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ASF GitHub Bot commented on DRILL-4201: --------------------------------------- Github user jinfengni commented on the pull request: https://github.com/apache/drill/pull/305#issuecomment-165567570 @amansinha100 , could you please review the patch for DRILL-4201? Thanks! > DrillPushFilterPastProject should allow partial filter pushdown. > ----------------------------------------------------------------- > > Key: DRILL-4201 > URL: https://issues.apache.org/jira/browse/DRILL-4201 > Project: Apache Drill > Issue Type: Bug > Components: Query Planning & Optimization > Reporter: Jinfeng Ni > Assignee: Jinfeng Ni > Fix For: 1.5.0 > > > Currently, DrillPushFilterPastProjectRule will stop pushing the filter down, > if the filter itself has ITEM or FLATTEN function, or its input reference is > referring to an ITEM or FLATTEN function. However, in case that the filter is > a conjunction of multiple sub-filters, some of them refer to ITEM or FLATTEN > but the other not, then we should allow partial filter to be pushed down. For > instance, > WHERE partition_col > 10 and flatten_output_col = 'ABC'. > The "flatten_output_col" comes from the output of FLATTEN operator, and > therefore flatten_output_col = 'ABC' should not pushed past the project. But > partiion_col > 10 should be pushed down, such that we could trigger the > pruning rule to apply partition pruning. > It would be improve Drill query performance, when the partially pushed filter > leads to partition pruning, or the partially pushed filter results in early > filtering in upstream operator. -- This message was sent by Atlassian JIRA (v6.3.4#6332)