psycopg 2.4 doesn't allow % in bind names anymore

[Mike Bayer]

e.g. test/sql/test_query PercentSchemaNames test, ideally we'd get bind param names to be somewhat "safe" against odd characters. not sure if this is in the dialect or expression system.

[Mike Bayer]

i really can't see ever doing anything about this. the % in bind names follows from that you might have used them in column names and overall it's really not a postgresql use case.