vlsi commented on pull request #2433:
URL: https://github.com/apache/calcite/pull/2433#issuecomment-860024076


   ```
    Caused by: org.codehaus.commons.compiler.InternalCompilerException: Line 
61, Column 17: org.codehaus.commons.compiler.InternalCompilerException: Operand 
stack underflow
                                           at 
org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2393)
                                           at 
org.codehaus.janino.UnitCompiler.access$1800(UnitCompiler.java:231)
                                           at 
org.codehaus.janino.UnitCompiler$6.visitExpressionStatement(UnitCompiler.java:1530)
                                           at 
org.codehaus.janino.UnitCompiler$6.visitExpressionStatement(UnitCompiler.java:1523)
                                           at 
org.codehaus.janino.Java$ExpressionStatement.accept(Java.java:3198)
                                           at 
org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:1523)
                                           at 
org.codehaus.janino.UnitCompiler.compileStatements(UnitCompiler.java:1607)
                                           at 
org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:3531)
                                           at 
org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:3218)
                                           ... 75 more
                                           Caused by: 
org.codehaus.commons.compiler.InternalCompilerException: Operand stack underflow
                                               at 
org.codehaus.janino.StackMap.peekOperand(StackMap.java:94)
                                               at 
org.codehaus.janino.CodeContext.popOperand(CodeContext.java:1349)
                                               at 
org.codehaus.janino.UnitCompiler.putfield(UnitCompiler.java:12363)
                                               at 
org.codehaus.janino.UnitCompiler.compileSet2(UnitCompiler.java:6498)
                                               at 
org.codehaus.janino.UnitCompiler.access$13400(UnitCompiler.java:231)
                                               at 
org.codehaus.janino.UnitCompiler$20.visitFieldAccess(UnitCompiler.java:6480)
                                               at 
org.codehaus.janino.UnitCompiler$20.visitFieldAccess(UnitCompiler.java:6475)
                                               at 
org.codehaus.janino.Java$FieldAccess.accept(Java.java:4668)
                                               at 
org.codehaus.janino.UnitCompiler.compileSet(UnitCompiler.java:6475)
                                               at 
org.codehaus.janino.UnitCompiler.compileSet2(UnitCompiler.java:6489)
                                               at 
org.codehaus.janino.UnitCompiler.access$13200(UnitCompiler.java:231)
                                               at 
org.codehaus.janino.UnitCompiler$20.visitAmbiguousName(UnitCompiler.java:6478)
                                               at 
org.codehaus.janino.UnitCompiler$20.visitAmbiguousName(UnitCompiler.java:6475)
                                               at 
org.codehaus.janino.Java$AmbiguousName.accept(Java.java:4574)
                                               at 
org.codehaus.janino.UnitCompiler.compileSet(UnitCompiler.java:6475)
                                               at 
org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:3992)
                                               at 
org.codehaus.janino.UnitCompiler.access$6000(UnitCompiler.java:231)
                                               at 
org.codehaus.janino.UnitCompiler$12.visitAssignment(UnitCompiler.java:3944)
                                               at 
org.codehaus.janino.UnitCompiler$12.visitAssignment(UnitCompiler.java:3924)
                                               at 
org.codehaus.janino.Java$Assignment.accept(Java.java:4835)
                                               at 
org.codehaus.janino.UnitCompiler.compile(UnitCompiler.java:3924)
                                               at 
org.codehaus.janino.UnitCompiler.compile2(UnitCompiler.java:2391)
                                               ... 83 more
   ```
   
   It looks like an error that is worth reporting to janino.


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