Struct ColumnBlockMeta 

pub struct ColumnBlockMeta {
    pub column_index: u16,
    pub encoding: EncodingType,
    pub compressed: bool,
    pub offset: u64,
    pub length: u32,
    pub value_count: u32,
    pub block_crc: u32,
    pub encrypted: bool,
    pub validity_offset: u64,
    pub validity_length: u32,
    pub stats: ColumnStats,
}

Per-row-group column block location and metadata.

Fields

column_index: u16

Index of the column in the column metadata table.

encoding: EncodingType

Encoding type for this specific block.

compressed: bool

Whether the block is LZ4-compressed.

offset: u64

Byte offset within the segment file.

length: u32

Length of the (possibly compressed) block in bytes.

value_count: u32

Number of values in this block.

block_crc: u32

CRC32c checksum of the block data for integrity verification. A value of 0 indicates no checksum (backward compatibility with old segments).

encrypted: bool

Whether this block is encrypted (AES-256-GCM).

validity_offset: u64

Byte offset of this block’s validity bitmap within the segment file.

See validity_length. Meaningless when validity_length == 0.

validity_length: u32

Length in bytes of this block’s validity bitmap, or 0 when the block contains no nulls (.csx v2, D-NULL).

The bitmap is an Arrow-compatible LSB-first packed bitmap of value_count bits: bit i set means row i holds a real value, bit clear means SQL NULL. It is stored uncompressed and unencrypted immediately after the block’s value bytes.

Before v2, absent values were encoded as type-specific sentinels (0/""/false) and only an aggregate null_count survived, so a stored zero and an absent field were indistinguishable at read time.

stats: ColumnStats

Block-level statistics.

Implementations

impl ColumnBlockMeta

pub const SIZE: usize

Serialized size of a column block metadata entry.

pub fn to_bytes(&self) -> Vec<u8>

Serialize to bytes.

pub fn from_bytes(data: &[u8]) -> Result<Self>

Deserialize from bytes.

Errors

Returns an error if the data is too short or contains invalid values.

Trait Implementations

impl Clone for ColumnBlockMeta

fn clone(&self) -> ColumnBlockMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnBlockMeta

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

Formats the value using the given formatter.

impl PartialEq for ColumnBlockMeta

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ColumnBlockMeta