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Commitc5bf7a2

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WAL-log the extension of a new empty MV heap which is being populated.
This page with no tuples is used to distinguish an MV containing azero-row resultset of its backing query from an MV which has notbeen populated by its backing query. Unless WAL-logged, recoveryand hot standby don't work correctly with what should be an emptybut scannable materialized view.Fixes bugs reported by Fujii Masao in testing MVs on hot standby.
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‎src/backend/commands/matview.c

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -14,6 +14,7 @@
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*/
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#include"postgres.h"
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17+
#include"access/heapam_xlog.h"
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#include"access/multixact.h"
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#include"access/relscan.h"
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#include"access/xact.h"
@@ -68,10 +69,15 @@ SetRelationIsScannable(Relation relation)
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Assert(relation->rd_rel->relkind==RELKIND_MATVIEW);
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Assert(relation->rd_isscannable== false);
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71-
RelationOpenSmgr(relation);
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page= (Page)palloc(BLCKSZ);
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PageInit(page,BLCKSZ,0);
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if (RelationNeedsWAL(relation))
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log_newpage(&(relation->rd_node),MAIN_FORKNUM,0,page);
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RelationOpenSmgr(relation);
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smgrextend(relation->rd_smgr,MAIN_FORKNUM,0, (char*)page, true);
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pfree(page);
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smgrimmedsync(relation->rd_smgr,MAIN_FORKNUM);

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