jt2594838 commented on pull request #2460:
URL: https://github.com/apache/iotdb/pull/2460#issuecomment-767963894


   For example, assuming we have 3 SGs: root.sg1, root.sg2, and root.sg3.
   And now we execute `SELECT * FROM root`, the removed code will convert this 
SQL into "SELECT root.sg1.*, root.sg2.*, root.sg3.*", while after the removal, 
the result may be "SELECT root.sg1, root.sg2, root.s3", which is apparently a 
different one.


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