On 2021-Dec-14, Tomas Vondra wrote: > 7) There's a couple places doing this > > if (att_map != NULL && > !bms_is_member(att->attnum - FirstLowInvalidHeapAttributeNumber, > att_map) && > !bms_is_member(att->attnum - FirstLowInvalidHeapAttributeNumber, > idattrs) && > !replidentfull) > > which is really hard to understand (even if we get rid of the offset), so > maybe let's move that to a function with sensible name. Also, some places > don't check indattrs - seems a bit suspicious.
It is indeed pretty hard to read ... but I think this is completely unnecessary. Any column that is part of the identity should have been included in the column filter, so there is no need to check for the identity attributes separately. Testing just for the columns in the filter ought to be sufficient; and the cases "if att_map NULL" and "is replica identity FULL" are also equivalent, because in the case of FULL, you're disallowed from setting a column list. So this whole thing can be reduced to just this: if (att_map != NULL && !bms_is_member(att->attnum, att_map)) continue; /* that is, don't send this attribute */ so I don't think this merits a separate function. [ says he, after already trying to write said function ] -- Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/ "Before you were born your parents weren't as boring as they are now. They got that way paying your bills, cleaning up your room and listening to you tell them how idealistic you are." -- Charles J. Sykes' advice to teenagers