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https://issues.apache.org/jira/browse/SQOOP-489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13283912#comment-13283912
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Jarek Jarcec Cecho commented on SQOOP-489:
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I also do have one concern with automatic fix. This time, let me start with
example :-)
Let's consider table with three columns A, B and C with two rows - "1, 2, 3"
and "4, 5, 6". Also let say that we applied suggested fix and also solve the
issue with importing all columns. Sqoop command would contain --hive-partition
A --hive-value 666. Then file on HDFS would probably contain two rows - "2, 3"
and "5, 6". View on hive would be:
B C A
2 3 666
5 6 666
I do not see an issue with changing column ordering, however I'm concerned that
we silently ignored one column in the table and replaced it with constant value
from command line -- both values "1" and "4" from original table were lost.
I do not have easy solution to address this problem and therefore I would
suggest to fix this JIRA by gracefully exiting in case that user will specify
partition column as one of the exported columns.
Jarcec
> Cannot define partition keys for Hive tables created through Sqoop
> ------------------------------------------------------------------
>
> Key: SQOOP-489
> URL: https://issues.apache.org/jira/browse/SQOOP-489
> Project: Sqoop
> Issue Type: Bug
> Affects Versions: 1.4.1-incubating
> Reporter: Kathleen Ting
> Assignee: Cheolsoo Park
> Attachments: SQOOP-489.patch
>
>
> By enabling the table option, Sqoop includes every column in the table in the
> create table query, and by enabling the hive-partition-key option, Sqoop
> blindly appends the "partitioned by" clause. Now if you specify one of
> columns in the table in the hive-partition-key, this will cause a syntax
> error in Hive.
> For example, if we have a table 'FOO' that has columns 'I' and 'J':
> sqoop create-hive-table --table FOO ...
> will generate the following Hive query:
> CREATE TABLE IF NOT EXISTS `FOO` ( `I` STRING, `J` STRING)
> Now if we add "--hive-partition-key I" to the command, Sqoop generates the
> following query:
> CREATE TABLE IF NOT EXISTS `FOO` ( `I` STRING, `J` STRING) PARTITIONED BY (I
> STRING)
> The problem is that since 'I' is defined twice (once in CRATE TABLE and once
> in PARTITIONED BY), this is a syntax error in Hive.
> This correct query would be something like:
> CREATE TABLE IF NOT EXISTS `FOO` (`J` STRING) PARTITIONED BY (I STRING)
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