Vladan Vasić created SPARK-50894:
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Summary: Upgrade postgresql driver to properly connect to Redshift
Key: SPARK-50894
URL: https://issues.apache.org/jira/browse/SPARK-50894
Project: Spark
Issue Type: Bug
Components: Build, Spark Core
Affects Versions: 4.0.0
Reporter: Vladan Vasić
In this [PR|https://github.com/apache/spark/pull/47810] the version of
`postgresql` driver was upgraded to `42.7.4`. However, this caused one major
regression:
{{Postgres}} driver was not compatible for connection to the {{Redshift}} Data
Source. This happened because the {{42.7.4}} driver version unnecessarily sent
{{SET extra_float_digits = 3}} queries to the destination data source when
establishing the connection. However, the upper limit for
{{extra_float_digits}} parameter in Redshift is 2.
The driver version should be upgraded, because this behavior of sending
unnecessary queries which set the {{extra_float_digits}} when establishing
connection is fixed in the
[42.7.5|https://github.com/pgjdbc/pgjdbc/releases/tag/REL42.7.5] driver version.
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