Ejemplo n.º 1
0
void
initSpGistState(SpGistState *state, Relation index)
{
    RegProcedure	propOid;

    Assert(index->rd_att->natts == 1);

    propOid = index_getprocid(index, 1, SPGIST_PROP_PROC);

    state->prop = *(SpGistOpClassProp*)DatumGetPointer(OidFunctionCall0Coll(propOid, InvalidOid));

    fillTypeDesc(&state->attType, state->prop.leafType);
    fillTypeDesc(&state->attNodeType, state->prop.nodeType);
    fillTypeDesc(&state->attPrefixType, state->prop.prefixType);

    fmgr_info_copy(&(state->chooseFn),
                   index_getprocinfo(index, 1, SPGIST_CHOOSE_PROC),
                   CurrentMemoryContext);
    fmgr_info_copy(&(state->picksplitFn),
                   index_getprocinfo(index, 1, SPGIST_PICKSPLIT_PROC),
                   CurrentMemoryContext);
    fmgr_info_copy(&(state->leafConsistentFn),
                   index_getprocinfo(index, 1, SPGIST_LEAFCONS_PROC),
                   CurrentMemoryContext);
    fmgr_info_copy(&(state->innerConsistentFn),
                   index_getprocinfo(index, 1, SPGIST_INNERCONS_PROC),
                   CurrentMemoryContext);

    state->nodeTupDesc = CreateTemplateTupleDesc(1, false);
    TupleDescInitEntry(state->nodeTupDesc, (AttrNumber) 1, NULL,
                       state->attNodeType.type, -1, 0);
}
Ejemplo n.º 2
0
/*
 * Fetch local cache of AM-specific info about the index, initializing it
 * if necessary
 */
SpGistCache *
spgGetCache(Relation index)
{
	SpGistCache *cache;

	if (index->rd_amcache == NULL)
	{
		Oid			atttype;
		spgConfigIn in;
		FmgrInfo   *procinfo;
		Buffer		metabuffer;
		SpGistMetaPageData *metadata;

		cache = MemoryContextAllocZero(index->rd_indexcxt,
									   sizeof(SpGistCache));

		/* SPGiST doesn't support multi-column indexes */
		Assert(index->rd_att->natts == 1);

		/*
		 * Get the actual data type of the indexed column from the index
		 * tupdesc.  We pass this to the opclass config function so that
		 * polymorphic opclasses are possible.
		 */
		atttype = index->rd_att->attrs[0]->atttypid;

		/* Call the config function to get config info for the opclass */
		in.attType = atttype;

		procinfo = index_getprocinfo(index, 1, SPGIST_CONFIG_PROC);
		FunctionCall2Coll(procinfo,
						  index->rd_indcollation[0],
						  PointerGetDatum(&in),
						  PointerGetDatum(&cache->config));

		/* Get the information we need about each relevant datatype */
		fillTypeDesc(&cache->attType, atttype);
		fillTypeDesc(&cache->attPrefixType, cache->config.prefixType);
		fillTypeDesc(&cache->attLabelType, cache->config.labelType);

		/* Last, get the lastUsedPages data from the metapage */
		metabuffer = ReadBuffer(index, SPGIST_METAPAGE_BLKNO);
		LockBuffer(metabuffer, BUFFER_LOCK_SHARE);

		metadata = SpGistPageGetMeta(BufferGetPage(metabuffer));

		if (metadata->magicNumber != SPGIST_MAGIC_NUMBER)
			elog(ERROR, "index \"%s\" is not an SP-GiST index",
				 RelationGetRelationName(index));

		cache->lastUsedPages = metadata->lastUsedPages;

		UnlockReleaseBuffer(metabuffer);

		index->rd_amcache = (void *) cache;
	}
	else
	{
		/* assume it's up to date */
		cache = (SpGistCache *) index->rd_amcache;
	}

	return cache;
}