Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18958#discussion_r134114641
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/ColumnVector.java
---
@@ -281,62 +255,14 @@ public Object get(int ordinal, DataType dataType) {
/**
* Resets this column for writing. The currently stored values are no
longer accessible.
*/
- public void reset() {
- if (isConstant) return;
-
- if (childColumns != null) {
- for (ColumnVector c: childColumns) {
- c.reset();
- }
- }
- numNulls = 0;
- elementsAppended = 0;
- if (anyNullsSet) {
- putNotNulls(0, capacity);
- anyNullsSet = false;
- }
- }
+ public abstract void reset();
--- End diff --
if `ColumnVector` is read-only, why we need a `reset` API?
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