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From "Jan Van Besien (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CALCITE-1427) Code generation incorrect (does not compile) for DATE, TIME and TIMESTAMP fields
Date Tue, 11 Oct 2016 07:56:20 GMT
Jan Van Besien created CALCITE-1427:
---------------------------------------

             Summary: Code generation incorrect (does not compile) for DATE, TIME and TIMESTAMP
fields
                 Key: CALCITE-1427
                 URL: https://issues.apache.org/jira/browse/CALCITE-1427
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: Jan Van Besien
            Assignee: Julian Hyde


The generated code for sql queries that filter on DATE, TIME or TIMESTAMP fields is incorrect.

The problem can easily be reproduced with the csv example using a statement such as (patch
with unit test in attachment).

{code}
select EMPNO from "DATE" where JOINEDAT is not null;
{code}

or (similar but not exactly the same problem)

{code}
select EMPNO from "DATE" where JOINEDAT > {d '1990-01-01'};
{code}

In case of the not-null filter, the generated code contains

{code}
if (org.apache.calcite.runtime.SqlFunctions.internalToDate(((Object[]) inputEnumerator.current())[1])
!= null) {...}
{code}

This seems to be generated in the assumption that the internal representation is a long, rather
than a java.sql.Date, java.sql.Time or java.sql.Timestamp.

So first question: is the enumerator supposed to return java.sql.Date, java.sql.Time and java.sql.Timestamp
values or simply longs (epoch millis). Currently it returns java.sql.* types and that is definitely
how it used to work in older calcite versions.

In that case the generated code should probably not contain the internalToDate function?

However the mere existence of that function makes me think that maybe the enumerators are
supposed to return long values. But in that case the generated code is also wrong, it should
probably be (added cast):

{code}
if (((Long)((Object[]) inputEnumerator.current())[1]) != null) {...}
{code}

With the second sql query (greater than filter), the generated code actually does contain
a cast to Integer (which fails):

{code}
final Integer inp1_ = (Integer) ((Object[]) inputEnumerator.current())[1];
if (inp1_ != null && inp1_.intValue() > 7305) {...}
{code}

The cast fails with java.sql.Date cannot be cast to java.lang.Integer



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