[jira] [Created] (FLINK-5547) Move checks for DataSetRel validity into constructor

["Fabian Hueske (JIRA)" <ji...@apache.org>]

Fabian Hueske created FLINK-5547:
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             Summary: Move checks for DataSetRel validity into constructor
                 Key: FLINK-5547
                 URL: https://issues.apache.org/jira/browse/FLINK-5547
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
    Affects Versions: 1.2.0, 1.3.0
            Reporter: Fabian Hueske
            Priority: Minor


At the moment, most check to verify that a {{DataSetRel}} is valid are done in the {{translateToPlan()}} method. These checks are for instance validating that a {{DataSetJoin}} has at least one equality predicate.

Usually, the optimization process (i.e., the translation rules) should take care that no plans with invalid operators can be constructed. However, we should have these validity checks as an additional safety net which catch invalid plans if optimization rules are added or modified.

These checks should be done in the constructor to ensure that invalid operators are identified and not overlooked because this plan alternative was more expensive than a valid one. 

This issue is to check all {{DataSetRel}} nodes and move their validity checks into the constructor.



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