From 05d13cad2896a58d56c1372d614fde93c7c12d5a Mon Sep 17 00:00:00 2001
From: Hiroshi Inoue <inoue@tpf.co.jp>
Date: Mon, 11 Oct 1999 06:28:29 +0000
Subject: [PATCH] The 1st step to implement new type of scan,TidScan. Now WHERE
restriction on ctid is allowed though it is sequentially scanned.
---
src/backend/access/heap/heapam.c | 91 ++++++++++++++++++++-
src/backend/utils/adt/tid.c | 130 +++++++++++++++++++++++++++++-
src/include/access/heapam.h | 3 +-
src/include/catalog/pg_operator.h | 5 +-
src/include/catalog/pg_proc.h | 9 ++-
src/include/utils/builtins.h | 10 ++-
6 files changed, 238 insertions(+), 10 deletions(-)
diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 4c054921949..89956260cee 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -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
*
diff --git a/src/backend/utils/adt/tid.c b/src/backend/utils/adt/tid.c
index 9e4b81ec095..93fb33f8a95 100644
--- a/src/backend/utils/adt/tid.c
+++ b/src/backend/utils/adt/tid.c
@@ -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() */
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h
index b6dccc33fa8..b672b58053e 100644
--- a/src/include/access/heapam.h
+++ b/src/include/access/heapam.h
@@ -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,
diff --git a/src/include/catalog/pg_operator.h b/src/include/catalog/pg_operator.h
index 5667b870e68..c23f67a4c66 100644
--- a/src/include/catalog/pg_operator.h
+++ b/src/include/catalog/pg_operator.h
@@ -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 ));
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index 24e74f0e624..89ff91c8e84 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -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 - ));
diff --git a/src/include/utils/builtins.h b/src/include/utils/builtins.h
index da09be65243..fe6fd117187 100644
--- a/src/include/utils/builtins.h
+++ b/src/include/utils/builtins.h
@@ -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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