diff options
Diffstat (limited to 'src/include/access/heapam.h')
| -rw-r--r-- | src/include/access/heapam.h | 105 |
1 files changed, 95 insertions, 10 deletions
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h index f3c7c55bda6..4e5fe7ca5b7 100644 --- a/src/include/access/heapam.h +++ b/src/include/access/heapam.h @@ -6,13 +6,14 @@ * * Copyright (c) 1994, Regents of the University of California * - * $Id: heapam.h,v 1.26 1998/01/27 15:57:41 momjian Exp $ + * $Id: heapam.h,v 1.27 1998/01/31 04:39:21 momjian Exp $ * *------------------------------------------------------------------------- */ #ifndef HEAPAM_H #define HEAPAM_H +#include <access/tupmacs.h> #include <access/htup.h> #include <access/relscan.h> #include <storage/block.h> @@ -80,6 +81,59 @@ typedef HeapAccessStatisticsData *HeapAccessStatistics; (heap_access_stats == NULL ? 0 : (heap_access_stats->x)++) /* ---------------- + * fastgetattr + * + * This gets called many times, so we macro the cacheable and NULL + * lookups, and call noncachegetattr() for the rest. + * + * ---------------- + */ +#define fastgetattr(tup, attnum, tupleDesc, isnull) \ +( \ + AssertMacro((attnum) > 0) ? \ + ( \ + ((isnull) ? (*(isnull) = false) : (dummyret)NULL), \ + HeapTupleNoNulls(tup) ? \ + ( \ + ((tupleDesc)->attrs[(attnum)-1]->attcacheoff > 0) ? \ + ( \ + (Datum)fetchatt(&((tupleDesc)->attrs[(attnum)-1]), \ + (char *) (tup) + (tup)->t_hoff + (tupleDesc)->attrs[(attnum)-1]->attcacheoff) \ + ) \ + : \ + ( \ + ((attnum)-1 == 0) ? \ + ( \ + (Datum)fetchatt(&((tupleDesc)->attrs[0]), (char *) (tup) + (tup)->t_hoff) \ + ) \ + : \ + ( \ + nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \ + ) \ + ) \ + ) \ + : \ + ( \ + att_isnull((attnum)-1, (tup)->t_bits) ? \ + ( \ + ((isnull) ? (*(isnull) = true) : (dummyret)NULL), \ + (Datum)NULL \ + ) \ + : \ + ( \ + nocachegetattr((tup), (attnum), (tupleDesc), (isnull)) \ + ) \ + ) \ + ) \ + : \ + ( \ + (Datum)NULL \ + ) \ +) + + + +/* ---------------- * heap_getattr * * Find a particular field in a row represented as a heap tuple. @@ -97,15 +151,46 @@ typedef HeapAccessStatisticsData *HeapAccessStatistics; * Because this macro is often called with constants, it generates * compiler warnings about 'left-hand comma expression has no effect. * - * ---------------- */ -#define heap_getattr(tup, b, attnum, tupleDesc, isnull) \ - (AssertMacro((tup) != NULL) ? \ + * ---------------- + */ +#define heap_getattr(tup, attnum, tupleDesc, isnull) \ +( \ + AssertMacro((tup) != NULL && \ + (attnum) > FirstLowInvalidHeapAttributeNumber && \ + (attnum) != 0) ? \ + ( \ ((attnum) > (int) (tup)->t_natts) ? \ - (((isnull) ? (*(isnull) = true) : (dummyret)NULL), (Datum)NULL) : \ - ((attnum) > 0) ? \ - fastgetattr((tup), (attnum), (tupleDesc), (isnull)) : \ - (((isnull) ? (*(isnull) = false) : (dummyret)NULL), heap_getsysattr((tup), (b), (attnum))) : \ - (Datum)NULL) + ( \ + ((isnull) ? (*(isnull) = true) : (dummyret)NULL), \ + (Datum)NULL \ + ) \ + : \ + ( \ + ((attnum) > 0) ? \ + ( \ + fastgetattr((tup), (attnum), (tupleDesc), (isnull)) \ + ) \ + : \ + ( \ + ((isnull) ? (*(isnull) = false) : (dummyret)NULL), \ + ((attnum) == SelfItemPointerAttributeNumber) ? \ + ( \ + (Datum)((char *)(tup) + \ + heap_sysoffset[-SelfItemPointerAttributeNumber-1]) \ + ) \ + : \ + ( \ + (Datum)*(unsigned int *) \ + ((char *)(tup) + heap_sysoffset[-(attnum)-1]) \ + ) \ + ) \ + ) \ + ) \ + : \ + ( \ + (Datum)NULL \ + ) \ +) extern HeapAccessStatistics heap_access_stats; /* in stats.c */ @@ -143,7 +228,7 @@ extern int heap_attisnull(HeapTuple tup, int attnum); extern int heap_sysattrlen(AttrNumber attno); extern bool heap_sysattrbyval(AttrNumber attno); extern Datum heap_getsysattr(HeapTuple tup, Buffer b, int attnum); -extern Datum fastgetattr(HeapTuple tup, int attnum, +extern Datum nocachegetattr(HeapTuple tup, int attnum, TupleDesc att, bool *isnull); extern HeapTuple heap_copytuple(HeapTuple tuple); extern HeapTuple heap_formtuple(TupleDesc tupleDescriptor, |