int96_to_nanos
def int96_to_nanos(src: Span[UInt8]) -> Int64INT96: 8 little-endian bytes of nanoseconds within the day, then a little-endian Julian day number.
parquet.convert
Physical Parquet values to Arrow buffers.
A Parquet leaf's physical type and its Arrow type are often different widths:
an INT32 annotated Int(8, true) is one byte in Arrow, a DECIMAL over
FIXED_LEN_BYTE_ARRAY(7) is a sign-extended little-endian 16-byte integer, and
INT96 is a nanosecond timestamp built from a Julian day and a time of day.
append_value and append_null do that translation one value at a time,
straight into the destination ArrayData's buffers.
Functions
append_null
def append_null(mut out: ArrayData, leaf: LeafColumn)Append a null slot, keeping every buffer the right length.
Validity is the caller's business — parquet.assemble maintains it, and
only materialises a bitmap once a null actually turns up.
append_value
def append_value(mut out: ArrayData, leaf: LeafColumn, vals: PhysBuffer, vi: Int)Append value vi of vals, translated to out's Arrow type.
Aliases
comptime JULIAN_UNIX_EPOCH = 2440588comptime NANOS_PER_DAY = 86400000000000