zhangxffff commented on code in PR #8268:
URL: https://github.com/apache/arrow-datafusion/pull/8268#discussion_r1409001429
##########
datafusion/physical-expr/src/array_expressions.rs:
##########
@@ -1991,6 +1992,71 @@ pub fn array_intersect(args: &[ArrayRef]) ->
Result<ArrayRef> {
}
}
+pub fn general_array_distinct<OffsetSize: OffsetSizeTrait>(
+ array: &GenericListArray<OffsetSize>,
+ field: &FieldRef,
+) -> Result<ArrayRef> {
+ let dt = array.value_type();
+ let mut offsets = vec![OffsetSize::usize_as(0)];
+ let mut new_arrays = vec![];
+ let converter = RowConverter::new(vec![SortField::new(dt.clone())])?;
+ // distinct for each list in ListArray
+ for arr in array.iter().flatten() {
+ let values = converter.convert_columns(&[arr])?;
+ let mut rows = Vec::with_capacity(values.num_rows());
+ // sort elements in list and remove duplicates
+ for val in values.iter().sorted().dedup() {
+ rows.push(val);
+ }
Review Comment:
It seems that using `collect::<Vec<_>>()` can avoid waste memory in vector
##########
datafusion/physical-expr/src/array_expressions.rs:
##########
@@ -1991,6 +1992,71 @@ pub fn array_intersect(args: &[ArrayRef]) ->
Result<ArrayRef> {
}
}
+pub fn general_array_distinct<OffsetSize: OffsetSizeTrait>(
+ array: &GenericListArray<OffsetSize>,
+ field: &FieldRef,
+) -> Result<ArrayRef> {
+ let dt = array.value_type();
+ let mut offsets = vec![OffsetSize::usize_as(0)];
+ let mut new_arrays = vec![];
+ let converter = RowConverter::new(vec![SortField::new(dt.clone())])?;
+ // distinct for each list in ListArray
+ for arr in array.iter().flatten() {
+ let values = converter.convert_columns(&[arr])?;
Review Comment:
why not distinct array in columnar way, `arr` has only one column, using row
format need extra encoding and decoding
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