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https://issues.apache.org/jira/browse/FLINK-2118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15595011#comment-15595011
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Alexander Shoshin commented on FLINK-2118:
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I agree with [~RenkaiGe].
{{'name \!== "Pete" && 'name \!== "Bob"}} expression will not work correctly
without brackets because scala marks {{\!==}} as assignment operator which has
the lowest compare to other operators precedence.
At the moment scala hasn't an opportunity to set the infix operations
presedence manualy. The only way is to change {{\!==}} to something like {{<>}}
or {{=\!=}} as written in previous comment but it might become not so
intuitive. Moreover that will change the public API which is not a good idea.
Shouldn't we close this issue?
> Table API fails on composite filter conditions
> ----------------------------------------------
>
> Key: FLINK-2118
> URL: https://issues.apache.org/jira/browse/FLINK-2118
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 0.9
> Reporter: Fabian Hueske
> Assignee: Alexander Shoshin
>
> Having a composite filter conditions such as
> {code}
> myTable.filter('name !== "Pete" && 'name !== "Bob")
> {code}
> fails with the following error message:
> {code}
> ExpressionException: Non-boolean operand types String and String in Pete &&
> 'name
> {code}
> whereas
> {code}
> myTable.filter( ('name !== "Pete") && ('name !== "Bob") )
> {code}
> works.
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