gidx_merge()

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

Definition at line 160 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 */
        /* Q: Unknown is 0 dimensions. Should we reset result to unknown instead? (ticket #4232) */
        if (gidx_is_unknown(b_new))
                return;
 
        /* Merge of unknown and known is known */
        /* Q: Unknown is 0 dimensions. Should we never modify unknown instead? (ticket #4232) */
        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);
 
        /* Shrink unshared dimensions.
         * Unset dimension is essentially [-FLT_MAX, FLT_MAX], so we can either trim it or reset to that range.*/
        if (dims_new < dims_union)
        {
                *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)));
        }
}

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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