The PostgreSQL ANSI ODBC driver reports 42P18 - ERROR: could not determine data type of parameter $<n>; when preparing SQL with an expression of the form:
<bound parameter> IS NULL.
This is a breaking change to existing code that depends on being able to check the NULL-ness of a parameter.
Behavior is new as of psqlODBC 09.03.0100
PostgreSQL version: 9.3.2OS: Windows