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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/include/nodes/parsenodes.h
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@@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: parsenodes.h,v 1.61 1998/10/22 13:52:24 momjian Exp $
* $Id: parsenodes.h,v 1.62 1998/12/04 15:34:44 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -713,6 +713,28 @@ typedef struct A_Const
TypeName *typename; /* typecast */
} A_Const;
/*
* CaseExpr - a CASE expression
*/
typedef struct CaseExpr
{
NodeTag type;
Oid casetype;
Node *arg; /* implicit equality comparison argument */
List *args; /* the arguments (list of WHEN clauses) */
Node *defresult; /* the default result (ELSE clause) */
} CaseExpr;
/*
* CaseWhen - an argument to a CASE expression
*/
typedef struct CaseWhen
{
NodeTag type;
Node *expr; /* comparison expression */
Node *result; /* substitution result */
} CaseWhen;
/*
* ColumnDef - column definition (used in various creates)
*/
@@ -777,7 +799,7 @@ typedef struct ResTarget
} ResTarget;
/*
* ParamString - used in with clauses
* ParamString - used in WITH clauses
*/
typedef struct ParamString
{
@@ -797,7 +819,7 @@ typedef struct RelExpr
} RelExpr;
/*
* SortGroupBy - for order by clause
* SortGroupBy - for ORDER BY clause
*/
typedef struct SortGroupBy
{
@@ -807,7 +829,7 @@ typedef struct SortGroupBy
} SortGroupBy;
/*
* JoinUsing - for join using clause
* JoinUsing - for JOIN USING clause
*/
typedef struct JoinUsing
{
@@ -818,7 +840,7 @@ typedef struct JoinUsing
} JoinUsing;
/*
* RangeVar - range variable, used in from clauses
* RangeVar - range variable, used in FROM clauses
*/
typedef struct RangeVar
{
@@ -828,7 +850,7 @@ typedef struct RangeVar
} RangeVar;
/*
* IndexElem - index parameters (used in create index)
* IndexElem - index parameters (used in CREATE INDEX)
*/
typedef struct IndexElem
{