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The 1st step to implement new type of scan,TidScan.

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Now WHERE restriction on ctid is allowed though it is
sequentially scanned.
REL7_0_PATCHES
Hiroshi Inoue 27 years ago
parent 65a2c8f5b8
commit 05d13cad28
6 changed files with 238 additions and 10 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 91
      src/backend/access/heap/heapam.c
  2. 130
      src/backend/utils/adt/tid.c
  3. 3
      src/include/access/heapam.h
  4. 5
      src/include/catalog/pg_operator.h
  5. 9
      src/include/catalog/pg_proc.h
  6. 10
      src/include/utils/builtins.h

91
src/backend/access/heap/heapam.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.55 1999/09/24 00:23:54 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/access/heap/heapam.c,v 1.56 1999/10/11 06:28:27 inoue Exp $
*
*
* INTERFACE ROUTINES
@ -1086,6 +1086,95 @@ heap_fetch(Relation relation,
}
}
/* ----------------
* heap_get_latest_tid - get the latest tid of a specified tuple
*
* ----------------
*/
ItemPointer
heap_get_latest_tid(Relation relation,
Snapshot snapshot,
ItemPointer tid)
{
ItemId lp;
Buffer buffer;
PageHeader dp;
OffsetNumber offnum;
HeapTupleData tp;
HeapTupleHeader t_data;
ItemPointerData ctid;
bool invalidBlock,linkend;
/* ----------------
* get the buffer from the relation descriptor
* Note that this does a buffer pin.
* ----------------
*/
buffer = ReadBuffer(relation, ItemPointerGetBlockNumber(tid));
if (!BufferIsValid(buffer))
elog(ERROR, "heap_get_latest_tid: %s relation: ReadBuffer(%lx) failed",
&relation->rd_rel->relname, (long) tid);
LockBuffer(buffer, BUFFER_LOCK_SHARE);
/* ----------------
* get the item line pointer corresponding to the requested tid
* ----------------
*/
dp = (PageHeader) BufferGetPage(buffer);
offnum = ItemPointerGetOffsetNumber(tid);
invalidBlock = true;
if (!PageIsNew(dp))
{
lp = PageGetItemId(dp, offnum);
if (ItemIdIsUsed(lp))
invalidBlock = false;
}
if (invalidBlock)
{
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
return NULL;
}
/* ----------------
* more sanity checks
* ----------------
*/
t_data = tp.t_data = (HeapTupleHeader) PageGetItem((Page) dp, lp);
tp.t_len = ItemIdGetLength(lp);
tp.t_self = *tid;
ctid = tp.t_data->t_ctid;
/* ----------------
* check time qualification of tid
* ----------------
*/
HeapTupleSatisfies(&tp, relation, buffer, dp,
snapshot, 0, (ScanKey) NULL);
linkend = true;
if ((t_data->t_infomask & HEAP_XMAX_COMMITTED) &&
!ItemPointerEquals(tid, &ctid))
linkend = false;
LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
ReleaseBuffer(buffer);
if (tp.t_data == NULL)
{
if (linkend)
return NULL;
return heap_get_latest_tid(relation, snapshot, &ctid);
}
return tid;
}
/* ----------------
* heap_insert - insert tuple
*

