jayzhan211 commented on code in PR #8744:
URL: https://github.com/apache/arrow-datafusion/pull/8744#discussion_r1442519085
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datafusion/physical-expr/src/array_expressions.rs:
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@@ -2560,6 +2562,101 @@ pub fn array_distinct(args: &[ArrayRef]) ->
Result<ArrayRef> {
}
}
+pub fn array_resize(arg: &[ArrayRef]) -> Result<ArrayRef> {
+ if arg.len() < 2 || arg.len() > 3 {
+ return exec_err!("array_resize needs two or three arguments");
+ }
+
+ let new_len = as_int64_array(&arg[1])?;
+ let new_element = if arg.len() == 3 {
+ Some(arg[2].clone())
+ } else {
+ None
+ };
+
+ match &arg[0].data_type() {
+ DataType::List(field) => {
+ let array = as_list_array(&arg[0])?;
+ general_list_resize::<i32>(array, new_len, field, new_element)
+ }
+ DataType::LargeList(field) => {
+ let array = as_large_list_array(&arg[0])?;
+ general_list_resize::<i64>(array, new_len, field, new_element)
+ }
+ _ => exec_err!("array_resize only support list array"),
+ }
+}
+
+fn general_list_resize<O: OffsetSizeTrait>(
+ array: &GenericListArray<O>,
+ count_array: &Int64Array,
+ field: &FieldRef,
+ default_element: Option<ArrayRef>,
+) -> Result<ArrayRef> {
+ let mut offsets = vec![O::usize_as(0)];
+ let mut new_arrays = vec![];
+
+ let dt = array.value_type();
+ let converter = RowConverter::new(vec![SortField::new(dt.clone())])?;
+ let default_element = if let Some(default_element) = default_element {
+ default_element
+ } else {
+ empty_list(&dt)?
+ };
+ let rows = converter.convert_columns(&[default_element.clone()])?;
+
+ for (index, arr) in array.iter().enumerate() {
+ let count = count_array.value(index).to_usize().ok_or_else(|| {
+ exec_datafusion_err!("array_resize: failed to convert size to
usize")
+ })?;
+ let row = if rows.size() > 0 {
Review Comment:
maybe also rename row to `default_value`?
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