diff options
Diffstat (limited to 'src/include/nodes/plannodes.h')
| -rw-r--r-- | src/include/nodes/plannodes.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h index cf93b9dee17..ca5727f0152 100644 --- a/src/include/nodes/plannodes.h +++ b/src/include/nodes/plannodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: plannodes.h,v 1.42 2000/09/12 21:07:10 tgl Exp $ + * $Id: plannodes.h,v 1.43 2000/09/29 18:21:39 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -31,6 +31,7 @@ * * Scan *** CommonScanState scanstate; * IndexScan IndexScanState indxstate; + * SubqueryScan SubqueryScanState subquerystate; * * (*** nodes which inherit Scan also inherit scanstate) * @@ -202,6 +203,26 @@ typedef struct TidScan TidScanState *tidstate; } TidScan; +/* ---------------- + * subquery scan node + * + * SubqueryScan is for scanning the output of a sub-query in the range table. + * We need a special plan node above the sub-query's plan as a place to switch + * execution contexts. Although we are not scanning a physical relation, + * we make this a descendant of Scan anyway for code-sharing purposes. + * + * Note: we store the sub-plan in the type-specific subplan field, not in + * the generic lefttree field as you might expect. This is because we do + * not want plan-tree-traversal routines to recurse into the subplan without + * knowing that they are changing Query contexts. + * ---------------- + */ +typedef struct SubqueryScan +{ + Scan scan; + Plan *subplan; +} SubqueryScan; + /* * ========== * Join nodes |