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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