gserialized_gist_compress_2d()

Datum gserialized_gist_compress_2d

(

PG_FUNCTION_ARGS

)

Definition at line 817 of file gserialized_gist_2d.c.

{
        GISTENTRY *entry_in = (GISTENTRY*)PG_GETARG_POINTER(0);
        GISTENTRY *entry_out = NULL;
        BOX2DF bbox_out;
        int result = LW_SUCCESS;
 
        POSTGIS_DEBUG(4, "[GIST] 'compress' function called");
 
        /*
        ** Not a leaf key? There's nothing to do.
        ** Return the input unchanged.
        */
        if ( ! entry_in->leafkey )
        {
                POSTGIS_DEBUG(4, "[GIST] non-leafkey entry, returning input unaltered");
                PG_RETURN_POINTER(entry_in);
        }
 
        POSTGIS_DEBUG(4, "[GIST] processing leafkey input");
        entry_out = palloc(sizeof(GISTENTRY));
 
        /*
        ** Null key? Make a copy of the input entry and
        ** return.
        */
        if ( DatumGetPointer(entry_in->key) == NULL )
        {
                POSTGIS_DEBUG(4, "[GIST] leafkey is null");
                gistentryinit(*entry_out, (Datum) 0, entry_in->rel,
                              entry_in->page, entry_in->offset, false);
                POSTGIS_DEBUG(4, "[GIST] returning copy of input");
                PG_RETURN_POINTER(entry_out);
        }
 
        /* Extract our index key from the GiST entry. */
        result = gserialized_datum_get_box2df_p(entry_in->key, &bbox_out);
 
        /* Is the bounding box valid (non-empty, non-infinite)? If not, return input uncompressed. */
        if ( result == LW_FAILURE )
        {
                box2df_set_empty(&bbox_out);
                gistentryinit(*entry_out, PointerGetDatum(box2df_copy(&bbox_out)),
                              entry_in->rel, entry_in->page, entry_in->offset, false);
 
                POSTGIS_DEBUG(4, "[GIST] empty geometry!");
                PG_RETURN_POINTER(entry_out);
        }
 
        POSTGIS_DEBUGF(4, "[GIST] got entry_in->key: %s", box2df_to_string(&bbox_out));
 
        /* Check all the dimensions for finite values */
        if ( ! isfinite(bbox_out.xmax) || ! isfinite(bbox_out.xmin) ||
             ! isfinite(bbox_out.ymax) || ! isfinite(bbox_out.ymin) )
        {
                box2df_set_finite(&bbox_out);
                gistentryinit(*entry_out, PointerGetDatum(box2df_copy(&bbox_out)),
                              entry_in->rel, entry_in->page, entry_in->offset, false);
 
                POSTGIS_DEBUG(4, "[GIST] infinite geometry!");
                PG_RETURN_POINTER(entry_out);
        }
 
        /* Enure bounding box has minimums below maximums. */
        box2df_validate(&bbox_out);
 
        /* Prepare GISTENTRY for return. */
        gistentryinit(*entry_out, PointerGetDatum(box2df_copy(&bbox_out)),
                      entry_in->rel, entry_in->page, entry_in->offset, false);
 
        /* Return GISTENTRY. */
        POSTGIS_DEBUG(4, "[GIST] 'compress' function complete");
        PG_RETURN_POINTER(entry_out);
}

References box2df_copy(), box2df_set_empty(), box2df_set_finite(), box2df_to_string(), box2df_validate(), gserialized_datum_get_box2df_p(), LW_FAILURE, LW_SUCCESS, and result.

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