Please post EXPLAIN ANALYZE output for the two queries.
As I wrote in my first post, I pasted this together with the two queries at pastebin.com:
http://pastebin.com/m3c0d1896 ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
