[jira] [Created] (CALCITE-793) The compiler asks for unnecessary collation trait on plan with materialized view

["Maryann Xue (JIRA)" <ji...@apache.org>]

Maryann Xue created CALCITE-793:
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             Summary: The compiler asks for unnecessary collation trait on plan with materialized view
                 Key: CALCITE-793
                 URL: https://issues.apache.org/jira/browse/CALCITE-793
             Project: Calcite
          Issue Type: Bug
    Affects Versions: 1.4.0-incubating
            Reporter: Maryann Xue
            Assignee: Julian Hyde
             Fix For: next


When a query does not have an ORDER BY clause, we should ignore the collation trait of the main table plan and should not request the materialized view plan to have the same collation.

For example, we have a table 'A' sorted by primary key 'id', and we have a materialized view 'V' projected from 'A' which is sorted by column 'col1'. And now we have a query like "select id, col0, col1, col2 from A where col1 < '10'".
The main table plan will come out like a Filter on top of a TableScan of 'A', while the materialized view plan should also be something like a Filter on top of a TableScan of 'V' and it should not have a Sort, so that if doing a col1 related filter on col1 ordered table 'V' is cheaper, the materialized view plan will be chosen.



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