[HIVE-17333] Schema changes in HIVE-12274 for Oracle may not work for upgrade

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 2.3.0, 3.0.0
• Component/s: Metastore
• Assignee: Naveen Gangam
• Reporter: Naveen Gangam
• Created: 16/Aug/17 14:18
• Updated: 22/May/18 23:58
• Resolved: 07/Dec/17 15:42

Description

According to https://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1770086700346491686 (reported in HIVE-12274)
The alter table command to change the column datatype from VARCHAR to CLOB may not work. So the correct way to accomplish this is to add a new temp column, copy the value from the current column, drop the current column and rename the new column to old column.