https://github.com/vmzakharov/dataframe-ec: A tabular data structure based on the Eclipse Collections framework
  • Vladimir Zakharov 
package io.github.vmzakharov.ecdataframe.dsl;

import io.github.vmzakharov.ecdataframe.dsl.value.Value;

public interface BinaryOp
{
    Value apply(Value operand1, Value operand2);
    String asString();
}