Github user jiangxb1987 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20316#discussion_r162518569
  
    --- Diff: 
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedParquetRecordReader.java
 ---
    @@ -50,6 +50,9 @@
      * TODO: make this always return ColumnarBatches.
      */
     public class VectorizedParquetRecordReader extends 
SpecificParquetRecordReaderBase<Object> {
    +  // TODO: make this configurable.
    +  private static final int CAPACITY = 4 * 1024;
    --- End diff --
    
    Then, what should we use for capacity in `ColumnVectorUtils.toBatch()` ?


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