viirya commented on code in PR #2247:
URL: https://github.com/apache/arrow-rs/pull/2247#discussion_r934041351
##########
arrow/src/array/array_decimal.rs:
##########
@@ -384,6 +391,59 @@ impl<'a> Decimal128Array {
}
}
+impl From<BigInt> for Decimal256 {
+ fn from(bigint: BigInt) -> Self {
+ Decimal256::from_big_int(&bigint, DECIMAL256_MAX_PRECISION,
DECIMAL_DEFAULT_SCALE)
+ .unwrap()
+ }
+}
+
+fn build_decimal_array_from<U: BasicDecimalArray<T, U>, T>(
+ null_buf: BooleanBufferBuilder,
+ buffer: Buffer,
+) -> U
+where
+ T: BasicDecimal,
+ U: From<ArrayData>,
+{
+ let data = unsafe {
+ ArrayData::new_unchecked(
+ U::default_type(),
+ null_buf.len(),
+ None,
+ Some(null_buf.into()),
+ 0,
+ vec![buffer],
+ vec![],
+ )
+ };
+ U::from(data)
+}
+
+impl<Ptr: Into<Decimal256>> FromIterator<Option<Ptr>> for Decimal256Array {
+ fn from_iter<I: IntoIterator<Item = Option<Ptr>>>(iter: I) -> Self {
+ let iter = iter.into_iter();
+ let (lower, upper) = iter.size_hint();
+ let size_hint = upper.unwrap_or(lower);
+
+ let mut null_buf = BooleanBufferBuilder::new(size_hint);
+
+ let mut buffer = MutableBuffer::from_len_zeroed(0);
Review Comment:
Changed to `with_capacity`.
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