[ https://issues.apache.org/jira/browse/HIVE-17333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277046#comment-16277046 ]
Naveen Gangam commented on HIVE-17333: -------------------------------------- [~aihuaxu] Could you please review this change? Thanks Here is the output from running it against oracle. I used temp tables instead of the actual ones in this test. {code} SQL> create table COLUMNS_V2_1 as select * from COLUMNS_V2; create table TABLE_PARAMS_1 as select * from TABLE_PARAMS; create table SERDE_PARAMS_1 as select * from SERDE_PARAMS; create table SD_PARAMS_1 as select * from SD_PARAMS; ALTER TABLE COLUMNS_V2_1 ADD (TEMP CLOB); UPDATE COLUMNS_V2_1 SET TEMP=TYPE_NAME; ALTER TABLE COLUMNS_V2_1 DROP COLUMN TYPE_NAME; ALTER TABLE COLUMNS_V2_1 RENAME COLUMN TEMP TO TYPE_NAME; ALTER TABLE TABLE_PARAMS_1 ADD (TEMP CLOB); UPDATE TABLE_PARAMS_1 SET TEMP=PARAM_VALUE, PARAM_VALUE=NULL; ALTER TABLE TABLE_PARAMS_1 DROP COLUMN PARAM_VALUE; ALTER TABLE TABLE_PARAMS_1 RENAME COLUMN TEMP TO PARAM_VALUE; ALTER TABLE SERDE_PARAMS_1 ADD (TEMP CLOB); UPDATE SERDE_PARAMS_1 SET TEMP=PARAM_VALUE, PARAM_VALUE=NULL; ALTER TABLE SERDE_PARAMS_1 DROP COLUMN PARAM_VALUE; ALTER TABLE SERDE_PARAMS_1 RENAME COLUMN TEMP TO PARAM_VALUE; ALTER TABLE SD_PARAMS_1 ADD (TEMP CLOB); UPDATE SD_PARAMS_1 SET TEMP=PARAM_VALUE, PARAM_VALUE=NULL; ALTER TABLE SD_PARAMS_1 DROP COLUMN PARAM_VALUE; ALTER TABLE SD Table created. SQL> Table created. SQL> Table created. SQL> _PARAMS_1 RENAME COLUMN TEMP TO PARAM_VALUE; Table created. SQL> SQL> SQL> Table altered. SQL> 211 rows updated. SQL> Table altered. SQL> Table altered. SQL> SQL> Table altered. SQL> 12 rows updated. SQL> Table altered. SQL> Table altered. SQL> SQL> Table altered. SQL> 2 rows updated. SQL> Table altered. SQL> Table altered. SQL> SQL> Table altered. {code} > Schema changes in HIVE-12274 for Oracle may not work for upgrade > ---------------------------------------------------------------- > > Key: HIVE-17333 > URL: https://issues.apache.org/jira/browse/HIVE-17333 > Project: Hive > Issue Type: Bug > Components: Metastore > Affects Versions: 3.0.0 > Reporter: Naveen Gangam > Assignee: Naveen Gangam > Attachments: HIVE-17333.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)