Method decode

arrow-json/src/reader/string_array.rs:50–138

(&mut self, tape: &Tape<'_>, pos: &[u32])

impl<O: OffsetSizeTrait> ArrayDecoder for StringArrayDecoder<O> {
    fn decode(&mut self, tape: &Tape<'_>, pos: &[u32]) -> Result<ArrayRef, ArrowError> {
        let coerce_primitive = self.coerce_primitive;

        let mut data_capacity = 0;
        for p in pos {
            match tape.get(*p) {
                TapeElement::String(idx) => {
                    data_capacity += tape.get_string(idx).len();
                }
                TapeElement::Null => {}
                TapeElement::True if coerce_primitive => {
                    data_capacity += TRUE.len();
                }
                TapeElement::False if coerce_primitive => {
                    data_capacity += FALSE.len();
                }
                TapeElement::Number(idx) if coerce_primitive => {
                    data_capacity += tape.get_string(idx).len();
                }
                TapeElement::I64(_)
                | TapeElement::I32(_)
                | TapeElement::F64(_)
                | TapeElement::F32(_)
                    if coerce_primitive =>
                {
                    // An arbitrary estimate
                    data_capacity += 10;
                }
                _ if self.ignore_type_conflicts => {}
                _ => {
                    return Err(tape.error(*p, "string"));
                }
            }
        }

        if O::from_usize(data_capacity).is_none() {
            return Err(ArrowError::JsonError(format!(
                "offset overflow decoding {}",
                GenericStringArray::<O>::DATA_TYPE
            )));
        }

        let mut builder = GenericStringBuilder::<O>::with_capacity(pos.len(), data_capacity);

        let mut float_formatter = ryu::Buffer::new();
        let mut int_formatter = itoa::Buffer::new();

        for p in pos {
            match tape.get(*p) {
                TapeElement::String(idx) => {
                    builder.append_value(tape.get_string(idx));
                }
                TapeElement::Null => builder.append_null(),
                TapeElement::True if coerce_primitive => {
                    builder.append_value(TRUE);
                }
                TapeElement::False if coerce_primitive => {
                    builder.append_value(FALSE);