What should you do , if your datastage does not provide proper error message ..
The APT_CombinedOperatorController is part of the internal working of DataStage. When you hit compile, DataStage is going to try to tune your code by combining several of your stages into one section of code. This is the APT_CombinedOperator. Normally you see a more meaningful error in your log. It could be before or after this error.
If you don't see anything more meaningful add the environmental variable $APT_DISABLE_COMBINATION and set it equal to True. Recompile and run again. This will keep all of your stages separate and should yield you a more meaningful error message.
$APT_DISABLE_COMBINATION- this will turn off Data Stage’s attempt in optimizing your code for better performance, and will give you better information.
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