cloud-fan commented on a change in pull request #24581: [SPARK-27675][SQL] do
not use MutableColumnarRow in ColumnarBatch
URL: https://github.com/apache/spark/pull/24581#discussion_r283194273
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/MutableColumnarRow.java
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@@ -39,17 +38,10 @@
*/
public final class MutableColumnarRow extends InternalRow {
public int rowId;
- private final ColumnVector[] columns;
- private final WritableColumnVector[] writableColumns;
-
- public MutableColumnarRow(ColumnVector[] columns) {
- this.columns = columns;
- this.writableColumns = null;
- }
+ private final WritableColumnVector[] columns;
Review comment:
I thought about it too. `MutableColumnarRow` is used in performance critical
path (hash aggregate), and I'm a little hesitant to add class Hierarchy here,
which may hurt performance. cc @kiszk
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