Chris McConnell created SQOOP-527:
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Summary: Improve process for collecting metadata from database
during job creation
Key: SQOOP-527
URL: https://issues.apache.org/jira/browse/SQOOP-527
Project: Sqoop
Issue Type: Improvement
Components: connectors
Reporter: Chris McConnell
Priority: Minor
When executing an import, under certain situations Sqoop will execute metadata
look-up queries twice through the org.apache.sqoop.manager.SQLManager class.
For example, imports from Teradata through a specified JDBC driver
(com.teradata.jdbc.TeraDriver) will execute the user SQL twice, appending
"(1=0)." Query sample: SELECT col1, col2 FROM table WHERE col1> x AND (1=0)
This is only done at job setup time, not during the MR import.
Determine if the logic flow can be changed to only make this call once,
updating the required data objects. While impact on the exporting DB should be
minimal, it is not guaranteed.
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