code: public static final FilterOperation mapFilterHintToOperation(FilterOperationHint hint) {
          for(int i = 0; i < FILTER_OPERATIONS.length; i++) {
              FilterOperation op = FILTER_OPERATIONS[i];
              if(op.getOperationHint().equals(hint))
                  return op;
          }
          return null;
      }
docs: Map a {@link FilterOperationHint} to a SQL-specific {@link FilterOperation}.  When using SQL as a query
  language, all of the operations defined in {@link FilterOperationHint} should be supported.
  
  @param hint the hint
  @return the {@link FilterOperation} matching the given hint.