Code example for LoadingCache

Methods: getUnchecked

    assert getTraitClass().isInstance(trait)
        : getClass().getName()
        + " cannot canonize a " 
        + trait.getClass().getName();
    return canonicalMap.getUnchecked(trait);
   * Converts the given RelNode to the given RelTrait. 
   * @param planner                     the planner requesting the conversion 
   * @param rel                         RelNode to convert 
   * @param toTrait                     RelTrait to convert to 
   * @param allowInfiniteCostConverters flag indicating whether infinite cost 
   *                                    converters are allowed 
   * @return a converted RelNode or null if conversion is not possible 
  public abstract RelNode convert( 
      RelOptPlanner planner,
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