code: package it.unibz.inf.ontop.model.term.functionsymbol.db.impl;
  
  import com.google.common.collect.ImmutableList;
  import it.unibz.inf.ontop.exception.MinorOntopInternalBugException;
  import it.unibz.inf.ontop.iq.node.VariableNullability;
  import it.unibz.inf.ontop.model.term.DBConstant;
  import it.unibz.inf.ontop.model.term.ImmutableExpression;
  import it.unibz.inf.ontop.model.term.ImmutableTerm;
  import it.unibz.inf.ontop.model.term.TermFactory;
  import it.unibz.inf.ontop.model.term.functionsymbol.InequalityLabel;
  import it.unibz.inf.ontop.model.type.DBTermType;
  
  import java.math.BigDecimal;
  
  public class DefaultDBNumericInequalityOperator extends AbstractDBInequalityOperator {
  
      /**
       * TODO: type the input
       */
      protected DefaultDBNumericInequalityOperator(InequalityLabel inequalityLabel,
                                                   DBTermType rootDBTermType, DBTermType dbBoolean) {
          super(inequalityLabel, "NUM_" + inequalityLabel.name(), rootDBTermType, dbBoolean);
      }
  
      @Override
      public boolean canBePostProcessed(ImmutableList<? extends ImmutableTerm> arguments) {
          return true;
      }
  
      @Override
      protected ImmutableTerm buildTermAfterEvaluation(ImmutableList<ImmutableTerm> newTerms, TermFactory termFactory,
                                                       VariableNullability variableNullability) {
          if (newTerms.stream()
                  .allMatch(t -> t instanceof DBConstant)) {
              BigDecimal n1 = new BigDecimal(((DBConstant) newTerms.get(0)).getValue());
              BigDecimal n2 = new BigDecimal(((DBConstant) newTerms.get(1)).getValue());
  
              int comparison = n1.compareTo(n2);
              switch (inequalityLabel) {
                  case LT:
                      return termFactory.getDBBooleanConstant(comparison < 0);
                  case LTE:
                      return termFactory.getDBBooleanConstant(comparison <= 0);
                  case GT:
                      return termFactory.getDBBooleanConstant(comparison > 0);
                  case GTE:
                      return termFactory.getDBBooleanConstant(comparison >= 0);
                  default:
                      throw new MinorOntopInternalBugException("Unexpected inequalityLabel:" + inequalityLabel);
              }
          }
          return super.buildTermAfterEvaluation(newTerms, termFactory, variableNullability);
      }
  
      @Override
      protected ImmutableExpression buildInequality(InequalityLabel inequalityLabel,
                                                    ImmutableList<? extends ImmutableTerm> subTerms,
                                                    TermFactory termFactory) {
          return termFactory.getDBNumericInequality(inequalityLabel, subTerms.get(0), subTerms.get(1));
      }
  }
  