[jira] [Closed] (QUICKSTEP-69) Query optimization with ExactFilter.

["Jianqiao Zhu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/QUICKSTEP-69?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jianqiao Zhu closed QUICKSTEP-69.
---------------------------------
    Resolution: Implemented

The feature has been implemented with PR #172.

> Query optimization with ExactFilter.
> ------------------------------------
>
>                 Key: QUICKSTEP-69
>                 URL: https://issues.apache.org/jira/browse/QUICKSTEP-69
>             Project: Apache Quickstep
>          Issue Type: Improvement
>          Components: Query Optimizer, Relational Operators, Utility
>            Reporter: Jianqiao Zhu
>            Assignee: Jianqiao Zhu
>
> This is a follow-up optimization based on the facility provided by LIPFilters. Note that LIP (lookahead information passing) filter is an optimization that we can inject bloom filters (created somewhere else) into Select/HashJoin/Aggregate operators to pre-filter the input relations.
> This PR strength-reduces HashJoins (including inner/semi/anti joins) into FilterJoins. The semantics of a FilterJoin is simple: if certain conditions are met, we can build a bit vector from the build side and use the bit vector to FILTER the probe side.
> The execution part is slightly more optimized: a FIlterJoin will not always be converted into a SelectOperator plus a LIPFilter as its semantics indicates. Instead, in most situations we can avoid creating the SelectOperator and attach the LIPFilter properly to some downstream operators -- thus avoid unnecessary materialization of intermediate relations.



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