Flow PHP

DataPageHeaderV2

New page format allowing reading levels without decompressing the data Repetition and definition levels are uncompressed The remaining section containing the data is compressed if is_compressed is true.

Properties

$_TSPEC : mixed
$definition_levels_byte_length : int: Length of the definition levels.
$encoding : int: Encoding used for data in this page *.
$is_compressed : bool: Whether the values are compressed.
$isValidate : mixed
$num_nulls : int: Number of NULL values, in this data page.
$num_rows : int: Number of rows in this data page. Every page must begin at a row boundary (repetition_level = 0): rows must **not** be split across page boundaries when using V2 data pages.
$num_values : int: Number of values, including NULLs, in this data page. *.
$repetition_levels_byte_length : int: Length of the repetition levels.
$statistics : Statistics: Optional statistics for the data in this page *.

Methods

__construct() : mixed
getName() : mixed
read() : mixed
write() : mixed

$_TSPEC


    public
    static    mixed
    $_TSPEC
     = [1 => ['var' => 'num_values', 'isRequired' => true, 'type' => \Thrift\Type\TType::I32], 2 => ['var' => 'num_nulls', 'isRequired' => true, 'type' => \Thrift\Type\TType::I32], 3 => ['var' => 'num_rows', 'isRequired' => true, 'type' => \Thrift\Type\TType::I32], 4 => ['var' => 'encoding', 'isRequired' => true, 'type' => \Thrift\Type\TType::I32, 'class' => '\Flow\Parquet\Thrift\Encoding'], 5 => ['var' => 'definition_levels_byte_length', 'isRequired' => true, 'type' => \Thrift\Type\TType::I32], 6 => ['var' => 'repetition_levels_byte_length', 'isRequired' => true, 'type' => \Thrift\Type\TType::I32], 7 => ['var' => 'is_compressed', 'isRequired' => false, 'type' => \Thrift\Type\TType::BOOL], 8 => ['var' => 'statistics', 'isRequired' => false, 'type' => \Thrift\Type\TType::STRUCT, 'class' => '\Flow\Parquet\Thrift\Statistics']]

$definition_levels_byte_length

Length of the definition levels.


    public
        int
    $definition_levels_byte_length

$encoding

Encoding used for data in this page *.


    public
        int
    $encoding

$is_compressed

Whether the values are compressed.


    public
        bool
    $is_compressed
     = true

Which means the section of the page between definition_levels_byte_length + repetition_levels_byte_length + 1 and compressed_page_size (included) is compressed with the compression_codec. If missing it is considered compressed.

$isValidate


    public
    static    mixed
    $isValidate
     = false

$num_nulls

Number of NULL values, in this data page.


    public
        int
    $num_nulls

Number of non-null = num_values - num_nulls which is also the number of values in the data section *.

$num_rows

Number of rows in this data page. Every page must begin at a row boundary (repetition_level = 0): rows must **not** be split across page boundaries when using V2 data pages.


    public
        int
    $num_rows

$num_values

Number of values, including NULLs, in this data page. *.


    public
        int
    $num_values

$repetition_levels_byte_length

Length of the repetition levels.


    public
        int
    $repetition_levels_byte_length

$statistics

Optional statistics for the data in this page *.


    public
        Statistics
    $statistics

__construct()


    public
                    __construct([mixed $vals = null ]) : mixed

Parameters

$vals : mixed = null

getName()


    public
                    getName() : mixed

read()


    public
                    read(mixed $input) : mixed

Parameters

$input : mixed

write()


    public
                    write(mixed $output) : mixed

Parameters

$output : mixed