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https://issues.apache.org/jira/browse/FLINK-19956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226298#comment-17226298
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Rex Remind commented on FLINK-19956:
------------------------------------
Your example does not look like string interpolation to me, {{$"column" ===
true}} looks like a string literal columnar access.
However, when I try string interpolation, it provides exactly the same error:
{code:java}
$(s"$column") === true
not found: value ${code}
Also, to be clear my example is a toy example, in practice column is a string
variable that is a function of concatenating many other things. It is not
static and cannot be replaced by a literal.
> $ 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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