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https://issues.apache.org/jira/browse/FLINK-19956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17225805#comment-17225805
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Jark Wu commented on FLINK-19956:
---------------------------------
Did you have the following imports in your program?
{code:scala}
import org.apache.flink.api.scala._
import org.apache.flink.table.api._
{code}
This has been mentioned in documentation:
https://ci.apache.org/projects/flink/flink-docs-release-1.11/dev/table/tableApi.html#overview--examples.
> $ 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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