Till Rohrmann created FLINK-4242:
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Summary: 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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