diff options
Diffstat (limited to 'src/include/nodes/nodes.h')
| -rw-r--r-- | src/include/nodes/nodes.h | 48 |
1 files changed, 43 insertions, 5 deletions
diff --git a/src/include/nodes/nodes.h b/src/include/nodes/nodes.h index d825c8fe395..f3929d8b2c6 100644 --- a/src/include/nodes/nodes.h +++ b/src/include/nodes/nodes.h @@ -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 */ |