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GaoLun commented on FLINK-4242:
-------------------------------
Yes, currently some messages of table exception aren't readable and clear for the users.
I will open a PR for this issue.
> 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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