Affected rows count with queries returning data?

[0x777]

data WithAffectedRows a 
  = WithAffectedRows Int64 a

withAffectedRows :: Result a -> Result (WithAffectedRows a)

Useful when using returning in insert/update/delete queries.

UPDATE t SET x = 1 WHERE y = 2 RETURNING id;

[nikita-volkov]

Sorry. I somehow missed this issue. What makes this case special? You're still receiving a vector of "id" columns, which you can just as well measure the length of.

I'm asking because I'm currently putting finishing touches on the new release of Hasql, and considering whether to do anything about this issue.

[0x777]

The length of the vector need not be computed. It can be extracted from the Result. Then again, getting the length of a vector is a constant time operation. So, I guess it doesn't add any significant advantage.