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https://issues.apache.org/jira/browse/FLINK-19956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226468#comment-17226468
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Jark Wu commented on FLINK-19956:
---------------------------------

{{table.filter($("column") === true)}} should also work once you import 
{{import org.apache.flink.table.api._}}. The parameter can also be a variable: 


{code:java}
val column = "f0"
table.filter($(column) === true)
{code}


> $ does not work on variables without being qualified in Scala
> -------------------------------------------------------------
>
>                 Key: FLINK-19956
>                 URL: https://issues.apache.org/jira/browse/FLINK-19956
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / API
>    Affects Versions: 1.11.2
>         Environment: MacOS
>            Reporter: Rex Remind
>            Priority: Minor
>
> This does not compile:
> {code:java}
> val columnName = "bool_column"
> table.filter($(column) === true)  {code}
>  
> {color:#333333}This does:{color}
> {code:java}
> val columnName = "bool_column"
> table.filter(Expressions.$(column) === true)    {code}
>  
> {color:#333333}There's nothing obviously documented to using the later.{color}



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