gserialized_gist_penalty_2d()

Datum gserialized_gist_penalty_2d

(

PG_FUNCTION_ARGS

)

Definition at line 1186 of file gserialized_gist_2d.c.

{
        GISTENTRY *origentry = (GISTENTRY*) PG_GETARG_POINTER(0);
        GISTENTRY *newentry = (GISTENTRY*) PG_GETARG_POINTER(1);
        float *result = (float*) PG_GETARG_POINTER(2);
        BOX2DF *b1, *b2;
 
        b1 = (BOX2DF *)DatumGetPointer(origentry->key);
        b2 = (BOX2DF *)DatumGetPointer(newentry->key);
 
        /* Penalty value of 0 has special code path in Postgres's gistchoose.
         * It is used as an early exit condition in subtree loop, allowing faster tree descend.
         * For multi-column index, it lets next column break the tie, possibly more confidently.
         */
        *result = 0;
 
        if (b1 && b2 && !box2df_is_empty(b1) && !box2df_is_empty(b2))
                *result = box2df_penalty(b1, b2);
 
        PG_RETURN_POINTER(result);
}

References box2df_is_empty(), and box2df_penalty().

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