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https://issues.apache.org/jira/browse/HIVE-3604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14485688#comment-14485688
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Alexander Pivovarov commented on HIVE-3604:
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Added "If cast(exp as boolean) hive returns true for non-empty string." to
LanguageManual UDF
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-TypeConversionFunctions
> Casting strings to booleans gives unexpected result
> ---------------------------------------------------
>
> Key: HIVE-3604
> URL: https://issues.apache.org/jira/browse/HIVE-3604
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 0.8.1
> Environment: Amazon EMR
> Reporter: Ariel M
>
> I would expect the following query to return false in both columns:
> select 'false', cast('false' as boolean) from example_table limit 1;
> but here are the actual results:
> Total MapReduce CPU Time Spent: X seconds X msec
> OK
> false true
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