Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20455#discussion_r165324640
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/execution/vectorized/ColumnarBatchSuite.scala
 ---
    @@ -1261,4 +1269,38 @@ class ColumnarBatchSuite extends SparkFunSuite {
         batch.close()
         allocator.close()
       }
    +
    +  testVector("getDecimal should return null for null slot", 4, 
DecimalType.IntDecimal) {
    --- End diff --
    
    shall we make it a normal test case for decimal type? we can follow the 
other tests, e.g. create a decimal array, and check the value of column vector 
at the same index.


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