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https://issues.apache.org/jira/browse/SPARK-28451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16890099#comment-16890099
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Hyukjin Kwon commented on SPARK-28451:
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Personally I don't think it'w worth but let's see what other committers like.
> substr returns different values
> -------------------------------
>
> Key: SPARK-28451
> URL: https://issues.apache.org/jira/browse/SPARK-28451
> Project: Spark
> Issue Type: Sub-task
> Components: Tests
> Affects Versions: 3.0.0
> Reporter: Yuming Wang
> Priority: Major
>
> PostgreSQL:
> {noformat}
> postgres=# select substr('1234567890', -1, 5);
> substr
> --------
> 123
> (1 row)
> postgres=# select substr('1234567890', 1, -1);
> ERROR: negative substring length not allowed
> {noformat}
> Spark SQL:
> {noformat}
> spark-sql> select substr('1234567890', -1, 5);
> 0
> spark-sql> select substr('1234567890', 1, -1);
> spark-sql>
> {noformat}
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