Jackie-Jiang commented on issue #3539: PQL Support for generalized expressions in selection and aggregation URL: https://github.com/apache/incubator-pinot/issues/3539#issuecomment-440865972 I tried to implement it, but found the change is not trivial (don't remember the details). Selection should not be very hard to support, and does not requires architectural changes. But filter support would be hard, and the performance could be very bad because no index can be applied.
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