address comments

sql/core/src/main/java/org/apache/spark/sql/vectorized/ColumnVector.java

@@ -31,15 +31,15 @@
  *
  * ColumnVector supports all the data types including nested types. To handle nested types,
  * ColumnVector can have children and is a tree structure. For struct type, it stores the actual
- * data of each field in the corresponding child ColumnVector, and only store null information in
+ * data of each field in the corresponding child ColumnVector, and only stores null information in
  * the parent ColumnVector. For array type, it stores the actual array elements in the child
- * ColumnVector, and store null information, array offsets and lengths in the parent ColumnVector.
+ * ColumnVector, and stores null information, array offsets and lengths in the parent ColumnVector.
  *
  * ColumnVector is expected to be reused during the entire data loading process, to avoid allocating
  * memory again and again.
  *
- * ColumnVector is meant to maximize CPU efficiency but not to minimize storage footprint,
- * implementations should prefer computing efficiency over storage efficiency when design the
+ * ColumnVector is meant to maximize CPU efficiency but not to minimize storage footprint.
+ * Implementations should prefer computing efficiency over storage efficiency when design the
  * format. Since it is expected to reuse the ColumnVector instance while loading data, the storage
  * footprint is negligible.
  */

sql/core/src/main/java/org/apache/spark/sql/vectorized/ColumnarBatch.java

@@ -23,9 +23,9 @@
 import org.apache.spark.sql.types.StructType;
 
 /**
- * This class is a wrapper of multiple ColumnVectors and represents a logical table-like data
- * structure. It provides a row-view of this batch so that Spark can access the data row by row.
- * Instance of it is meant to be reused during the entire data loading process.
+ * This class wraps multiple ColumnVectors as a row-wise table. It provides a row view of this
+ * batch so that Spark can access the data row by row. Instance of it is meant to be reused during
+ * the entire data loading process.
  */
 public final class ColumnarBatch {
   public static final int DEFAULT_BATCH_SIZE = 4 * 1024;
@@ -79,7 +79,7 @@ public void remove() {
   }
 
   /**
-   * Sets the number of rows that are valid in this batch.
+   * Sets the number of rows in this batch.
    */
   public void setNumRows(int numRows) {
     assert(numRows <= this.capacity);