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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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48
src/include/nodes/nodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nodes.h,v 1.75 2000/08/24 03:29:13 tgl Exp $
* $Id: nodes.h,v 1.76 2000/09/12 21:07:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -68,6 +68,8 @@ typedef enum NodeTag
T_ArrayRef,
T_Iter,
T_RelabelType,
T_RangeTblRef,
T_JoinExpr,
/*---------------------
* TAGS FOR PLANNER NODES (relation.h)
@ -204,7 +206,7 @@ typedef enum NodeTag
T_A_Indices,
T_ResTarget,
T_TypeCast,
T_RelExpr,
T_RangeSubselect,
T_SortGroupBy,
T_RangeVar,
T_TypeName,
@ -217,14 +219,14 @@ typedef enum NodeTag
T_SortClause,
T_GroupClause,
T_SubSelectXXX, /* not used anymore; this tag# is available */
T_JoinExpr,
T_oldJoinExprXXX, /* not used anymore; this tag# is available */
T_CaseExpr,
T_CaseWhen,
T_RowMark,
T_FkConstraint,
/*---------------------
* TAGS FOR FUNCTION-CALL CONTEXT AND RESULTINFO NODES (cf. fmgr.h)
* TAGS FOR FUNCTION-CALL CONTEXT AND RESULTINFO NODES (see fmgr.h)
*---------------------
*/
T_TriggerData = 800, /* in commands/trigger.h */
@ -310,7 +312,7 @@ typedef double Cost; /* execution cost (in page-access units) */
/*
* CmdType -
* enums for type of operation to aid debugging
* enums for type of operation represented by a Query
*
* ??? could have put this in parsenodes.h but many files not in the
* optimizer also need this...
@ -329,4 +331,40 @@ typedef enum CmdType
} CmdType;
/*
* JoinType -
* enums for types of relation joins
*
* JoinType determines the exact semantics of joining two relations using
* a matching qualification. For example, it tells what to do with a tuple
* that has no match in the other relation.
*
* This is needed in both parsenodes.h and plannodes.h, so put it here...
*/
typedef enum JoinType
{
/*
* The canonical kinds of joins
*/
JOIN_INNER, /* matching tuple pairs only */
JOIN_LEFT, /* pairs + unmatched outer tuples */
JOIN_FULL, /* pairs + unmatched outer + unmatched inner */
JOIN_RIGHT, /* pairs + unmatched inner tuples */
/*
* SQL92 considers UNION JOIN to be a kind of join, so list it here for
* parser convenience, even though it's not implemented like a join in
* the executor. (The planner must convert it to an Append plan.)
*/
JOIN_UNION
/*
* Eventually we will have some additional join types for efficient
* support of queries like WHERE foo IN (SELECT bar FROM ...).
*/
} JoinType;
#define IS_OUTER_JOIN(jointype) \
((jointype) == JOIN_LEFT || \
(jointype) == JOIN_FULL || \
(jointype) == JOIN_RIGHT)
#endif /* NODES_H */