130
src/backend/utils/adt/tid.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/tid.c,v 1.11 1999/07/17 20:18:00 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/tid.c,v 1.12 1999/10/11 06:28:26 inoue Exp $
*
* NOTES
* input routine largely stolen from boxin().
@ -28,9 +28,9 @@
* ----------------------------------------------------------------
*/
ItemPointer
tidin(char *str)
tidin(const char *str)
{
char *p,
const char *p,
*coord[NTIDARGS];
int i;
ItemPointer result;
@ -45,8 +45,12 @@ tidin(char *str)
if (*p == DELIM || (*p == LDELIM && !i))
coord[i++] = p + 1;
if (i < NTIDARGS - 1)
/* if (i < NTIDARGS - 1) */
if (i < NTIDARGS)
{
elog(ERROR, "%s invalid tid format", str);
return NULL;
}
blockNumber = (BlockNumber) atoi(coord[0]);
offsetNumber = (OffsetNumber) atoi(coord[1]);
@ -70,6 +74,14 @@ tidout(ItemPointer itemPtr)
BlockId blockId;
char buf[32];
char *str;
static char *invalidTid = "()";
if (!itemPtr || !ItemPointerIsValid(itemPtr))
{
str = palloc(strlen(invalidTid));
strcpy(str, invalidTid);
return str;
}
blockId = &(itemPtr->ip_blkid);
@ -83,3 +95,113 @@ tidout(ItemPointer itemPtr)
return str;
}
/*****************************************************************************
* PUBLIC ROUTINES *
*****************************************************************************/
bool
tideq(ItemPointer arg1, ItemPointer arg2)
{
if ((!arg1) || (!arg2))
{
return false;
}
return ( BlockIdGetBlockNumber(&(arg1->ip_blkid)) ==
BlockIdGetBlockNumber(&(arg2->ip_blkid)) &&
arg1->ip_posid == arg2->ip_posid );
}
bool
tidne(ItemPointer arg1, ItemPointer arg2)
{
if ((!arg1) || (!arg2))
{
return false;
}
return ( BlockIdGetBlockNumber(&(arg1->ip_blkid)) !=
BlockIdGetBlockNumber(&(arg2->ip_blkid)) ||
arg1->ip_posid != arg2->ip_posid );
}
text *
tid_text(ItemPointer tid)
{
char *str;
if (!tid) return (text *)NULL;
str = tidout(tid);
return textin(str);
} /* tid_text() */
ItemPointer
text_tid(const text *string)
{
ItemPointer result;
char *str;
if (!string) return (ItemPointer)0;
str = textout(string);
result = tidin(str);
pfree(str);
return result;
} /* text_tid() */
/*
* Functions to get latest tid of a specified tuple.
* Maybe these implementations is moved
* to another place
*/
#include <utils/relcache.h>
ItemPointer
currtid_byreloid(Oid reloid, ItemPointer tid)
{
ItemPointer result = NULL, ret;
Relation rel;
result = (ItemPointer) palloc(sizeof(ItemPointerData));
ItemPointerSetInvalid(result);
if (rel = heap_open(reloid, AccessShareLock), rel)
{
ret = heap_get_latest_tid(rel, SnapshotNow, tid);
if (ret)
ItemPointerCopy(ret, result);
heap_close(rel, AccessShareLock);
}
else
elog(ERROR, "Relation %u not found", reloid);
return result;
} /* currtid_byreloid() */
ItemPointer
currtid_byrelname(const text *relname, ItemPointer tid)
{
ItemPointer result = NULL, ret;
char *str;
Relation rel;
if (!relname) return result;
str = textout(relname);
result = (ItemPointer) palloc(sizeof(ItemPointerData));
ItemPointerSetInvalid(result);
if (rel = heap_openr(str, AccessShareLock), rel)
{
ret = heap_get_latest_tid(rel, SnapshotNow, tid);
if (ret)
ItemPointerCopy(ret, result);
heap_close(rel, AccessShareLock);
}
else
elog(ERROR, "Relation %s not found", relname);
pfree(str);
return result;
} /* currtid_byrelname() */

3
src/include/access/heapam.h
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@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: heapam.h,v 1.46 1999/09/18 19:08:13 tgl Exp $
* $Id: heapam.h,v 1.47 1999/10/11 06:28:29 inoue Exp $
*
*-------------------------------------------------------------------------
*/
@ -256,6 +256,7 @@ extern void heap_rescan(HeapScanDesc scan, bool scanFromEnd, ScanKey key);
extern void heap_endscan(HeapScanDesc scan);
extern HeapTuple heap_getnext(HeapScanDesc scandesc, int backw);
extern void heap_fetch(Relation relation, Snapshot snapshot, HeapTuple tup, Buffer *userbuf);
extern ItemPointer heap_get_latest_tid(Relation relation, Snapshot snapshot, ItemPointer tid);
extern Oid heap_insert(Relation relation, HeapTuple tup);
extern int heap_delete(Relation relation, ItemPointer tid, ItemPointer ctid);
extern int heap_replace(Relation relation, ItemPointer otid, HeapTuple tup,

