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Commit772f63d

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Fix nodeTidscan.c to not trigger an error if the block number portion of
a user-supplied TID is out of range for the relation. This is needed topreserve compatibility with our pre-8.3 behavior, and it is sensible anywaysince if the query were implemented by brute force rather than optimizedinto a TidScan, the behavior for a non-existent TID would be zero rows out,never an error. Per gripe from Gurjeet Singh.
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‎src/backend/executor/nodeTidscan.c‎

Lines changed: 15 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
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*
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* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/executor/nodeTidscan.c,v 1.58 2008/01/01 19:45:49 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/executor/nodeTidscan.c,v 1.59 2008/04/30 23:28:32 tgl Exp $
1212
*
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*-------------------------------------------------------------------------
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*/
@@ -54,11 +54,20 @@ TidListCreate(TidScanState *tidstate)
5454
{
5555
List*evalList=tidstate->tss_tidquals;
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ExprContext*econtext=tidstate->ss.ps.ps_ExprContext;
57+
BlockNumbernblocks;
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ItemPointerData*tidList;
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intnumAllocTids;
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intnumTids;
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ListCell*l;
6162

63+
/*
64+
* We silently discard any TIDs that are out of range at the time of
65+
* scan start. (Since we hold at least AccessShareLock on the table,
66+
* it won't be possible for someone to truncate away the blocks we
67+
* intend to visit.)
68+
*/
69+
nblocks=RelationGetNumberOfBlocks(tidstate->ss.ss_currentRelation);
70+
6271
/*
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* We initialize the array with enough slots for the case that all quals
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* are simple OpExprs or CurrentOfExprs. If there are any
@@ -97,7 +106,9 @@ TidListCreate(TidScanState *tidstate)
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econtext,
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&isNull,
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NULL));
100-
if (!isNull&&ItemPointerIsValid(itemptr))
109+
if (!isNull&&
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ItemPointerIsValid(itemptr)&&
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ItemPointerGetBlockNumber(itemptr)<nblocks)
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{
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if (numTids >=numAllocTids)
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{
@@ -142,7 +153,8 @@ TidListCreate(TidScanState *tidstate)
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if (!ipnulls[i])
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{
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itemptr= (ItemPointer)DatumGetPointer(ipdatums[i]);
145-
if (ItemPointerIsValid(itemptr))
156+
if (ItemPointerIsValid(itemptr)&&
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ItemPointerGetBlockNumber(itemptr)<nblocks)
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tidList[numTids++]=*itemptr;
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}
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}

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