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Teach SP-GiST to do index-only scans.

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Operator classes can specify whether or not they support this; this
preserves the flexibility to use lossy representations within an index.

In passing, move constant data about a given index into the rd_amcache
cache area, instead of doing fresh lookups each time we start an index
operation.  This is mainly to try to make sure that spgcanreturn() has
insignificant cost; I still don't have any proof that it matters for
actual index accesses.  Also, get rid of useless copying of FmgrInfo
pointers; we can perfectly well use the relcache's versions in-place.
This commit is contained in:
Tom Lane
2011-12-19 14:58:41 -05:00
parent 3695a55513
commit 9220362493
10 changed files with 286 additions and 172 deletions
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4
src/include/access/spgist.h
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@ -43,6 +43,7 @@ typedef struct spgConfigOut
{
Oid prefixType; /* Data type of inner-tuple prefixes */
Oid labelType; /* Data type of inner-tuple node labels */
bool canReturnData; /* Opclass can reconstruct original data */
bool longValuesOK; /* Opclass can cope with values > 1 page */
} spgConfigOut;
@ -132,6 +133,7 @@ typedef struct spgInnerConsistentIn
Datum reconstructedValue; /* value reconstructed at parent */
int level; /* current level (counting from zero) */
bool returnData; /* original data must be returned? */
/* Data from current inner tuple */
bool allTheSame; /* tuple is marked all-the-same? */
@ -159,12 +161,14 @@ typedef struct spgLeafConsistentIn
Datum reconstructedValue; /* value reconstructed at parent */
int level; /* current level (counting from zero) */
bool returnData; /* original data must be returned? */
Datum leafDatum; /* datum in leaf tuple */
} spgLeafConsistentIn;
typedef struct spgLeafConsistentOut
{
Datum leafValue; /* reconstructed original data, if any */
bool recheck; /* set true if operator must be rechecked */
} spgLeafConsistentOut;