StringArrayBuilder

datafusion::functions::strings

Struct StringArrayBuilder 

Source 
pub struct StringArrayBuilder {
    offsets_buffer: MutableBuffer,
    value_buffer: MutableBuffer,
}
Expand description

Optimized version of the StringBuilder in Arrow that:

  1. Precalculating the expected length of the result, avoiding reallocations.
  2. Avoids creating / incrementally creating a NullBufferBuilder

Fields§

§offsets_buffer: MutableBuffer§value_buffer: MutableBuffer

Implementations§

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impl StringArrayBuilder

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

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pub fn write<const CHECK_VALID: bool>( &mut self, column: &ColumnarValueRef<'_>, i: usize, )

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pub fn append_offset(&mut self)

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pub fn finish( self, null_buffer: Option<NullBuffer>, ) -> GenericByteArray<GenericStringType<i32>>

Finalize the builder into a concrete StringArray.

§Panics

This method can panic when:

  • the provided null_buffer is not the same length as the offsets_buffer.

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