Struct ColumnMeta 

pub struct ColumnMeta {
    pub name: String,
    pub offset: u64,
    pub length: u64,
    pub codec: ColumnCodec,
    pub block_count: u32,
    pub block_stats: Vec<BlockStats>,
    pub dictionary: Option<Vec<String>>,
}

Metadata for a single column within the segment footer.

Fields

name: String

Column name (matches schema definition).

offset: u64

Byte offset of this column’s first block from the start of the segment (after the header).

length: u64

Total byte length of all blocks for this column.

codec: ColumnCodec

Codec used for this column’s blocks.

block_count: u32

Number of blocks for this column.

block_stats: Vec<BlockStats>

Per-block statistics (one entry per block).

dictionary: Option<Vec<String>>

Dictionary for dict-encoded columns (None for non-dict columns).

Strings are stored in ID order: dictionary[0] is ID 0, etc. The actual column data is stored as i64 IDs via DeltaFastLanesLz4.

Trait Implementations

impl Clone for ColumnMeta

fn clone(&self) -> ColumnMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnMeta

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ColumnMeta

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'__msgpack_de> FromMessagePack<'__msgpack_de> for ColumnMeta

fn read<R: Read<'__msgpack_de>>(reader: &mut R) -> Result<Self, Error>

where Self: Sized,

Reads the MessagePack representation of this value from the provided reader.

impl Serialize for ColumnMeta

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl ToMessagePack for ColumnMeta

fn write<W: Write>(&self, writer: &mut W) -> Result<(), Error>

Writes the MessagePack representation of this value into the provided writer.