Struct HlxHeader 

pub struct HlxHeader {
    pub fields: Vec<HlxField>,
    pub metadata: HashMap<String, Value>,
    pub flags: u8,
    pub row_count: u64,
    pub preview_rows: Option<Vec<Value>>,
}

Helix Data File (.helix) Header Structure This is for binary DATA output files, not configuration files. For configuration files, see hlx_config_format.rs (.hlx) and hlxb_config_format.rs (.hlxb)

Fields

fields: Vec<HlxField>

Schema fields (simplified representation)

metadata: HashMap<String, Value>

Optional metadata about the run

flags: u8

Compression flags

row_count: u64

Number of rows in this file

preview_rows: Option<Vec<Value>>

Optional preview rows (first N rows as JSONL)

Implementations

impl HlxHeader

pub fn new(schema: &Schema, metadata: HashMap<String, Value>) -> Self

pub fn with_compression(self, compressed: bool) -> Self

Set compression flag

pub fn with_row_count(self, count: u64) -> Self

Set row count

pub fn with_preview(self, preview: Vec<Value>) -> Self

Set preview rows (first N rows as JSON)

pub fn is_compressed(&self) -> bool

Check if compression is enabled

pub fn to_json_bytes(&self) -> Result<Vec<u8>, HlxError>

Serialize header to JSON bytes

pub fn from_json_bytes(bytes: &[u8]) -> Result<Self, HlxError>

Deserialize header from JSON bytes

Trait Implementations

impl Clone for HlxHeader

fn clone(&self) -> HlxHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HlxHeader

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for HlxHeader

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for HlxHeader

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

where __S: Serializer,

Serialize this value into the given Serde serializer.