5
src/include/catalog/pg_operator.h
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@ -7,7 +7,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: pg_operator.h,v 1.59 1999/09/06 21:16:18 tgl Exp $
* $Id: pg_operator.h,v 1.60 1999/10/11 06:28:29 inoue Exp $
*
* NOTES
* the genbki.sh script reads this file and generates .bki
@ -136,6 +136,9 @@ DATA(insert OID = 399 ( "=" PGUID 0 b t f 1026 1026 16 399 0 0 0 array_e
DATA(insert OID = 400 ( "=" PGUID 0 b t f 1027 1027 16 400 0 0 0 array_eq eqsel eqjoinsel ));
DATA(insert OID = 401 ( "=" PGUID 0 b t f 1034 1034 16 401 0 0 0 array_eq eqsel eqjoinsel ));
DATA(insert OID = 387 ( "=" PGUID 0 b t t 27 27 16 387 0 0 0 tideq eqsel eqjoinsel ));
#define TIDEqualOperator 387
DATA(insert OID = 410 ( "=" PGUID 0 b t t 20 20 16 410 411 412 412 int8eq eqsel eqjoinsel ));
DATA(insert OID = 411 ( "<>" PGUID 0 b t f 20 20 16 411 410 0 0 int8ne neqsel neqjoinsel ));
DATA(insert OID = 412 ( "<" PGUID 0 b t f 20 20 16 413 415 0 0 int8lt intltsel intltjoinsel ));

9
src/include/catalog/pg_proc.h
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@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: pg_proc.h,v 1.104 1999/09/30 14:54:23 wieck Exp $
* $Id: pg_proc.h,v 1.105 1999/10/11 06:28:28 inoue Exp $
*
* NOTES
* The script catalog/genbki.sh reads this file and generates .bki
@ -1560,6 +1560,13 @@ DESCR("truncate _char()");
DATA(insert OID = 1291 ( _varchar PGUID 11 f t t 2 f 1015 "1015 23" 100 0 0 100 _varchar - ));
DESCR("truncate _varchar()");
DATA(insert OID = 1292 ( tideq PGUID 11 f t f 2 f 16 "27 27" 100 0 0 100 tideq - ));
DESCR("equal");
DATA(insert OID = 1293 ( currtid PGUID 11 f t f 2 f 27 "26 27" 100 0 0 100 currtid_byreloid - ));
DESCR("latest tid of a tuple");
DATA(insert OID = 1294 ( currtid2 PGUID 11 f t f 2 f 27 "25 27" 100 0 0 100 currtid_byrelname - ));
DESCR("latest tid of a tuple");
DATA(insert OID = 1297 ( timestamp_in PGUID 11 f t f 1 f 1296 "0" 100 0 0 100 timestamp_in - ));
DESCR("(internal)");
DATA(insert OID = 1298 ( timestamp_out PGUID 11 f t f 1 f 23 "0" 100 0 0 100 timestamp_out - ));

10
src/include/utils/builtins.h
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@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: builtins.h,v 1.88 1999/10/03 23:55:37 tgl Exp $
* $Id: builtins.h,v 1.89 1999/10/11 06:28:28 inoue Exp $
*
* NOTES
* This should normally only be included by fmgr.h.
@ -399,8 +399,14 @@ extern float64 gistsel(Oid operatorObjectId, Oid indrelid, AttrNumber attributeN
extern float64 gistnpage(Oid operatorObjectId, Oid indrelid, AttrNumber attributeNumber, char *constValue, int32 constFlag, int32 nIndexKeys, Oid indexrelid);
/* tid.c */
extern ItemPointer tidin(char *str);
extern ItemPointer tidin(const char *str);
extern char *tidout(ItemPointer itemPtr);
extern bool tideq(ItemPointer,ItemPointer);
extern bool tidne(ItemPointer,ItemPointer);
extern text *tid_text(ItemPointer);
extern ItemPointer text_tid(const text *);
extern ItemPointer currtid_byreloid(Oid relOid, ItemPointer);
extern ItemPointer currtid_byrelname(const text* relName, ItemPointer);
/* timestamp.c */
extern time_t timestamp_in(const char *timestamp_str);

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