1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
/*-------------------------------------------------------------------------
*
* tuptable.h--
* tuple table support stuff
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: tuptable.h,v 1.3 1996/11/03 12:12:42 scrappy Exp $
*
* NOTES
* The tuple table interface is getting pretty ugly.
* It should be redesigned soon.
*
*-------------------------------------------------------------------------
*/
#ifndef TUPTABLE_H
#define TUPTABLE_H
#include "access/htup.h"
#include "storage/buf.h"
/* ----------------
* Note: the executor tuple table is managed and manipulated by special
* code and macros in executor/execTuples.c and tupTable.h
*
* TupleTableSlot information
*
* shouldFree boolean - should we call pfree() on tuple
* descIsNew boolean - true when tupleDescriptor changes
* tupleDescriptor type information kept regarding the tuple data
* buffer the buffer for tuples pointing to disk pages
*
* The executor stores pointers to tuples in a ``tuple table''
* which is composed of TupleTableSlot's. Some of the tuples
* are pointers to buffer pages and others are pointers to
* palloc'ed memory and the shouldFree variable tells us when
* we may call pfree() on a tuple. -cim 9/23/90
*
* In the implementation of nested-dot queries such as
* "retrieve (EMP.hobbies.all)", a single scan may return tuples
* of many types, so now we return pointers to tuple descriptors
* along with tuples returned via the tuple table. -cim 1/18/90
* ----------------
*/
typedef struct TupleTableSlot {
NodeTag type;
HeapTuple val;
bool ttc_shouldFree;
bool ttc_descIsNew;
TupleDesc ttc_tupleDescriptor;
Buffer ttc_buffer;
int ttc_whichplan;
} TupleTableSlot;
/* ----------------
* tuple table data structure
* ----------------
*/
typedef struct TupleTableData {
int size; /* size of the table */
int next; /* next available slot number */
TupleTableSlot *array; /* array of TupleTableSlot's */
} TupleTableData;
typedef TupleTableData *TupleTable;
/*
tuple table macros are all excised from the system now
see executor.h for decls of functions defined in execTuples.c
- jolly
*/
#endif /* TUPTABLE_H */