code: public static boolean supportsDefaultValueComputed(String columnType, String defaultValue) {
          HashSet<String> possibleComputedValues = SUPPORTED_DEFAULT_VALUE_COMPUTED_MAP.get(columnType);
          return (possibleComputedValues != null) && possibleComputedValues.contains(defaultValue.toLowerCase());
      }
docs: Checks to see if the string is an acceptable computed value for HSQL
  "datetime" columns are the only columns for which HSQL supports computer values.
  
  @param columnType   String of the column's data type
  @param defaultValue String to be checked for valid valueComputed in HSQL
  @return boolean True if the string represents a function supported by HSQL for default values