[HACKERS] how correctly detoast a Datum value?

[Pavel Stehule]

Hello

I try to explicitly detoast a plpgsql var, but I this code breaks a content.

what is wrong?

        switch (datum->dtype)
        {
                case PLPGSQL_DTYPE_VAR:
                        {
                                PLpgSQL_var *var = (PLpgSQL_var *) datum;

                                *typeid = var->datatype->typoid;
                                *typetypmod = var->datatype->atttypmod;
                                *isnull = var->isnull;

                                /*.
                                 * explicitly detoasting a possible
toasted values,
                                 * should to protect us under repeated
detoasting.
                                 * and decomprimiting
                                 */
                                if (!*isnull &&
!var->datatype->typbyval && var->datatype->typlen == -1)
                                {
                                        struct varlena *datum =
PG_DETOAST_DATUM(var->value);

                                        if ((Pointer) datum !=
DatumGetPointer(var->value))
                                        {
                                                free_var(var);
                                                var->value =
PointerGetDatum(datum);
                                        }
                                        *value = var->value;
                                }
                                else
                                        *value = var->value;

                                break;
                        }

Regards

Pavel Stehule

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