Struct StringBuilderWrapper 

pub struct StringBuilderWrapper { /* private fields */ }

Builder for Arrow Utf8 arrays (VARCHAR, NVARCHAR).

Implementations

impl StringBuilderWrapper

pub fn new(capacity: usize, data_capacity: usize) -> Self

Create a new string builder.

Arguments

• capacity - Number of strings to pre-allocate
• data_capacity - Bytes to pre-allocate for string data

pub fn with_capacity(item_capacity: usize, data_capacity: usize) -> Self

Create builder with custom capacity for values and data.

pub fn default_capacity() -> Self

Create with default capacities (1024 items, 32KB data).

Trait Implementations

impl Debug for StringBuilderWrapper

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

Formats the value using the given formatter.

impl HanaCompatibleBuilder for StringBuilderWrapper

fn append_hana_value(&mut self, value: &HdbValue<'_>) -> Result<()>

Append a HANA value to this builder.

fn append_null(&mut self)

Append a null value to this builder.

fn finish(&mut self) -> ArrayRef

Finish building and return the Arrow array.

fn len(&self) -> usize

Returns the number of values (including nulls) appended so far.

fn capacity(&self) -> Option<usize>

Returns the capacity hint for this builder, if known.

fn reset(&mut self)

Reset the builder, clearing all data while preserving capacity.

fn is_empty(&self) -> bool

Returns true if no values have been appended.