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opt: add support for aggregate FILTER
This commit introduces support for FILTERing individual aggregates in a group by. One unintuitive change is that if we have a COUNT(*) with a FILTER, we need to synthesize an input for the aggregation to be over, because otherwise we have no input to hang the AggFilter off of. Thus, we convert COUNT(*) FILTER (WHERE foo) to COUNT(true) FILTER (WHERE foo). This isn't a problem for DISTINCT because COUNT(DISTINCT *) is not valid. Release note (sql change): FILTER expressions are now supported by the cost-based optimizer.
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Justin Jaffray
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Jan 22, 2019
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