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Document the min/max ifdefined and alldefined aggregation variants New pages for min_ifdefined, max_ifdefined, min_alldefined and max_alldefined (20.10.0 and later), listed in Aggregation functions. Also states on the min and max pages what those two do with groups that have no values -- they yield the value type's extreme, which is easy to mistake for a real measurement -- and points to the new variants that yield null instead. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>