sunchao commented on code in PR #2608:
URL: https://github.com/apache/arrow-rs/pull/2608#discussion_r959969219
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arrow/src/compute/kernels/temporal.rs:
##########
@@ -28,33 +28,33 @@ use chrono::format::{parse, Parsed};
use chrono::FixedOffset;
macro_rules! extract_component_from_array {
- ($array:ident, $builder:ident, $extract_fn:ident, $using:ident) => {
+ ($array:ident, $builder:ident, $extract_fn:ident, $using:ident,
$convert:expr) => {
Review Comment:
why we need the `$convert`?
##########
arrow/src/compute/kernels/mod.rs:
##########
@@ -35,5 +35,6 @@ pub mod sort;
pub mod substring;
pub mod take;
pub mod temporal;
+// pub(crate) use temporal::extract_component_from_array;
Review Comment:
what is this for?
##########
arrow/src/compute/kernels/cast.rs:
##########
@@ -1482,25 +1487,35 @@ where
}
/// Cast timestamp types to Utf8/LargeUtf8
-fn cast_timestamp_to_string<T, OffsetSize>(array: &ArrayRef) ->
Result<ArrayRef>
+fn cast_timestamp_to_string<T, OffsetSize>(
+ array: &ArrayRef,
+ tz: &Option<String>,
+) -> Result<ArrayRef>
where
T: ArrowTemporalType + ArrowNumericType,
i64: From<<T as ArrowPrimitiveType>::Native>,
OffsetSize: OffsetSizeTrait,
{
let array = array.as_any().downcast_ref::<PrimitiveArray<T>>().unwrap();
- Ok(Arc::new(
- (0..array.len())
- .map(|ix| {
- if array.is_null(ix) {
- None
- } else {
- array.value_as_datetime(ix).map(|v| v.to_string())
- }
- })
- .collect::<GenericStringArray<OffsetSize>>(),
- ))
+ let mut builder = GenericStringBuilder::<OffsetSize>::new();
+
+ if let Some(tz) = tz {
+ let mut scratch = Parsed::new();
+ extract_component_from_array!(
Review Comment:
it's not too obvious to see what this is doing, maybe add some comments?
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