renevan10 opened a new pull request #8727: Estimate rollup ratio for a datasource URL: https://github.com/apache/incubator-druid/pull/8727 This PR adds a dialog to preview and estimate rollup of a datasource under the datasources section. The top 20 rows of the datasource will be previewed. The user may get the estimated rollup ratio by: - changing the interval of the data, - selecting columns to exclude for the rollup(which will highlight the entire column in grey) - changing the granularity If the ingested data was previously rolled up, the original rollup ratio will also be displayed.  Note that at least one column must be de-selected for the calculation.
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