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Implement CASE expression.

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This commit is contained in:
Thomas G. Lockhart
1998-12-04 15:34:49 +00:00
parent 19740e2fff
commit bedd04a551
17 changed files with 779 additions and 110 deletions
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34
src/backend/optimizer/util/tlist.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/tlist.c,v 1.20 1998/09/22 21:48:27 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/tlist.c,v 1.21 1998/12/04 15:34:15 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -482,7 +482,6 @@ flatten_tlistentry(Node *tlistentry, List *flat_tlist)
flatten_tlistentry(lfirst(elt), flat_tlist));
return ((Node *) make_funcclause((Func *) expr->oper, temp_result));
}
else if (IsA(tlistentry, Aggreg))
{
@@ -509,19 +508,36 @@ flatten_tlistentry(Node *tlistentry, List *flat_tlist)
return tlistentry;
}
else if (case_clause(tlistentry))
{
CaseExpr *cexpr = (CaseExpr *) tlistentry;
CaseWhen *cwhen;
List *elt = NIL;
foreach(elt, cexpr->args)
cwhen = (CaseWhen *)lfirst(elt);
cwhen->result = flatten_tlistentry(cwhen->result, flat_tlist);
cexpr->defresult = flatten_tlistentry(cexpr->defresult, flat_tlist);
return ((Node *) cexpr);
}
else
{
Expr *expr = (Expr *) tlistentry;
Var *left = (Var *) flatten_tlistentry((Node *) get_leftop(expr),
flat_tlist);
Var *right = (Var *) flatten_tlistentry((Node *) get_rightop(expr),
flat_tlist);
Expr *final = make_opclause((Oper *) expr->oper, left, right);
Expr *expr, *final;
Var *left, *right;
Assert(IsA(tlistentry, Expr));
expr = (Expr *) tlistentry;
left = (Var *) flatten_tlistentry((Node *) get_leftop(expr),
flat_tlist);
right = (Var *) flatten_tlistentry((Node *) get_rightop(expr),
flat_tlist);
final = make_opclause((Oper *) expr->oper, left, right);
final->opType = expr->opType;
final->typeOid = expr->typeOid;
return (Node *)final;
}
}