Enum ColumnBuilder 

pub(crate) enum ColumnBuilder {
    Str(StringBuilder),
    Int16(Int16Builder),
    Int32(Int32Builder),
    Float32(Float32Builder),
    Float64(Float64Builder),
    Date32(Date32Builder),
    TimestampSecond(TimestampSecondBuilder),
    TimestampMillisecond(TimestampMillisecondBuilder),
    TimestampMicrosecond(TimestampMicrosecondBuilder),
    TimestampNanosecond(TimestampNanosecondBuilder),
    Time32Second(Time32SecondBuilder),
    Time64Microsecond(Time64MicrosecondBuilder),
}

A typed Arrow array builder for a single column.

Each variant wraps the corresponding Arrow builder, pre-sized with capacity hints from the metadata (row count, string storage_width). Values are appended directly during FFI callbacks, eliminating intermediate allocations.

Variants

Str(StringBuilder)

UTF-8 string column.

Int16(Int16Builder)

16-bit signed integer column (covers both SAS Int8 and Int16).

Int32(Int32Builder)

32-bit signed integer column.

Float32(Float32Builder)

32-bit floating point column.

Float64(Float64Builder)

64-bit floating point column.

Date32(Date32Builder)

Date column (days since Unix epoch).

TimestampSecond(TimestampSecondBuilder)

Timestamp with second precision.

TimestampMillisecond(TimestampMillisecondBuilder)

Timestamp with millisecond precision.

TimestampMicrosecond(TimestampMicrosecondBuilder)

Timestamp with microsecond precision.

TimestampNanosecond(TimestampNanosecondBuilder)

Timestamp with nanosecond precision.

Time32Second(Time32SecondBuilder)

Time of day with second precision.

Time64Microsecond(Time64MicrosecondBuilder)

Time of day with microsecond precision.

Implementations

impl ColumnBuilder

pub(crate) fn as_string_mut(&mut self) -> &mut StringBuilder

Returns a mutable reference to the inner [StringBuilder].

Panics

Panics if self is not ColumnBuilder::Str.

pub(crate) fn append_null(&mut self)

Appends a null value, regardless of the underlying builder type.

pub(crate) fn finish(&mut self) -> ArrayRef

Finishes the builder and returns the completed Arrow array.

fn from_metadata(vm: &ReadStatVarMetadata, capacity: usize) -> Self

Creates a typed builder matching the variable’s metadata.

Uses var_type, var_type_class, and var_format_class to select the correct builder variant, and pre-sizes it with capacity rows. For string columns, storage_width provides a byte-level capacity hint.