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https://issues.apache.org/jira/browse/DRILL-5065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abhishek Girish closed DRILL-5065.
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> 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
> Fix For: 1.10.0
>
>
> 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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