[jira] [Created] (FLINK-3622) Improve error messages for invalid joins

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-3622:
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             Summary: Improve error messages for invalid joins
                 Key: FLINK-3622
                 URL: https://issues.apache.org/jira/browse/FLINK-3622
             Project: Flink
          Issue Type: Bug
          Components: Table API
    Affects Versions: 1.1.0
            Reporter: Fabian Hueske


Invalid Table API joins do not show descriptive error messages:
- Joins without a equality join condition
- Joins with non-matching equality join predicates



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