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https://issues.apache.org/jira/browse/FLINK-6632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017092#comment-16017092
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Fabian Hueske commented on FLINK-6632:
--------------------------------------

I think a better approach to solve this would be to add "true" and "false" as 
keywords to the parser. Keywords are parsed case-insensitive.
What do you think [~twalthr]?

> Fix parameter case sensitive error for test passing/rejecting filter API
> ------------------------------------------------------------------------
>
>                 Key: FLINK-6632
>                 URL: https://issues.apache.org/jira/browse/FLINK-6632
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>
> TableAPI {{testAllPassingFilter}}:
> {code} 
>    val t = util.addTable[(Int, Long, String)]('int, 'long, 'string)
>     val resScala = t.filter(Literal(true)).select('int as 'myInt, 'string)
>     val resJava = t.filter("TrUe").select("int as myInt, string")
> {code}
> We got error:
> {code}
> org.apache.flink.table.api.ValidationException: Cannot resolve [TrUe] given 
> input [int, long, string].
> {code}
> The error is caused by :
> {code}
>     lazy val boolLiteral: PackratParser[Expression] = ("true" | "false") ^^ {
>     str => Literal(str.toBoolean)
>   }
> {code}
> I want import the method as follow:
> {code}
>  lazy val boolLiteral: PackratParser[Expression] =
>     ("(t|T)(r|R)(u|U)(e|E)".r | "(f|F)(a|A)(l|L)(s|S)(e|E)".r) ^^ { str => 
> Literal(str.toBoolean)}
> {code}
> Is there any drawback to this improvement? Welcome anyone feedback ?



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