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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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37
src/backend/access/spgist/spgdoinsert.c
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@ -1906,14 +1906,37 @@ spgdoinsert(Relation index, SpGistState *state,
procinfo = index_getprocinfo(index, 1, SPGIST_CHOOSE_PROC);
/*
* Since we don't use index_form_tuple in this AM, we have to make sure
* Prepare the leaf datum to insert.
*
* If an optional "compress" method is provided, then call it to form
* the leaf datum from the input datum. Otherwise store the input datum as
* is. Since we don't use index_form_tuple in this AM, we have to make sure
* value to be inserted is not toasted; FormIndexDatum doesn't guarantee
* that.
* that. But we assume the "compress" method to return an untoasted value.
*/
if (!isnull && state->attType.attlen == -1)
datum = PointerGetDatum(PG_DETOAST_DATUM(datum));
if (!isnull)
{
if (OidIsValid(index_getprocid(index, 1, SPGIST_COMPRESS_PROC)))
{
FmgrInfo *compressProcinfo = NULL;
leafDatum = datum;
compressProcinfo = index_getprocinfo(index, 1, SPGIST_COMPRESS_PROC);
leafDatum = FunctionCall1Coll(compressProcinfo,
index->rd_indcollation[0],
datum);
}
else
{
Assert(state->attLeafType.type == state->attType.type);
if (state->attType.attlen == -1)
leafDatum = PointerGetDatum(PG_DETOAST_DATUM(datum));
else
leafDatum = datum;
}
}
else
leafDatum = (Datum) 0;
/*
* Compute space needed for a leaf tuple containing the given datum.
@ -1923,7 +1946,7 @@ spgdoinsert(Relation index, SpGistState *state,
*/
if (!isnull)
leafSize = SGLTHDRSZ + sizeof(ItemIdData) +
SpGistGetTypeSize(&state->attType, leafDatum);
SpGistGetTypeSize(&state->attLeafType, leafDatum);
else
leafSize = SGDTSIZE + sizeof(ItemIdData);
@ -2138,7 +2161,7 @@ spgdoinsert(Relation index, SpGistState *state,
{
leafDatum = out.result.matchNode.restDatum;
leafSize = SGLTHDRSZ + sizeof(ItemIdData) +
SpGistGetTypeSize(&state->attType, leafDatum);
SpGistGetTypeSize(&state->attLeafType, leafDatum);
}
/*