jinxing64 commented on issue #1468: [CALCITE-3366] RelDecorrelator supports 
Union
URL: https://github.com/apache/calcite/pull/1468#issuecomment-535932476
 
 
   Hi @hsyuan @danny0405 
   In previous change, I failed the decorrelation of Union when input frames 
have different correlated variables or different old-new output mappings.
   
   Now in the current one, I resolve the limitation:
   1. when input frames with different correlated variables, I widen the frame 
by "value generator"
   2. when input frames with different old-new output mappings, I permute by a 
'Project'
   
   Really appreciate if you can take another look when you have time.
   
   Also gentle ping @julianhyde . Please give some advice if I'm on the right 
direction.

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