Class IndexFieldData.XFieldComparatorSource

    • Method Detail

      • sortMissingFirst

        public final boolean sortMissingFirst​(java.lang.Object missingValue)
        Whether missing values should be sorted first.
      • sortMissingLast

        public final boolean sortMissingLast​(java.lang.Object missingValue)
        Whether missing values should be sorted last, this is the default.
      • missingObject

        public final java.lang.Object missingObject​(java.lang.Object missingValue,
                                                    boolean reversed)
        Return the missing object value according to the reduced type of the comparator.
      • reducedType

        public abstract reducedType()
      • missingValue

        public java.lang.Object missingValue​(boolean reversed)
        Return a missing value that is understandable by SortField.setMissingValue(Object). Most implementations return null because they already replace the value at the fielddata level. However this can't work in case of strings since there is no such thing as a string which compares greater than any other string, so in that case we need to return SortField.STRING_FIRST or SortField.STRING_LAST so that the coordinating node knows how to deal with null values.