julianhyde commented on issue #7953: Exact distinct-COUNT with complex expression (CASE, IN) throws NullPointerException URL: https://github.com/apache/incubator-druid/issues/7953#issuecomment-507523316 I tried to fix this in Calcite. I needed to modify the "A1" case in the rule to exclude the `GROUPING` aggregate function: ``` } else if ((RexLiteral.isNullLiteral(arg2) /* Case A1 */ && aggregateCall.getAggregation().getKind() != SqlKind.GROUPING) || (aggregateCall.getAggregation().getKind() == SqlKind.SUM && isIntLiteral(arg2) && RexLiteral.intValue(arg2) == 0) /* Case A2 */) { ```
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