The bug was caused by makeExprEvalSelector returning a null object, which it isn't supposed to do. Fixed this by renaming ConstantColumnValueSelector to ConstantExprEvalSelector (it was only used for ExprEval anyway) and putting logic in that class to make sure the selectors behave as expected.
[ Full content available at: https://github.com/apache/incubator-druid/pull/6232 ] This message was relayed via gitbox.apache.org for [email protected]
