Package org.apache.parquet.format

Enum ColumnOrder._Fields

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description
      TYPE__ORDER
      The sort orders for logical types are: UTF8 - unsigned byte-wise comparison INT8 - signed comparison INT16 - signed comparison INT32 - signed comparison INT64 - signed comparison UINT8 - unsigned comparison UINT16 - unsigned comparison UINT32 - unsigned comparison UINT64 - unsigned comparison DECIMAL - signed comparison of the represented value DATE - signed comparison FLOAT16 - signed comparison of the represented value (*) TIME_MILLIS - signed comparison TIME_MICROS - signed comparison TIMESTAMP_MILLIS - signed comparison TIMESTAMP_MICROS - signed comparison INTERVAL - undefined JSON - unsigned byte-wise comparison BSON - unsigned byte-wise comparison ENUM - unsigned byte-wise comparison LIST - undefined MAP - undefined VARIANT - undefined GEOMETRY - undefined GEOGRAPHY - undefined In the absence of logical types, the sort order is determined by the physical type: BOOLEAN - false, true INT32 - signed comparison INT64 - signed comparison INT96 (only used for legacy timestamps) - undefined(+) FLOAT - signed comparison of the represented value (*) DOUBLE - signed comparison of the represented value (*) BYTE_ARRAY - unsigned byte-wise comparison FIXED_LEN_BYTE_ARRAY - unsigned byte-wise comparison (+) While the INT96 type has been deprecated, at the time of writing it is still used in many legacy systems.

    • Enum Constant Detail

      • TYPE__ORDER

        public static final ColumnOrder._Fields TYPE__ORDER
        The sort orders for logical types are: UTF8 - unsigned byte-wise comparison INT8 - signed comparison INT16 - signed comparison INT32 - signed comparison INT64 - signed comparison UINT8 - unsigned comparison UINT16 - unsigned comparison UINT32 - unsigned comparison UINT64 - unsigned comparison DECIMAL - signed comparison of the represented value DATE - signed comparison FLOAT16 - signed comparison of the represented value (*) TIME_MILLIS - signed comparison TIME_MICROS - signed comparison TIMESTAMP_MILLIS - signed comparison TIMESTAMP_MICROS - signed comparison INTERVAL - undefined JSON - unsigned byte-wise comparison BSON - unsigned byte-wise comparison ENUM - unsigned byte-wise comparison LIST - undefined MAP - undefined VARIANT - undefined GEOMETRY - undefined GEOGRAPHY - undefined In the absence of logical types, the sort order is determined by the physical type: BOOLEAN - false, true INT32 - signed comparison INT64 - signed comparison INT96 (only used for legacy timestamps) - undefined(+) FLOAT - signed comparison of the represented value (*) DOUBLE - signed comparison of the represented value (*) BYTE_ARRAY - unsigned byte-wise comparison FIXED_LEN_BYTE_ARRAY - unsigned byte-wise comparison (+) While the INT96 type has been deprecated, at the time of writing it is still used in many legacy systems. If a Parquet implementation chooses to write statistics for INT96 columns, it is recommended to order them according to the legacy rules: - compare the last 4 bytes (days) as a little-endian 32-bit signed integer - if equal last 4 bytes, compare the first 8 bytes as a little-endian 64-bit signed integer (nanos) See https://github.com/apache/parquet-format/issues/502 for more details (*) Because the sorting order is not specified properly for floating point values (relations vs. total ordering) the following compatibility rules should be applied when reading statistics: - If the min is a NaN, it should be ignored. - If the max is a NaN, it should be ignored. - If the min is +0, the row group may contain -0 values as well. - If the max is -0, the row group may contain +0 values as well. - When looking for NaN values, min and max should be ignored. When writing statistics the following rules should be followed: - NaNs should not be written to min or max statistics fields. - If the computed max value is zero (whether negative or positive), `+0.0` should be written into the max statistics field. - If the computed min value is zero (whether negative or positive), `-0.0` should be written into the min statistics field.

    • Method Detail

      • values

        public static ColumnOrder._Fields[] values()
        Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows: 
        for (ColumnOrder._Fields c : ColumnOrder._Fields.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static ColumnOrder._Fields valueOf​(String name)
        Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
        Parameters:
        name - the name of the enum constant to be returned.
        Returns:
        the enum constant with the specified name
        Throws:
        IllegalArgumentException - if this enum type has no constant with the specified name
        NullPointerException - if the argument is null

      • findByThriftId

        public static ColumnOrder._Fields findByThriftId​(int fieldId)
        Find the _Fields constant that matches fieldId, or null if its not found.

      • findByThriftIdOrThrow

        public static ColumnOrder._Fields findByThriftIdOrThrow​(int fieldId)
        Find the _Fields constant that matches fieldId, throwing an exception if it is not found.

      • findByName

        public static ColumnOrder._Fields findByName​(String name)
        Find the _Fields constant that matches name, or null if its not found.

      • getThriftFieldId

        public short getThriftFieldId()
        Specified by:
        getThriftFieldId in interface org.apache.thrift.TFieldIdEnum

      • getFieldName

        public String getFieldName()
        Specified by:
        getFieldName in interface org.apache.thrift.TFieldIdEnum