FoundationDB/sql-layer — pull request #1571 by nathanlws (2014-12-09 17:00:06+00:00)
Title: Unify NULLIF scalar, IFNULL and IF argument type resolution to picking.

IF, NULLIF, IFNULL and COALESCE all be have the same (with respect to argument types) now.

Depends on FoundationDB/sql-parser#159