`cast_decimal_to_int16_down` formats decimal value incorrectly

[manuzhang]

Describe the bug

When implementing fix: array to array cast, the test of casting ArrayType(DecimalType(10,2)) to ArrayType(ShortType) failed with following error, where comet formats -96833550.07 to -96833550.7DB.

"...The value -96833550.[]7BD of the type "DEC..." did not equal "...The value -96833550.[0]7BD of the type "DEC..." (CometCastSuite.scala:1328)

It looks to be related to cast_decimal_to_int16_down

datafusion-comet/native/spark-expr/src/conversion_funcs/cast.rs

Lines 674 to 696 in 5ec12d4

	macro_rules! cast_decimal_to_int16_down {
	(
	$array:expr,
	$eval_mode:expr,
	$dest_array_type:ty,
	$rust_dest_type:ty,
	$dest_type_str:expr,
	$precision:expr,
	$scale:expr
	) => {{
	let cast_array = $array
	.as_any()
	.downcast_ref::<Decimal128Array>()
	.expect("Expected a Decimal128ArrayType");
	let output_array = match $eval_mode {
	EvalMode::Ansi => cast_array
	.iter()
	.map(|value| match value {
	Some(value) => {
	let divisor = 10_i128.pow($scale as u32);
	let (truncated, decimal) = (value / divisor, (value % divisor).abs());
	let is_overflow = truncated.abs() > i32::MAX.into();

It can be proven by printing the original and truncated values.

casting value: -9683355007, truncated: -96833550, decimal: 7, is_overflow: false

Steps to reproduce

No response

Expected behavior

No response

Additional context

No response