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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