Package org.apache.parquet.format

Enum PageHeader._Fields

java.lang.Object
java.lang.Enum<PageHeader._Fields>
org.apache.parquet.format.PageHeader._Fields
All Implemented Interfaces:
Serializable, Comparable<PageHeader._Fields>, org.apache.thrift.TFieldIdEnum
Enclosing class:
PageHeader
public static enum PageHeader._Fields extends Enum<PageHeader._Fields> implements org.apache.thrift.TFieldIdEnum
The set of fields this struct contains, along with convenience methods for finding and manipulating them.

  • Enum Constant Details

    • TYPE

      public static final PageHeader._Fields TYPE
      the type of the page: indicates which of the *_header fields is set *
      See Also:

    • UNCOMPRESSED_PAGE_SIZE

      public static final PageHeader._Fields UNCOMPRESSED_PAGE_SIZE
      Uncompressed page size in bytes (not including this header) *

    • COMPRESSED_PAGE_SIZE

      public static final PageHeader._Fields COMPRESSED_PAGE_SIZE
      Compressed (and potentially encrypted) page size in bytes, not including this header *

    • CRC

      public static final PageHeader._Fields CRC
      The 32-bit CRC checksum for the page, to be calculated as follows: - The standard CRC32 algorithm is used (with polynomial 0x04C11DB7, the same as in e.g. GZIP). - All page types can have a CRC (v1 and v2 data pages, dictionary pages, etc.). - The CRC is computed on the serialization binary representation of the page (as written to disk), excluding the page header. For example, for v1 data pages, the CRC is computed on the concatenation of repetition levels, definition levels and column values (optionally compressed, optionally encrypted). - The CRC computation therefore takes place after any compression and encryption steps, if any. If enabled, this allows for disabling checksumming in HDFS if only a few pages need to be read.

    • DATA_PAGE_HEADER

      public static final PageHeader._Fields DATA_PAGE_HEADER

    • INDEX_PAGE_HEADER

      public static final PageHeader._Fields INDEX_PAGE_HEADER

    • DICTIONARY_PAGE_HEADER

      public static final PageHeader._Fields DICTIONARY_PAGE_HEADER

    • DATA_PAGE_HEADER_V2

      public static final PageHeader._Fields DATA_PAGE_HEADER_V2

  • Method Details

    • values

      public static PageHeader._Fields[] values()
      Returns an array containing the constants of this enum type, in the order they are declared.
      Returns:
      an array containing the constants of this enum type, in the order they are declared

    • valueOf

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

    • findByThriftIdOrThrow

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

    • findByName

      public static PageHeader._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