Commits on Sep 29, 2020

1. [CARBONDATA-4014] Support Change Column Comment …

   Why is this PR needed?
   Now, we support add column comment in "CREATE TABLE" and "ADD COLUMN". but do not support alter comment of the column, which shall be support in 'CHANGE COLUMN'
   
   What changes were proposed in this PR?
   Support "ALTER TABLE table_name CHANGE [COLUMN] col_name col_name data_type [COMMENT col_comment]"
   
   Does this PR introduce any user interface change?
   Yes. add CHANGE COLUMN explaination in the ddl document.
   
   Is any new testcase added?
   Yes

   

   marchpure committed Sep 29, 2020
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