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Create a well-defined, cross-language specification for data compute operations

There is a newer version: 0.46.1

package io.substrait.isthmus;

import io.substrait.expression.Expression;
import java.util.Optional;
import java.util.function.Function;
import org.apache.calcite.rex.RexCall;
import org.apache.calcite.rex.RexNode;

@FunctionalInterface
public interface CallConverter {
  Optional convert(RexCall call, Function topLevelConverter);
}