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https://issues.apache.org/jira/browse/SPARK-28097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867004#comment-16867004
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Apache Spark commented on SPARK-28097:
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User 'mojodna' has created a pull request for this issue:
https://github.com/apache/spark/pull/24845
> Map ByteType to SMALLINT when using JDBC with PostgreSQL
> --------------------------------------------------------
>
> Key: SPARK-28097
> URL: https://issues.apache.org/jira/browse/SPARK-28097
> Project: Spark
> Issue Type: Improvement
> Components: Input/Output
> Affects Versions: 2.3.3, 2.4.3
> Reporter: Seth Fitzsimmons
> Priority: Minor
>
> PostgreSQL doesn't have {{TINYINT}}, which would map directly, but
> {{SMALLINT}}s are sufficient for uni-directional translation (i.e. when
> writing).
> This is equivalent to a user selecting {{'byteColumn.cast(ShortType)}}.
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