Module arrow::util::string_writer

String Writer This string writer encapsulates std::string::String and implements std::io::Write trait, which makes String as a writable object like File.

Example:

#[cfg(feature = "csv")]
{
use arrow::array::*;
use arrow::csv;
use arrow::datatypes::*;
use arrow::record_batch::RecordBatch;
use arrow::util::string_writer::StringWriter;
use std::sync::Arc;

let schema = Schema::new(vec![
    Field::new("c1", DataType::Utf8, false),
    Field::new("c2", DataType::Float64, true),
    Field::new("c3", DataType::UInt32, false),
    Field::new("c3", DataType::Boolean, true),
]);
let c1 = StringArray::from(vec![
    "Lorem ipsum dolor sit amet",
    "consectetur adipiscing elit",
    "sed do eiusmod tempor",
]);
let c2 = PrimitiveArray::<Float64Type>::from(vec![
    Some(123.564532),
    None,
    Some(-556132.25),
]);
let c3 = PrimitiveArray::<UInt32Type>::from(vec![3, 2, 1]);
let c4 = BooleanArray::from(vec![Some(true), Some(false), None]);

let batch = RecordBatch::try_new(
    Arc::new(schema),
    vec![Arc::new(c1), Arc::new(c2), Arc::new(c3), Arc::new(c4)],
)
.unwrap();

let sw = StringWriter::new();
let mut writer = csv::Writer::new(sw);
writer.write(&batch).unwrap();
}

Structs

• StringWriter
  A writer that allows writing to a String like an std::io::Write object.