Struct StatisticsMetadata

pub struct StatisticsMetadata {
    pub schema: Vec<Field>,
    pub fields: Vec<i32>,
    pub page_table_position: u64,
}

Fields

schema: Vec<Field>

The schema of the statistics.

This might be empty, meaning there are no statistics. It also might not contain statistics for every field.

fields: Vec<i32>

The field ids of the statistics leaf fields.

This plays a similar role to the fields field in the DataFile message. Each of these field ids corresponds to a field in the stats_schema. There is one per column in the stats page table.

page_table_position: u64

The file position of the statistics page table

The page table is a matrix of N x 2, where N = length of stats_fields. This is the same layout as the main page table, except there is always only one batch.

For example, to get the stats column 5, we have:

   position = stats_page_table[5][0];
   length = stats_page_table[5][1];

Trait Implementations

impl Clone for StatisticsMetadata

fn clone(&self) -> StatisticsMetadata

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StatisticsMetadata

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StatisticsMetadata

fn default() -> Self

Returns the “default value” for a type.

impl Message for StatisticsMetadata

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for StatisticsMetadata

fn eq(&self, other: &StatisticsMetadata) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for StatisticsMetadata