mz_arrow_util::builder

Struct ArrowBuilder

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pub struct ArrowBuilder {
    columns: Vec<ArrowColumn>,
    row_size_bytes: usize,
}

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§columns: Vec<ArrowColumn>§row_size_bytes: usize

A crude estimate of the size of the data in the builder based on the size of the rows added to it.

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impl ArrowBuilder

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pub fn validate_desc(desc: &RelationDesc) -> Result<(), Error>

Helper to validate that a RelationDesc can be encoded into Arrow.

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pub fn new( desc: &RelationDesc, item_capacity: usize, data_capacity: usize, ) -> Result<Self, Error>

Initializes a new ArrowBuilder with the schema of the provided RelationDesc. item_capacity is used to initialize the capacity of each column’s builder which defines the number of values that can be appended to each column before reallocating. data_capacity is used to initialize the buffer size of the string and binary builders. Errors if the relation contains an unimplemented type.

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pub fn schema(&self) -> Schema

Returns a copy of the schema of the ArrowBuilder.

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pub fn to_record_batch(self) -> Result<RecordBatch, ArrowError>

Converts the ArrowBuilder into an arrow RecordBatch.

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pub fn add_row(&mut self, row: &Row) -> Result<(), Error>

Appends a row to the builder. Errors if the row contains an unimplemented or out-of-range value.

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pub fn row_size_bytes(&self) -> usize

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