/*
* transformTargetList()
* Turns a list of ResTarget's into a list of TargetEntry's.
*
* This code acts mostly the same for SELECT, UPDATE, or RETURNING lists;
* the main thing is to transform the given expressions (the "val" fields).
* The exprKind parameter distinguishes these cases when necesssary.
*/
List *
transformTargetList(ParseState *pstate, List *targetlist,
ParseExprKind exprKind)
{
List *p_target = NIL;
ListCell *o_target;
/* Shouldn't have any leftover multiassign items at start */
Assert(pstate->p_multiassign_exprs == NIL);
foreach(o_target, targetlist)
{
ResTarget *res = (ResTarget *) lfirst(o_target);
/*
* Check for "something.*". Depending on the complexity of the
* "something", the star could appear as the last field in ColumnRef,
* or as the last indirection item in A_Indirection.
*/
if (IsA(res->val, ColumnRef))
{
ColumnRef *cref = (ColumnRef *) res->val;
if (IsA(llast(cref->fields), A_Star))
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandColumnRefStar(pstate, cref,
true));
continue;
}
}
else if (IsA(res->val, A_Indirection))
{
A_Indirection *ind = (A_Indirection *) res->val;
if (IsA(llast(ind->indirection), A_Star))
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandIndirectionStar(pstate, ind,
true, exprKind));
continue;
}
}
/*
* Not "something.*", so transform as a single expression
*/
p_target = lappend(p_target,
transformTargetEntry(pstate,
res->val,
NULL,
exprKind,
res->name,
false));
}
/*
* transformTargetList()
* Turns a list of ResTarget's into a list of TargetEntry's.
*
* At this point, we don't care whether we are doing SELECT, INSERT,
* or UPDATE; we just transform the given expressions (the "val" fields).
*/
List *
transformTargetList(ParseState *pstate, List *targetlist)
{
List *p_target = NIL;
ListCell *o_target;
foreach(o_target, targetlist)
{
ResTarget *res = (ResTarget *) lfirst(o_target);
/*
* Check for "something.*". Depending on the complexity of the
* "something", the star could appear as the last name in ColumnRef,
* or as the last indirection item in A_Indirection.
*/
if (IsA(res->val, ColumnRef))
{
ColumnRef *cref = (ColumnRef *) res->val;
if (strcmp(strVal(llast(cref->fields)), "*") == 0)
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandColumnRefStar(pstate, cref,
true));
continue;
}
}
else if (IsA(res->val, A_Indirection))
{
A_Indirection *ind = (A_Indirection *) res->val;
Node *lastitem = llast(ind->indirection);
if (IsA(lastitem, String) &&
strcmp(strVal(lastitem), "*") == 0)
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandIndirectionStar(pstate, ind,
true));
continue;
}
}
/*
* Not "something.*", so transform as a single expression
*/
p_target = lappend(p_target,
transformTargetEntry(pstate,
res->val,
NULL,
res->name,
false));
}
/*
* transformTargetList()
* Turns a list of ResTarget's into a list of TargetEntry's.
*
* At this point, we don't care whether we are doing SELECT, INSERT,
* or UPDATE; we just transform the given expressions (the "val" fields).
*/
List *
transformTargetList(ParseState *pstate, List *targetlist)
{
List *p_target = NIL;
ListCell *o_target;
ParseStateBreadCrumb savebreadcrumb;
/* CDB: Push error location stack. Must pop before return! */
Assert(pstate);
savebreadcrumb = pstate->p_breadcrumb;
pstate->p_breadcrumb.pop = &savebreadcrumb;
foreach(o_target, targetlist)
{
ResTarget *res = (ResTarget *) lfirst(o_target);
/* CDB: Drop a breadcrumb in case of error. */
pstate->p_breadcrumb.node = (Node *)res;
/*
* Check for "something.*". Depending on the complexity of the
* "something", the star could appear as the last name in ColumnRef,
* or as the last indirection item in A_Indirection.
*/
if (IsA(res->val, ColumnRef))
{
ColumnRef *cref = (ColumnRef *) res->val;
if (strcmp(strVal(llast(cref->fields)), "*") == 0)
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandColumnRefStar(pstate, cref,
true));
continue;
}
}
else if (IsA(res->val, A_Indirection))
{
A_Indirection *ind = (A_Indirection *) res->val;
Node *lastitem = llast(ind->indirection);
if (IsA(lastitem, String) &&
strcmp(strVal(lastitem), "*") == 0)
{
/* It is something.*, expand into multiple items */
p_target = list_concat(p_target,
ExpandIndirectionStar(pstate, ind,
true));
continue;
}
}
/*
* Not "something.*", so transform as a single expression
*/
p_target = lappend(p_target,
transformTargetEntry(pstate,
res->val,
NULL,
res->name,
false));
}
