Consider the following query:
select 1 from foo where dir0 not in (1994) and col1 not in ('bar');
The filter condition is: AND(NOT(=($1, 1994)), NOT(=($2, 'bar')))
In FindPartitionCondition we rewrite the filter to cherry pick the partition column conditions so the interpreter can evaluate it, however when the expression contains more than two levels of nesting (in this case AND(NOT(=))) ) the expression does not get rewritten correctly. In this case the expression gets rewritten as: AND(=($1, 1994)). NOT is missing from the rewritten expression producing wrong results.