[jira] [Created] (CALCITE-3182) Trim unused fields for plan of materialized-view before matching.

["jin xing (JIRA)" <ji...@apache.org>]

jin xing created CALCITE-3182:
---------------------------------

             Summary: Trim unused fields for plan of materialized-view before matching.
                 Key: CALCITE-3182
                 URL: https://issues.apache.org/jira/browse/CALCITE-3182
             Project: Calcite
          Issue Type: Improvement
            Reporter: jin xing


In current code, before matching query with materialized-view, unused fields of query is trimed but materialized-view is not. Thus below simple SQL fails to be matched though query and materialized-
view are exactly the same
```
 @Test public void testMaterializationAfterTrimingOfUnusedFields() {
 String sql =
 "select \"y\".\"deptno\", \"y\".\"name\", \"x\".\"sum_salary\"\n" +
 "from\n" +
 " (select \"deptno\", sum(\"salary\") \"sum_salary\" from \"emps\" group by \"deptno\") \"x\"\n" +
 " join\n" +
 " \"depts\" \"y\"\n" +
 " on \"x\".\"deptno\"=\"y\".\"deptno\"\n";
 checkMaterialize(sql, sql);
 }
```
Checking \{{CalciteMaterializer}} https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/prepare/CalciteMaterializer.java#L83 , I think the code intends to do the trimming, but didn't call the method.
Since query is trimed for unused fields in anyway https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/prepare/CalcitePrepareImpl.java#L995 , thus I think there's no n
ecessity to keep the materialized-view un-trimmed



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