[jira] [Created] (CALCITE-4321) Filter Where Expressions Missing From JDBC SQL

["Jeremiah Rhoads Hall (Jira)" <ji...@apache.org>]

Jeremiah Rhoads Hall created CALCITE-4321:
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             Summary: Filter Where Expressions Missing From JDBC SQL
                 Key: CALCITE-4321
                 URL: https://issues.apache.org/jira/browse/CALCITE-4321
             Project: Calcite
          Issue Type: Bug
         Environment: MacOS 10.15, Java 11, PostgreSQL 12
            Reporter: Jeremiah Rhoads Hall


Hi there. I tried out the pivot feature added in https://issues.apache.org/jira/browse/CALCITE-3752 and found what I think is a bug where the JDBC adapter will not generate `FILTER (WHERE ...)` expressions from relational expressions.

Initially, I noticed that the SQL that was generated when trying out the pivot featue was missing the filter-where, but even when included directly in the Calcite SQL it's not in the SQL issued by the JDBC adapter.

For example if I try to execute the following with Calcite:
{code:java}
select sum(amount) filter (where some_date_column = '2020-10-01') from my_table{code}
The SQL issued by the adapter will be:
{code:java}
select sum(amount) from my_table
{code}
I have a small change here with a test case and a fix: https://github.com/apache/calcite/pull/2204



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