Yaohua628 commented on a change in pull request #35068:
URL: https://github.com/apache/spark/pull/35068#discussion_r778614421
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File path:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/ConstantColumnVector.java
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@@ -0,0 +1,212 @@
+package org.apache.spark.sql.execution.vectorized;
+
+import org.apache.spark.sql.types.DataType;
+import org.apache.spark.sql.types.Decimal;
+import org.apache.spark.sql.vectorized.ColumnVector;
+import org.apache.spark.sql.vectorized.ColumnarArray;
+import org.apache.spark.sql.vectorized.ColumnarMap;
+import org.apache.spark.unsafe.types.UTF8String;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
+/**
+ * This class adds the constant support to ColumnVector.
+ * It supports all the types and contains put APIs,
+ * which will put the exact same value to all rows.
+ *
+ * Capacity: The vector only stores one copy of the data, and acts as an
unbounded vector
+ * (get from any row will return the same value)
+ */
+public class ConstantColumnVector extends ColumnVector {
Review comment:
I was thinking to extend `WritableColumnVector` initially, but seems
like we needs to implement some unnecessary public methods like:
`putLongs(rowId, count, value)`
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