alamb commented on code in PR #6936:
URL: https://github.com/apache/arrow-datafusion/pull/6936#discussion_r1280562577
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datafusion/physical-expr/src/array_expressions.rs:
##########
@@ -363,6 +363,177 @@ pub fn make_array(arrays: &[ArrayRef]) ->
Result<ArrayRef> {
}
}
+fn return_empty(return_null: bool, data_type: DataType) -> Arc<dyn Array> {
+ if return_null {
+ new_null_array(&data_type, 1)
+ } else {
+ new_empty_array(&data_type)
+ }
+}
+
+macro_rules! list_slice {
+ ($ARRAY:expr, $I:expr, $J:expr, $RETURN_ELEMENT:expr, $ARRAY_TYPE:ident)
=> {{
+ let array = $ARRAY.as_any().downcast_ref::<$ARRAY_TYPE>().unwrap();
+ if $I == 0 && $J == 0 || $ARRAY.is_empty() {
+ return return_empty($RETURN_ELEMENT, $ARRAY.data_type().clone());
+ }
+
+ let i = if $I < 0 {
+ if $I.abs() as usize > array.len() {
+ return return_empty(true, $ARRAY.data_type().clone());
+ }
+
+ (array.len() as i64 + $I + 1) as usize
+ } else {
+ if $I == 0 {
+ 1
+ } else {
+ $I as usize
+ }
+ };
+ let j = if $J < 0 {
+ if $J.abs() as usize > array.len() {
+ return return_empty(true, $ARRAY.data_type().clone());
+ }
+
+ if $RETURN_ELEMENT {
+ (array.len() as i64 + $J + 1) as usize
+ } else {
+ (array.len() as i64 + $J) as usize
+ }
+ } else {
+ if $J == 0 {
+ 1
+ } else {
+ if $J as usize > array.len() {
+ array.len()
+ } else {
+ $J as usize
+ }
+ }
+ };
+
+ if i > j || i as usize > $ARRAY.len() {
+ return_empty($RETURN_ELEMENT, $ARRAY.data_type().clone())
+ } else {
+ Arc::new(array.slice((i - 1), (j + 1 - i)))
+ }
+ }};
+}
+
+macro_rules! slice {
Review Comment:
> I don't quite comprehend your comment. If I use take kernel with
ListArray, the program returns me the elements of ListArray (i. e. Array
instances). So if it's really worth it can you give me more information how
should I take data?
I was thinking we call `take()` with the values array (like
`take(list_array.values(), indices`)
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