feat(isthmus): support converting Substrait Plan.Root to Calcite RelRoot #339
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Signed-off-by: Niels Pardon <par@zurich.ibm.com>
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Isthmus currently only supports converting a Substrait
Relinto a CalciteRelNodelosing the final column names which are encoded in the SubstraitPlan.Rootand which should be converted into a CalciteRelRoot.This PR adds a
convert()method for converting a SubstraitPlan.Rootinto a CalciteRelRootpreserving the final column names.Currently, substrait-java does not support DML/DDL relations like
WriteRelso the conversion may have to be revisited once support for DML/DDL relations is being added.