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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