[jira] [Created] (KYLIN-1727) Calcite throws "ava.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Byte"

["Chaozhong Yang (JIRA)" <ji...@apache.org>]

Chaozhong Yang created KYLIN-1727:
-------------------------------------

             Summary: Calcite throws "ava.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Byte"
                 Key: KYLIN-1727
                 URL: https://issues.apache.org/jira/browse/KYLIN-1727
             Project: Kylin
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: v1.5.0, 1.x-HBase1.1.3
            Reporter: Chaozhong Yang
            Assignee: liyang


I got error from Kylin when try a simple sql like: select colum_a, sum(column_b) from table group by column_a

The stack trace is:
```
Caused by: java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Byte
        at Baz$4.apply(Unknown Source)
        at Baz$4.apply(Unknown Source)
        at Baz$4.apply(Unknown Source)
        at org.apache.calcite.linq4j.EnumerableDefaults.groupBy_(EnumerableDefaults.java:825)
        at org.apache.calcite.linq4j.EnumerableDefaults.groupBy(EnumerableDefaults.java:754)
        at org.apache.calcite.linq4j.DefaultEnumerable.groupBy(DefaultEnumerable.java:302)
        at Baz.bind(Unknown Source)
        at org.apache.calcite.jdbc.CalcitePrepare$CalciteSignature.enumerable(CalcitePrepare.java:326)
        at org.apache.calcite.jdbc.CalciteConnectionImpl.enumerable(CalciteConnectionImpl.java:281)
        at org.apache.calcite.jdbc.CalciteMetaImpl._createIterable(CalciteMetaImpl.java:545)
        at org.apache.calcite.jdbc.CalciteMetaImpl.createIterable(CalciteMetaImpl.java:536)
        at org.apache.calcite.avatica.AvaticaResultSet.execute(AvaticaResultSet.java:187)
        at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:65)
        at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:44)
        at org.apache.calcite.avatica.AvaticaConnection$1.execute(AvaticaConnection.java:566)
        at org.apache.calcite.jdbc.CalciteMetaImpl.prepareAndExecute(CalciteMetaImpl.java:578)
        at org.apache.calcite.avatica.AvaticaConnection.prepareAndExecuteInternal(AvaticaConnection.java:571)
        at org.apache.calcite.avatica.AvaticaStatement.executeInternal(AvaticaStatement.java:135)
        ... 79 more
```

In addition, the column "column_b" was declared as "tinyint" in hive.



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