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* Add SpectatorHistogram extension * Clarify documentation Cleanup comments * Use ColumnValueSelector directly so that we support being queried as a Number using longSum or doubleSum aggregators as well as a histogram. When queried as a Number, we're returning the count of entries in the histogram. * Apply suggestions from code review Co-authored-by: Victoria Lim <vtlim@users.noreply.github.com> * Fix references * Fix spelling * Update docs/development/extensions-contrib/spectator-histogram.md Co-authored-by: Victoria Lim <vtlim@users.noreply.github.com> --------- Co-authored-by: Victoria Lim <vtlim@users.noreply.github.com>
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![](/Apache/druid/raw/commit/19ed5c863f5ae660111c4ec6d595bb93d4154f95/docs/assets/spectator-histogram-size-comparison.png)