[ https://issues.apache.org/jira/browse/HIVE-12728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15068484#comment-15068484 ]
Gunther Hagleitner commented on HIVE-12728: ------------------------------------------- Comments on rb. > Apply DDL restrictions for ORC schema evolution > ----------------------------------------------- > > Key: HIVE-12728 > URL: https://issues.apache.org/jira/browse/HIVE-12728 > Project: Hive > Issue Type: Bug > Affects Versions: 2.0.0, 2.1.0 > Reporter: Prasanth Jayachandran > Assignee: Prasanth Jayachandran > Priority: Critical > Attachments: HIVE-12728.1.patch > > > HIVE-11981 added schema evolution for ORC. However, it does not enforce any > restrictions in DDL that can break schema evolution. Following changes have > to be enforced in DDL to support the assumptions in schema evolution (that > columns will only be added). > 1) Restrict changing the file format of the table > 2) Restrict changing the serde of the table > 3) Restrict replacing columns > 4) Restrict reordering columns > 5) Restrict unsupported type promotions -- This message was sent by Atlassian JIRA (v6.3.4#6332)