[GitHub] [spark] LiShuMing commented on issue #24792: [SPARK-27953][SQL] Save default constraint with Column into table properties when create Hive table

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LiShuMing commented on issue #24792: [SPARK-27953][SQL] Save default constraint with Column into table properties when create Hive table
URL: https://github.com/apache/spark/pull/24792#issuecomment-561152957
 
 
   > @gatorsmile The design doc of default constraint is ready.
   
   what's the progress of this pr?  As https://issues.apache.org/jira/browse/SPARK-29119 also associate with this pr.
   
   I think this will be a useful function for users to handle default value or computed columns;
   
    @beliefer You can put your design doc on the Google Docs for more details and add comparisons with other engines, eg:
   - Oracle: https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj30540.html#rrefsqlj30540__sqlj64478
   - Postgres: https://issues.apache.org/jira/browse/SPARK-29119
   - Mysql: https://dev.mysql.com/doc/refman/5.6/en/constraints.html
   - Cockroach: https://www.cockroachlabs.com/docs/stable/default-value.html
   

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