On Tue, Feb 8, 2022, at 10:18 PM, tanghy.f...@fujitsu.com wrote:
> 2)
> + /*
> + * Check if the old tuple's attribute is stored externally and is a
> + * member of external_cols.
> + */
> + if (VARATT_IS_EXTERNAL((struct varlena *) DatumGetPointer(value1)) &&
> + bms_is_member(attrnum - FirstLowInvalidHeapAttributeNumber,
> +   external_cols))
> + *has_external = true;
> 
> If has_external is already true, it seems we don't need this check, so should 
> we
> check has_external first?
Is it worth it? I don't think so. It complicates a non-critical path. In
general, the condition will be executed once or twice.


--
Euler Taveira
EDB   https://www.enterprisedb.com/

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