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Add optional compression method to SP-GiST

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Patch allows to have different types of column and value stored in leaf tuples
of SP-GiST. The main application of feature is to transform complex column type
to simple indexed type or for truncating too long value, transformation could
be lossy.  Simple example: polygons are converted to their bounding boxes,
this opclass follows.

Authors: me, Heikki Linnakangas, Alexander Korotkov, Nikita Glukhov
Reviewed-By: all authors + Darafei Praliaskouski
Discussions:
https://www.postgresql.org/message-id/5447B3FF.2080406@sigaev.ru
https://www.postgresql.org/message-id/flat/54907069.1030506@sigaev.ru#54907069.1030506@sigaev.ru
This commit is contained in:
Teodor Sigaev
2017-12-22 13:33:16 +03:00
parent 9373baa0f7
commit 854823fa33
7 changed files with 182 additions and 37 deletions
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5
src/include/access/spgist.h
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@@ -30,7 +30,9 @@
#define SPGIST_PICKSPLIT_PROC 3
#define SPGIST_INNER_CONSISTENT_PROC 4
#define SPGIST_LEAF_CONSISTENT_PROC 5
#define SPGISTNProc 5
#define SPGIST_COMPRESS_PROC 6
#define SPGISTNRequiredProc 5
#define SPGISTNProc 6
/*
* Argument structs for spg_config method
@@ -44,6 +46,7 @@ typedef struct spgConfigOut
{
Oid prefixType; /* Data type of inner-tuple prefixes */
Oid labelType; /* Data type of inner-tuple node labels */
Oid leafType; /* Data type of leaf-tuple values */
bool canReturnData; /* Opclass can reconstruct original data */
bool longValuesOK; /* Opclass can cope with values > 1 page */
} spgConfigOut;