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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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21
src/backend/access/spgist/spgutils.c
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@ -125,6 +125,22 @@ spgGetCache(Relation index)
/* Get the information we need about each relevant datatype */
fillTypeDesc(&cache->attType, atttype);
if (OidIsValid(cache->config.leafType) &&
cache->config.leafType != atttype)
{
if (!OidIsValid(index_getprocid(index, 1, SPGIST_COMPRESS_PROC)))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("compress method must not defined when leaf type is different from input type")));
fillTypeDesc(&cache->attLeafType, cache->config.leafType);
}
else
{
cache->attLeafType = cache->attType;
}
fillTypeDesc(&cache->attPrefixType, cache->config.prefixType);
fillTypeDesc(&cache->attLabelType, cache->config.labelType);
@ -164,6 +180,7 @@ initSpGistState(SpGistState *state, Relation index)
state->config = cache->config;
state->attType = cache->attType;
state->attLeafType = cache->attLeafType;
state->attPrefixType = cache->attPrefixType;
state->attLabelType = cache->attLabelType;
@ -618,7 +635,7 @@ spgFormLeafTuple(SpGistState *state, ItemPointer heapPtr,
/* compute space needed (note result is already maxaligned) */
size = SGLTHDRSZ;
if (!isnull)
size += SpGistGetTypeSize(&state->attType, datum);
size += SpGistGetTypeSize(&state->attLeafType, datum);
/*
* Ensure that we can replace the tuple with a dead tuple later. This
@ -634,7 +651,7 @@ spgFormLeafTuple(SpGistState *state, ItemPointer heapPtr,
tup->nextOffset = InvalidOffsetNumber;
tup->heapPtr = *heapPtr;
if (!isnull)
memcpyDatum(SGLTDATAPTR(tup), &state->attType, datum);
memcpyDatum(SGLTDATAPTR(tup), &state->attLeafType, datum);
return tup;
}