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From "Maryann Xue (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CALCITE-1182) Add ProjectRemoveRule to pre-processing program of materialization substitution
Date Sun, 03 Apr 2016 15:07:25 GMT
Maryann Xue created CALCITE-1182:
------------------------------------

             Summary: Add ProjectRemoveRule to pre-processing program of materialization substitution
                 Key: CALCITE-1182
                 URL: https://issues.apache.org/jira/browse/CALCITE-1182
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Maryann Xue
            Assignee: Maryann Xue
            Priority: Minor


In VolcanoPlanner, we apply a simple pre-processing hep program to normalize the "target"
and "query" rels before materialization substitution. Currently this program runs with two
rules: FilterProjectTransposeRule and ProjectMergeRule.
We need an extra rule ProjectRemoveRule for the Phoenix use case where a secondary index (modeled
as materialized views) is defined on a view so the materialized view "queryRel" may have an
identity projection introduced by this view.



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