Type Alias arrow::array::builder::GenericBinaryBuilder

pub type GenericBinaryBuilder<O> = GenericByteBuilder<GenericBinaryType<O>>;

Array builder for GenericBinaryArray

Values can be appended using GenericByteBuilder::append_value, and nulls with GenericByteBuilder::append_null.

Example

let mut builder = GenericBinaryBuilder::<i32>::new();

// Write data
builder.append_value("foo");

// Write second value
builder.append_value(&[0,1,2]);

let array = builder.finish();
// binary values
assert_eq!(array.value(0), b"foo");
assert_eq!(array.value(1), b"\x00\x01\x02");

Example incrementally writing bytes with write_bytes

let mut builder = GenericBinaryBuilder::<i32>::new();

// Write data in multiple `write_bytes` calls
write!(builder, "foo").unwrap();
write!(builder, "bar").unwrap();
// The next call to append_value finishes the current string
// including all previously written strings.
builder.append_value("baz");

// Write second value with a single write call
write!(builder, "v2").unwrap();
// finish the value by calling append_value with an empty string
builder.append_value("");

let array = builder.finish();
assert_eq!(array.value(0), "foobarbaz".as_bytes());
assert_eq!(array.value(1), "v2".as_bytes());

Aliased Type

struct GenericBinaryBuilder<O> { /* private fields */ }