Stamatis>They're already supported by the SQL parser and the relational
algebra and
Stamatis>soon (<https://issues.apache.org/jira/browse/CALCITE-2404>) they
will be
Stamatis>supported also by the execution engine in the enumerable
convention.

Does it require struct type to be fully qualified upfront?

For instance, can it support tree-like structures like the following?

Node {
  Node left;
  Node right;
};

or something like

Node {
  Object left; // it can be Node or other type
  Object right;
};

Vladimir

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