jayzhan211 commented on code in PR #8744:
URL: https://github.com/apache/arrow-datafusion/pull/8744#discussion_r1446966314
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datafusion/physical-expr/src/array_expressions.rs:
##########
@@ -2611,6 +2618,95 @@ pub fn array_distinct(args: &[ArrayRef]) ->
Result<ArrayRef> {
}
}
+/// array_resize SQL function
+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)
+ }
+ array_type => exec_err!("array_resize does not support type
'{array_type:?}'."),
+ }
+}
+
+/// array_resize keep the original array and append the default element to the
end
+fn general_list_resize<O: OffsetSizeTrait>(
+ array: &GenericListArray<O>,
+ count_array: &Int64Array,
+ field: &FieldRef,
+ default_element: Option<ArrayRef>,
+) -> Result<ArrayRef>
+where
+ O: TryInto<i64>,
+{
+ let mut default_element_array = vec![];
+
+ let data_type = array.value_type();
+ let default_element = if let Some(default_element) = default_element {
+ default_element
+ } else {
+ let null_scalar = ScalarValue::try_from(&data_type)?;
+ null_scalar.to_array_of_size(1)?
Review Comment:
Should this be `to_array_of_size(row_len)`?
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