diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index 06de4be54c..14cd94baa0 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: execnodes.h,v 1.51 2000/10/05 19:11:36 tgl Exp $ + * $Id: execnodes.h,v 1.52 2000/10/26 21:38:12 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -675,6 +675,28 @@ typedef struct SetOpState MemoryContext tempContext; /* short-term context for comparisons */ } SetOpState; +/* ---------------- + * LimitState information + * + * Limit nodes are used to enforce LIMIT/OFFSET clauses. + * They just select the desired subrange of their subplan's output. + * + * offset is the number of initial tuples to skip (0 does nothing). + * count is the number of tuples to return after skipping the offset tuples. + * If no limit count was specified, count is undefined and noCount is true. + * ---------------- + */ +typedef struct LimitState +{ + CommonState cstate; /* its first field is NodeTag */ + long offset; /* current OFFSET value */ + long count; /* current COUNT, if any */ + long position; /* 1-based index of last tuple fetched */ + bool parmsSet; /* have we calculated offset/limit yet? */ + bool noCount; /* if true, ignore count */ + bool atEnd; /* if true, we've reached EOF of subplan */ +} LimitState; + /* ---------------- * HashState information |