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Improve CASE statement support.

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Try to label CASE columns for a SELECT if not specified with an AS clause.
This commit is contained in:
Thomas G. Lockhart 1998-12-13 23:56:44 +00:00
parent 44cf948467
commit 2b189aa953
2 changed files with 22 additions and 16 deletions
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23
src/backend/parser/parse_expr.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.37 1998/12/04 15:34:30 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.38 1998/12/13 23:56:43 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -251,8 +251,7 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
{
/*
* look for a column name or a relation name (the default
* behavior)
* look for a column name or a relation name (the default behavior)
*/
result = transformIdent(pstate, expr, precedence);
break;
@ -358,13 +357,6 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
w->expr = (Node *)a;
}
lfirst(args) = transformExpr(pstate, (Node *) w, precedence);
if (w->result == NULL)
{
A_Const *n = makeNode(A_Const);
n->val.type = T_Null;
w->result = (Node *)n;
}
}
if (c->defresult == NULL)
@ -413,7 +405,7 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
}
}
/* Convert default clause, if necessary */
/* Convert default result clause, if necessary */
if (c->casetype != ptype)
{
if (! c->casetype)
@ -469,8 +461,13 @@ transformExpr(ParseState *pstate, Node *expr, int precedence)
elog(ERROR,"WHEN clause must have a boolean result");
/* result is NULL for NULLIF() construct - thomas 1998-11-11 */
if (w->result != NULL)
w->result = transformExpr(pstate, (Node *) w->result, precedence);
if (w->result == NULL)
{
A_Const *n = makeNode(A_Const);
n->val.type = T_Null;
w->result = (Node *)n;
}
w->result = transformExpr(pstate, (Node *) w->result, precedence);
result = expr;
break;
}

15
src/backend/parser/parse_target.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.31 1998/12/04 15:34:30 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.32 1998/12/13 23:56:44 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -32,7 +32,7 @@
static List *ExpandAllTables(ParseState *pstate);
static char *FigureColname(Node *expr, Node *resval);
char *FigureColname(Node *expr, Node *resval);
static Node *SizeTargetExpr(ParseState *pstate,
Node *expr,
@ -867,7 +867,7 @@ ExpandAllTables(ParseState *pstate)
* list, we have to guess.
*
*/
static char *
char *
FigureColname(Node *expr, Node *resval)
{
switch (nodeTag(expr))
@ -881,6 +881,15 @@ FigureColname(Node *expr, Node *resval)
return ((FuncCall *) resval)->funcname;
}
break;
case T_CaseExpr:
{
char *name;
name = FigureColname(((CaseExpr *) expr)->defresult, resval);
if (!strcmp(name, "?column?"))
name = "case";
return name;
}
break;
default:
break;
}