[
https://issues.apache.org/jira/browse/SQOOP-3124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826337#comment-15826337
]
Szabolcs Vasas commented on SQOOP-3124:
---------------------------------------
Hi [~maugli],
Thank you for reviewing and committing this patch!
Exactly, without this patch the fields could be positioned in the map reduce
file differently than the table logics and that could be a problem for some
users.
Szabolcs
> Fix ordering in column list query of PostgreSQL connector
> ---------------------------------------------------------
>
> Key: SQOOP-3124
> URL: https://issues.apache.org/jira/browse/SQOOP-3124
> Project: Sqoop
> Issue Type: Bug
> Affects Versions: 1.4.6
> Reporter: Szabolcs Vasas
> Assignee: Szabolcs Vasas
> Fix For: 1.4.7
>
> Attachments: SQOOP-3124.patch
>
>
> PostgreSQL connector gets the lit of column names from pg_attribute system
> catalog table using the following query:
> {code}
> SELECT col.ATTNAME FROM PG_CATALOG.PG_NAMESPACE sch, PG_CATALOG.PG_CLASS
> tab, PG_CATALOG.PG_ATTRIBUTE col
> WHERE sch.OID = tab.RELNAMESPACE AND tab.OID = col.ATTRELID AND
> sch.NSPNAME = (SELECT CURRENT_SCHEMA()) AND tab.RELNAME = ? AND col.ATTNUM
> >= 1 AND col.ATTISDROPPED = 'f'
> {code}
> This SELECT statement does not contain an ORDER BY clause so the order of the
> result set is not guaranteed to be the column order defined during table
> creation and this can cause issues for the users.
> The task is to make sure that the result set of this query is sorted by the
> attnum column of the pg_attribute table
> (https://wiki.postgresql.org/wiki/Alter_column_position).
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
