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https://issues.apache.org/jira/browse/DRILL-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15743703#comment-15743703
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Sudheesh Katkam commented on DRILL-5065:
----------------------------------------
Fixed in
[97da019|https://github.com/apache/drill/commit/97da01995ecfd9a7d157ad183f0656cd15993f26]
> Optimize count( *) queries on MapR-DB JSON Tables
> -------------------------------------------------
>
> Key: DRILL-5065
> URL: https://issues.apache.org/jira/browse/DRILL-5065
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - MapRDB
> Affects Versions: 1.9.0
> Environment: Clusters with MapR v5.2.0 and above
> Reporter: Abhishek Girish
> Assignee: Smidth Panchamia
> Labels: ready-to-commit
>
> The JSON FileReader optimizes count(* ) queries, by only counting the number
> of records in the files and discarding the data. This makes the query
> execution faster & efficient.
> We need a similar feature in the MapR format plugin (maprdb) to optimize _id
> only projection & count(* ) queries on MapR-DB JSON Tables.
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