[GitHub] [hive] nishantmonu51 opened a new pull request #723: [HIVE-20683] Add the Ability to push Dynamic Between and Bloom filters to Druid

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nishantmonu51 opened a new pull request #723: [HIVE-20683] Add the Ability to push Dynamic Between and Bloom filters to Druid
URL: https://github.com/apache/hive/pull/723
 
 
   Implementation details -
   
   * Hive generates and passes the filters as part of 'filterExpr' in TableScan.
   * DruidQueryBasedRecordReader gets this filter passed as part of the conf.
   * During execution phase, before sending the query to druid in DruidQueryBasedRecordReader we will deserialize this filter, translate it into a DruidDimFilter and add it to existing DruidQuery. Tez executor already ensures that when we start reading results from the record reader, all the dynamic values are initialized.
   * Explaining a druid query also prints the query sent to druid as druid.json.query. We also need to make sure to update the druid query with the filters. During explain we do not have the actual values for the dynamic values, so instead of values we will print the dynamic expression itself as part of druid query.
   

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