Re: gist access methods parameter types

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От Marios Vodas
Тема Re: gist access methods parameter types
Дата
Msg-id AANLkTi=TYUrWad9wO_mj9WeRZeYEYOgwc45-ZLYhbf_Y@mail.gmail.com
обсуждение исходный текст
Ответ на Re: gist access methods parameter types  (Marios Vodas <mvodas@gmail.com>)
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Please can you answer the question of whether entry->key in compress should be of delta3d sql type (composite type) and if not of what it should be since the type I index is different from the type stored in tree?
Taking into consideration the types I described before this is my code for compress.

Datum delta3d_compress(PG_FUNCTION_ARGS) {
    GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY *retval;

    HeapTupleHeader in;
    HeapTupleHeader i;
    HeapTupleHeader e;
    bool isnull;

    if (entry->leafkey) {
        in = DatumGetHeapTupleHeader(entry->key);

        if (in != NULL) {
            i = DatumGetHeapTupleHeader(GetAttributeByName(in, "i", &isnull));
            e = DatumGetHeapTupleHeader(GetAttributeByName(in, "e", &isnull));

            delta3d *compressed_data = (delta3d *) palloc(sizeof (delta3d));
            compressed_data->xi = DatumGetFloat8(GetAttributeByName(i, "x", &isnull));
            compressed_data->yi = DatumGetFloat8(GetAttributeByName(i, "y", &isnull));
            compressed_data->ti = DatumGetTimestamp(GetAttributeByName(i, "t", &isnull));
            compressed_data->xe = DatumGetFloat8(GetAttributeByName(e, "x", &isnull));
            compressed_data->ye = DatumGetFloat8(GetAttributeByName(e, "y", &isnull));
            compressed_data->te = DatumGetTimestamp(GetAttributeByName(e, "t", &isnull));
            compressed_data->trajectory = DatumGetInt32(GetAttributeByName(in, "trajectory", &isnull));

            retval = palloc(sizeof (GISTENTRY));
            gistentryinit(*retval, PointerGetDatum(compressed_data), entry->rel, entry->page, entry->offset, FALSE);
        } else {
            retval = palloc(sizeof (GISTENTRY));
            gistentryinit(*retval, (Datum) 0, entry->rel, entry->page, entry->offset, FALSE);
        }
    } else {
        retval = entry; //does this have to change? I thing it is going to be of C type delta3d_mbb, am I right?
    }

    PG_RETURN_POINTER(retval);
}

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