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https://issues.apache.org/jira/browse/KYLIN-3957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818570#comment-16818570
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ASF GitHub Bot commented on KYLIN-3957:
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nichunen commented on pull request #607: KYLIN-3957 Fix exception cannot cast
'java.math.BigDecimal' to 'java.…
URL: https://github.com/apache/kylin/pull/607
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> Query system_cube get exception Cannot cast "java.math.BigDecimal" to
> "java.lang.Double"
> ----------------------------------------------------------------------------------------
>
> Key: KYLIN-3957
> URL: https://issues.apache.org/jira/browse/KYLIN-3957
> Project: Kylin
> Issue Type: Bug
> Components: Query Engine
> Reporter: Chao Long
> Assignee: Chao Long
> Priority: Major
>
> In system cube, the return dataType of column whose real dataType is Double
> will be converted to Decimal in SUM measure.
> {code:java}
> FunctionDesc function = new FunctionDesc();
> function.setExpression(FunctionDesc.FUNC_SUM);
> function.setParameter(parameterDesc);
>
> function.setReturnType(dataType.equals(HiveTableCreator.HiveTypeEnum.HDOUBLE.toString())
> ? HiveTableCreator.HiveTypeEnum.HDECIMAL.toString()
> : dataType);
> {code}
> but query with that measure will get exception:
> {code}
> Caused by: org.codehaus.commons.compiler.CompileException: Line 108, Column
> 44: Cannot cast "java.math.BigDecimal" to "java.lang.Double"
> at
> org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:10092)
> at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:3839)
> at org.codehaus.janino.UnitCompiler.access$6400(UnitCompiler.java:183)
> at org.codehaus.janino.UnitCompiler$10.visitCast(UnitCompiler.java:3246)
> at org.codehaus.janino.Java$Cast.accept(Java.java:3802)
> at org.codehaus.janino.UnitCompiler.compileGet(UnitCompiler.java:3278)
> at org.codehaus.janino.UnitCompiler.compileGet2(UnitCompiler.java:3845)
> at org.codehaus.janino.UnitCompiler.access$8600(UnitCompiler.java:183)
> at
> org.codehaus.janino.UnitCompiler$10.visitParenthesizedExpression(UnitCompiler.java:3274)
> at
> org.codehaus.janino.Java$ParenthesizedExpression.accept(Java.java:3830)
> {code}
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