diff options
Diffstat (limited to 'src/include/nodes/execnodes.h')
| -rw-r--r-- | src/include/nodes/execnodes.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index f955815926d..c9781b7255f 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: execnodes.h,v 1.78 2002/11/15 02:50:10 momjian Exp $ + * $Id: execnodes.h,v 1.79 2002/11/22 22:10:01 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -775,17 +775,28 @@ typedef struct SetOpState * 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. + * When lstate == LIMIT_INITIAL, offset/count/noCount haven't been set yet. * ---------------- */ +typedef enum +{ + LIMIT_INITIAL, /* initial state for LIMIT node */ + LIMIT_EMPTY, /* there are no returnable rows */ + LIMIT_INWINDOW, /* have returned a row in the window */ + LIMIT_SUBPLANEOF, /* at EOF of subplan (within window) */ + LIMIT_WINDOWEND, /* stepped off end of window */ + LIMIT_WINDOWSTART /* stepped off beginning of window */ +} LimitStateCond; + 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 */ + LimitStateCond lstate; /* state machine status, as above */ + long position; /* 1-based index of last tuple returned */ + TupleTableSlot *subSlot; /* tuple last obtained from subplan */ } LimitState; |