[jira] [Created] (CARBONDATA-3960) Column comment should be null by default when adding column

[Akash R Nilugal (Jira)]

David Cai created CARBONDATA-3960:
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             Summary: Column comment should be null by default when adding column
                 Key: CARBONDATA-3960
                 URL: https://issues.apache.org/jira/browse/CARBONDATA-3960
             Project: CarbonData
          Issue Type: Improvement
            Reporter: David Cai


1. create table

create table test_add_column_with_comment(
 col1 string comment 'col1 comment',
 col2 int,
 col3 string)
 stored as carbondata

2 . alter table

alter table test_add_column_with_comment add columns(
col4 string comment "col4 comment",
col5 int,
col6 string comment "")

3. describe table

describe test_add_column_with_comment

+--------+---------+------------+
|col_name|data_type|comment |
+--------+---------+------------+
|col1 |string |col1 comment|
|col2 |int |null |
|col3 |string |null |
|col4 |string |col4 comment|
|col5 |int | |
|col6 |string | |
+--------+---------+------------+

the comment of col5 is "" by default



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