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https://issues.apache.org/jira/browse/FLINK-36097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17875043#comment-17875043
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Jiabao Sun commented on FLINK-36097:
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The avgObjSize is also returned from the `$collStats` aggregation.
> Add timeseries support for SampleSplitter
> -----------------------------------------
>
> Key: FLINK-36097
> URL: https://issues.apache.org/jira/browse/FLINK-36097
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / MongoDB
> Affects Versions: mongodb-1.2.0
> Reporter: Jiabao Sun
> Assignee: Jiabao Sun
> Priority: Minor
>
> Timeseries collections do not return a count from the `$collStats`
> aggregation.
> In this case, it is necessary to use the `countDocuments` method to get the
> exact count of documents in the collection, to avoid split into a single
> split.
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