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https://issues.apache.org/jira/browse/FLINK-4242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395477#comment-15395477
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ASF GitHub Bot commented on FLINK-4242:
---------------------------------------
Github user gallenvara commented on the issue:
https://github.com/apache/flink/pull/2290
Will update later to include the issue of
[flink-4241](https://issues.apache.org/jira/browse/FLINK-4241) .
> Improve validation exception messages
> -------------------------------------
>
> Key: FLINK-4242
> URL: https://issues.apache.org/jira/browse/FLINK-4242
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.1.0
> Reporter: Till Rohrmann
> Priority: Minor
>
> The Table API's validation exceptions could be improved to be more meaningful
> for users. For example, the following code snippet:
> {code}
> Table inputTable = tableEnv.fromDataStream(env.fromElements(
> Tuple3.of(1, "a", 1.0),
> Tuple3.of(2, "b", 2.0),
> Tuple3.of(3, "c", 3.0)), "a, b, c");
> inputTable.select("a").where("!a");
> {code}
> fails correctly. However, the validation exception message says "Expression
> !('a) failed on input check: Not only accepts child of Boolean Type, get
> Integer". I think it could be changed such that it says: "The not operator
> requires a boolean input but "a" is of type integer." or something similar.
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