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[CARBONDATA-4014] Support Change Column Comment
Why is this PR needed? Now, we support add comment when CREATE TABLE and ADD COLUMN. but do not support alter comment of specified column. We shall support alter comment 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 Is any new testcase added? Yes
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