gianm commented on issue #7281: bump calcite version to 1.18.0 in druid-sql URL: https://github.com/apache/incubator-druid/pull/7281#issuecomment-485152834 > @gianm How about writing a new rule such as DruidReduceEqualNullRule which makes a=null as a='' when nessesary.. thanks That seems reasonable if it gets us the behavior we want. I'm not sure if we will be able to get 100% there, though, because consider operators like `COALESCE(x, y)`. In the default mode, we want this to return `y` if `x` is an empty string. But in SQL compliant mode, we want this to return `x` if `x` is an empty string (and return `y` if `x` is null). Right now, I think this works -- see "testCoalesceColumns" in CalciteQueryTest -- but it might be "by accident".
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