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https://issues.apache.org/jira/browse/SQOOP-3132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123970#comment-16123970
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Sandish Kumar HN commented on SQOOP-3132:
-----------------------------------------
This is the ERROR [main] org.apache.sqoop.mapreduce.hcat.SqoopHCatExportHelper:
Cannot convert HCatalog object of type string to java object type
com.cloudera.sqoop.lib.ClobRef
> sqoop export from Hive table stored in Parquet format to Oracle CLOB column
> results in (null)
> ---------------------------------------------------------------------------------------------
>
> Key: SQOOP-3132
> URL: https://issues.apache.org/jira/browse/SQOOP-3132
> Project: Sqoop
> Issue Type: Bug
> Components: connectors/oracle, hive-integration
> Affects Versions: 1.4.6
> Environment: sandbox
> Reporter: Ramprasad
> Assignee: Sandish Kumar HN
> Priority: Critical
> Labels: beginner
>
> I am trying to export a String column from Hive table (stored in Parquet
> format) to Oracle CLOB data type column using sqoop export. Below are the
> commands I run for creation of tables in Oracle & Hive and, the sqoop command
> I use to to export the data.
> Table creation & insert into Hive:
> create table default.sqoop_oracle_clob_test (sample_id int, verylargestring
> String) stored as PARQUET;
> [SUCCESS]
> insert into default.sqoop_oracle_clob_test (sample_id, verylargestring)
> values (123, "Really a very large String");
> insert into default.sqoop_oracle_clob_test (sample_id, verylargestring)
> values (456, "Another very large String");
> [SUCCESS]
> Table creation in Oracle
> create table sqoop_exported_oracle (sample_id NUMBER, verylargestring CLOB);
> [success]
> Sqoop export command:
> sqoop \
> export \
> --connect jdbc:oracle:thin:@//host:port/database_name \
> --username ****** \
> --password ****** \
> --table sqoop_exported_oracle \
> --columns SAMPLE_ID,VERYLARGESTRING \
> --map-column-java "VERYLARGESTRING=String" \
> --hcatalog-table "sqoop_oracle_clob_test" \
> --hcatalog-database "default"
> sqoop job executes fine without any error messages and displays the message
> Exported 2 records.
> The result in Oracle table is as below,
> select * from sqoop_exported_oracle;
> sample_id | verylargestring
> 123 | (null)
> 456 | (null)
> I tried using --staging-table as well but, resulted in same. I suspect this
> is a bug while exporting to oracle CLOB columns when retrieving from Hive
> which is stored in parquet format.
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