HappenLee commented on code in PR #43939:
URL: https://github.com/apache/doris/pull/43939#discussion_r1844918438
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be/src/vec/columns/column.h:
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@@ -503,13 +503,17 @@ class IColumn : public COW<IColumn> {
/** Split column to smaller columns. Each value goes to column index,
selected by corresponding element of 'selector'.
* Selector must contain values from 0 to num_columns - 1.
- * For default implementation, see scatter_impl.
+ * For default implementation, see column_impl.h
*/
using ColumnIndex = UInt64;
using Selector = PaddedPODArray<ColumnIndex>;
+ // The append_data_by_selector function requires the column to implement
the insert_from function.
+ // In fact, this function is just calling insert_from but without the
overhead of a virtual function.
+
Review Comment:
remove the useless space line
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