add docs for aggregation function uniq_theta - #4019
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Add documentation for the
uniq_thetaaggregate function (theta-sketch based approximate distinct count), following the pattern of #3711 (datasketches_hll_union_agg).Corresponds to the BE/FE implementation PR that adds
uniq_thetato Apache Doris.Includes:
currentandversion-4.xsidebars.tsandversioned_sidebars/version-4.x-sidebars.jsonThe docs cover the basic aggregate usage across types, NULL handling, GROUP BY, empty-result behavior, and the auto-derived
uniq_theta_state/uniq_theta_merge/uniq_theta_unionagg_state combinators.