Paul Rogers 8ce03eb094
Convert the Druid planner to use statement handlers (#12905)
* Converted Druid planner to use statement handlers

Converts the large collection of if-statements for statement
types into a set of classes: one per supported statement type.
Cleans up a few error messages.

* Revisions from review comments

* Build fix

* Build fix

* Resolve merge confict.

* More merges with QueryResponse PR

* More parameterized type cleanup

Forces a rebuild due to a flaky test
2022-09-19 11:58:45 +05:30
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