diff options
Diffstat (limited to 'src/include/nodes/primnodes.h')
| -rw-r--r-- | src/include/nodes/primnodes.h | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index 185673f729a..7efb6ec77cf 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -10,7 +10,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.126 2007/02/20 17:32:17 tgl Exp $ + * $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.127 2007/02/22 22:00:25 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -428,8 +428,10 @@ typedef struct SubLink * SubPlan - executable expression node for a subplan (sub-SELECT) * * The planner replaces SubLink nodes in expression trees with SubPlan - * nodes after it has finished planning the subquery. SubPlan contains - * a sub-plantree and rtable instead of a sub-Query. + * nodes after it has finished planning the subquery. SubPlan references + * a sub-plantree stored in the subplans list of the toplevel PlannedStmt. + * (We avoid a direct link to make it easier to copy expression trees + * without causing multiple processing of the subplan.) * * In an ordinary subplan, testexpr points to an executable expression * (OpExpr, an AND/OR tree of OpExprs, or RowCompareExpr) for the combining @@ -463,12 +465,10 @@ typedef struct SubPlan /* The combining operators, transformed to an executable expression: */ Node *testexpr; /* OpExpr or RowCompareExpr expression tree */ List *paramIds; /* IDs of Params embedded in the above */ - /* The subselect, transformed to a Plan: */ - struct Plan *plan; /* subselect plan itself */ - int plan_id; /* kluge because we haven't equal-funcs for - * plan nodes... we compare this instead of - * subselect plan */ - List *rtable; /* range table for subselect */ + /* Identification of the Plan tree to use: */ + int plan_id; /* Index (from 1) in PlannedStmt.subplans */ + /* Extra data saved for the convenience of exprType(): */ + Oid firstColType; /* Type of first column of subplan result */ /* Information about execution strategy: */ bool useHashTable; /* TRUE to store subselect output in a hash * table (implies we are doing "IN") */ |