[masklinn]

> From what I've read, the generated query plan is equivalent.

I believe at one point IN (values) was just sugar for = ANY(ARRAY(values)), don't know if that's still the case.

Still requires that your DB adapter supports array parameters though.

[snuxoll]

Alternatively, you can use a temp table and a join. Not ideal, but still safe from injection and should have roughly the same overhead in the database.