SQL: Support CASE-style filtered count distinct.#5047
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fjy merged 1 commit intoapache:masterfrom Nov 14, 2017
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i.e., aggregations like COUNT(DISTINCT CASE WHEN x THEN y END). This patch also changes complex columns to report as nullable, which is required for them to type-check properly when used in these kinds of filtered aggregations.
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i.e., aggregations like COUNT(DISTINCT CASE WHEN x THEN y END). This
patch also changes complex columns to report as nullable, which
is required for them to type-check properly when used in these kinds
of filtered aggregations.