cloud-fan commented on code in PR #41782:
URL: https://github.com/apache/spark/pull/41782#discussion_r1297167489
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sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java:
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@@ -867,12 +880,28 @@ public final boolean isAllNull() {
*/
protected int capacity;
+ /**
+ * The default number of rows that can be stored in this column.
+ */
+ protected int defaultCapacity;
+
/**
* Upper limit for the maximum capacity for this column.
*/
@VisibleForTesting
protected int MAX_CAPACITY = ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH;
+ /**
+ * True if this column has default values. Return the default values instead
of NULL when the
+ * corresponding columns are not present in storage. We can not reset the
data of column vectors
+ * that has default values.
Review Comment:
I'm not convinced about it. We can reset it and set the default value again,
can't we?
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