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https://issues.apache.org/jira/browse/DRILL-4497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281305#comment-15281305
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Ian Hellstrom commented on DRILL-4497:
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This behaviour is the same as in Java and is likely a consequence of it.
> Casting strings with leading/trailing spaces to integers does not work
> ----------------------------------------------------------------------
>
> Key: DRILL-4497
> URL: https://issues.apache.org/jira/browse/DRILL-4497
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.5.0
> Reporter: Ian Hellstrom
>
> When casting a string with leading and/or trailing spaces to an integer type
> (e.g. INT or BIGINT), an exception is thrown. Casting the same numbers to
> floating-point numbers works.
> This is inconsistent and extremely confusing. Simply using TRIM() before
> casting works though.
> {code}
> SELECT CAST(' 1' AS INT) FROM ...
> SELECT CAST('1 ' AS INT) FROM ...
> {code}
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