[jira] [Created] (CALCITE-1555) Improve RelNode validation

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created CALCITE-1555:
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             Summary: Improve RelNode validation
                 Key: CALCITE-1555
                 URL: https://issues.apache.org/jira/browse/CALCITE-1555
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


Improve {{RelNode}} validation by:
* adding a context to the {{RelNode.isValid}} method;
* enabling the {{Join.isValid}} method (it was previously renamed to {{isValid_}}, thus disabled).

The context to {{isValid}} will allow the validator to deduce what correlation variables are available (namely, those set by a RelNode between this one and the root). The context is optional; if null, the {{isValid}} method does the best it can.

{{RexInputRef}}s in the condition of a null-generating side of an outer join currently may be nullable when they should not be; the row type in the namespace is currently made nullable when actually only particular uses of the namespace should be nullable. We introduce {{class ScopeChild}} to hold the ordinal, row type and nullability of a use of a namespace.



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