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Add amnblocks index AM method #78

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Add amnblocks index AM method #78

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12 changes: 12 additions & 0 deletions src/backend/storage/buffer/bufmgr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@
#include <sys/file.h>
#include <unistd.h>

#include "access/amapi.h"
#include "access/tableam.h"
#include "access/xloginsert.h"
#include "access/xlogutils.h"
Expand Down Expand Up @@ -4021,6 +4022,17 @@ RelationGetNumberOfBlocksInFork(Relation relation, ForkNumber forkNum)
}
else if (RELKIND_HAS_STORAGE(relation->rd_rel->relkind))
{
if (relation->rd_rel->relkind == RELKIND_INDEX &&
relation->rd_indam != NULL &&
relation->rd_indam->amnblocks != NULL)
{
BlockNumber nblocks;

nblocks = relation->rd_indam->amnblocks(relation, forkNum);
if (BlockNumberIsValid(nblocks))
return nblocks;
}

return smgrnblocks(RelationGetSmgr(relation), forkNum);
}
else
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7 changes: 7 additions & 0 deletions src/include/access/amapi.h
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Expand Up @@ -241,6 +241,10 @@ typedef void (*aminitparallelscan_function) (void *target);
/* (re)start parallel index scan */
typedef void (*amparallelrescan_function) (IndexScanDesc scan);

/* report number of index blocks */
typedef BlockNumber (*amnblocks_function) (Relation indexRelation,
ForkNumber forkNum);

/*
* API struct for an index AM. Note this must be stored in a single palloc'd
* chunk of memory.
Expand Down Expand Up @@ -333,6 +337,9 @@ typedef struct IndexAmRoutine
amestimateparallelscan_function amestimateparallelscan; /* can be NULL */
aminitparallelscan_function aminitparallelscan; /* can be NULL */
amparallelrescan_function amparallelrescan; /* can be NULL */

/* report number of index blocks, can be NULL */
amnblocks_function amnblocks; /* can be NULL */
} IndexAmRoutine;


Expand Down