coalesce function issue
repair bug
fix test ClientTimeArithmeticQueryIT.testCoalesceFunction
Revert "fix test ClientTimeArithmeticQueryIT.testCoalesceFunction"

This reverts commit bff9bc411235283025b83c02e6f03ae5498b1c84.
update test
update imports
evaluating tru only if children was evaluated
update coalesce input params validating
drop table after test