diff options
Diffstat (limited to 'src/include/nodes/plannodes.h')
| -rw-r--r-- | src/include/nodes/plannodes.h | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/src/include/nodes/plannodes.h b/src/include/nodes/plannodes.h index 177ab73a13b..eecb74caf2f 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 1.45 2000/10/26 21:38:12 tgl Exp $ + * $Id: plannodes.h,v 1.46 2000/11/12 00:37:01 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -134,8 +134,10 @@ typedef struct Plan /* ---------------- - * result node - - * returns tuples from outer plan that satisfy the qualifications + * Result node - + * If no outer plan, evaluate a variable-free targetlist. + * If outer plan, return tuples from outer plan that satisfy + * given quals (we can also do a level of projection) * ---------------- */ typedef struct Result @@ -146,21 +148,21 @@ typedef struct Result } Result; /* ---------------- - * append node + * Append node - + * Generate the concatenation of the results of sub-plans. * - * Append nodes can modify the query's rtable during execution. - * If inheritrelid > 0, then the RTE with index inheritrelid is replaced - * by the i'th element of inheritrtable to execute the i'th subplan. - * We assume that this RTE is not used in any other part of the - * query plan tree, else confusion may result... + * Append nodes are sometimes used to switch between several result relations + * (when the target of an UPDATE or DELETE is an inheritance set). Such a + * node will have isTarget true. The Append executor is then responsible + * for updating the executor state to point at the correct target relation + * whenever it switches subplans. * ---------------- */ typedef struct Append { Plan plan; List *appendplans; - Index inheritrelid; - List *inheritrtable; + bool isTarget; AppendState *appendstate; } Append; |