feat(tsi): optimize series iteration #22519
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When using queries like 'select count(_seriesKey) from bigmeasurement`, we should iterate over the tsi structures to serve the query instead of loading all the series into memory up front. Co-authored-by: Sam Arnold <sarnold@influxdata.com>
serenibyss
approved these changes
Sep 20, 2021
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Closes #22518
Backports #22316