gidx_merge()

void gidx_merge	(	GIDX **	b_union,
		GIDX *	b_new
	)

Definition at line 173 of file gserialized_gist_nd.c.

{
        int i, dims_union, dims_new;
        Assert(b_union);
        Assert(*b_union);
        Assert(b_new);
 
        /* Can't merge an unknown into any thing */
        if( gidx_is_unknown(b_new) )
                return;
 
        /* Merge of unknown and known is known */
        if( gidx_is_unknown(*b_union) )
        {
                pfree(*b_union);
                *b_union = gidx_copy(b_new);
                return;
        }
 
        dims_union = GIDX_NDIMS(*b_union);
        dims_new = GIDX_NDIMS(b_new);
 
        POSTGIS_DEBUGF(4, "merging gidx (%s) into gidx (%s)", gidx_to_string(b_new), gidx_to_string(*b_union));
 
        if ( dims_new < dims_union )
        {
                POSTGIS_DEBUGF(5, "reallocating b_union from %d dims to %d dims", dims_union, dims_new);
                *b_union = (GIDX*)repalloc(*b_union, GIDX_SIZE(dims_new));
                SET_VARSIZE(*b_union, VARSIZE(b_new));
                dims_union = dims_new;
        }
 
        for ( i = 0; i < dims_union; i++ )
        {
                /* Adjust minimums */
                GIDX_SET_MIN(*b_union, i, Min(GIDX_GET_MIN(*b_union,i),GIDX_GET_MIN(b_new,i)));
                /* Adjust maximums */
                GIDX_SET_MAX(*b_union, i, Max(GIDX_GET_MAX(*b_union,i),GIDX_GET_MAX(b_new,i)));
        }
 
        POSTGIS_DEBUGF(5, "merge complete (%s)", gidx_to_string(*b_union));
        return;
}

References gidx_copy(), and gidx_is_unknown().

Referenced by gserialized_gist_picksplit(), gserialized_gist_picksplit_addlist(), gserialized_gist_picksplit_constructsplit(), gserialized_gist_picksplit_fallback(), gserialized_gist_union(), and spatial_index_read_extent().

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