a set */
/* else drop through - attr is a set or function */
}
else if (ISCOMPLEX(exprType(first_arg)))
{
@ -376,10 +309,7 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
toid = exprType(first_arg);
rd = heap_openr_nofail(typeidTypeName(toid));
if (RelationIsValid(rd))
{
relname = RelationGetRelationName(rd);
heap_close(rd, NoLock);
}
else
elog(ERROR, "Type '%s' is not a relation type",
typeidTypeName(toid));
@ -506,17 +436,9 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
rte = refnameRangeTableEntry(pstate, refname);
if (rte == NULL)
{
rte = addRangeTableEntry(pstate, refname,
makeAttr(refname, NULL),
FALSE, FALSE, TRUE);
warnAutoRange(pstate, refname);
}
rte = addImplicitRTE(pstate, refname);
relname = rte->relname;
vnum = refnameRangeTablePosn(pstate, rte->eref->relname,
&sublevels_up);
vnum = RTERangeTablePosn(pstate, rte, &sublevels_up);
/*
* for func(relname), the param to the function is the tuple
@ -525,7 +447,8 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
* but has varattno == 0 to signal that the whole tuple is the
* argument.
*/
toid = typeTypeId(typenameType(relname));
toid = typeTypeId(typenameType(rte->relname));
/* replace it in the arg list */
lfirst(i) = makeVar(vnum, 0, toid, -1, sublevels_up);
}
@ -666,16 +589,6 @@ ParseFuncOrColumn(ParseState *pstate, char *funcname, List *fargs,
/* perform the necessary typecasting of arguments */
make_arguments(pstate, nargs, fargs, oid_array, true_oid_array);
/*
* Special checks to disallow sequence functions with side-effects
* in WHERE clauses. This is pretty much of a hack; why disallow these
* when we have no way to check for side-effects of user-defined fns?
*/
if (funcid == F_NEXTVAL && pstate->p_in_where_clause)
elog(ERROR, "Sequence function nextval is not allowed in WHERE clauses");
if (funcid == F_SETVAL && pstate->p_in_where_clause)
elog(ERROR, "Sequence function setval is not allowed in WHERE clauses");
expr = makeNode(Expr);
expr->typeOid = rettype;
expr->opType = FUNC_EXPR;