Internal language transformations section
Topic = Unknown parameter
File = http://db.apache.org/derby/docs/dev/tuning/rtuntransform472.html
There is a mention of rewriting queries - "Users can work around this possibility by writing the query like this (which is not optimizable):(country... ) LIKE ?". But this does not mention the rationale for doing so, which could be benefical for the users in understanding the transformation.