Struct SegmentWriter 

pub struct SegmentWriter { /* private fields */ }

Writes a drained memtable into a complete segment byte buffer.

The segment is self-contained: header identifies the format, column blocks store compressed data, and the footer enables random access to any column without scanning the entire file.

Implementations

impl SegmentWriter

pub fn new(profile_tag: u8) -> Self

Create a writer for the given profile without a memory governor.

pub fn with_governor(profile_tag: u8, governor: Arc<MemoryGovernor>) -> Self

Create a writer for the given profile with a memory governor.

pub fn plain() -> Self

Create a writer for the plain (default) profile.

pub fn write_segment( &self, schema: &ColumnarSchema, columns: &[ColumnData], row_count: usize, kek: Option<&WalEncryptionKey>, ) -> Result<Vec<u8>, ColumnarError>

Encode a drained memtable into a segment byte buffer.

schema is the column schema, columns are the drained column data, row_count is the total number of rows.

When kek is Some, the assembled plaintext segment is wrapped in an AES-256-GCM encrypted SEGC envelope before being returned. When None, the raw NDBS segment bytes are returned.