Struct MutableEventRow 

pub struct MutableEventRow<'a> { /* private fields */ }

Arena-allocated, mutable writer for constructing an EventRow.

The backing buffer is allocated from a [bumpalo::Bump] arena, ensuring zero heap allocations on the hot path.

Implementations

impl<'a> MutableEventRow<'a>

pub fn new_in( arena: &'a Bump, schema: &'a RowSchema, var_capacity: usize, ) -> Self

Allocates a new row from the given arena.

var_capacity is the number of extra bytes reserved for variable-length data (strings, binary). The total allocation is schema.min_row_size() + var_capacity.

pub fn set_null(&mut self, field_idx: usize, is_null: bool)

Sets or clears the null flag for a field.

When is_null is true, the field is marked as null in the bitmap.

pub fn set_bool(&mut self, field_idx: usize, value: bool)

Writes a bool field.

pub fn set_i8(&mut self, field_idx: usize, value: i8)

Writes an i8 field.

pub fn set_i16(&mut self, field_idx: usize, value: i16)

Writes an i16 field.

pub fn set_i32(&mut self, field_idx: usize, value: i32)

Writes an i32 field.

pub fn set_i64(&mut self, field_idx: usize, value: i64)

Writes an i64 field. Also accepts FieldType::TimestampMicros.

pub fn set_u8(&mut self, field_idx: usize, value: u8)

Writes a u8 field.

pub fn set_u16(&mut self, field_idx: usize, value: u16)

Writes a u16 field.

pub fn set_u32(&mut self, field_idx: usize, value: u32)

Writes a u32 field.

pub fn set_u64(&mut self, field_idx: usize, value: u64)

Writes a u64 field.

pub fn set_f32(&mut self, field_idx: usize, value: f32)

Writes an f32 field.

pub fn set_f64(&mut self, field_idx: usize, value: f64)

Writes an f64 field.

pub fn set_str(&mut self, field_idx: usize, value: &str)

Writes a variable-length UTF-8 string field.

Appends the string bytes to the variable region and writes the (offset, length) descriptor pair in the field’s inline slot.

Panics

Panics if the variable region overflows the allocated capacity.

pub fn set_bytes(&mut self, field_idx: usize, value: &[u8])

Writes a variable-length binary field.

Appends the bytes to the variable region and writes the (offset, length) descriptor pair in the field’s inline slot.

Panics

Panics if the variable region overflows the allocated capacity.

pub fn as_event_row(&self) -> EventRow<'_>

Borrows the current row state as a read-only EventRow.

The returned row’s lifetime is tied to the borrow of self.

pub fn freeze(self) -> EventRow<'a>

Consumes the mutable row, returning a read-only EventRow with the arena lifetime.

Trait Implementations

impl<'a> Debug for MutableEventRow<'a>

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

Formats the value using the given formatter.