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https://issues.apache.org/jira/browse/SPARK-28368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16884971#comment-16884971
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Kideok Kim edited comment on SPARK-28368 at 7/15/19 9:23 AM:
-------------------------------------------------------------
Thank you for your comment.
I'm using boxed Integer because It is only way to get numeric primitives from
Row. We cannot use like this _Row.<int>getAs()_.
So, your comment is that, we always can get null values from null numeric
primitive types in java even if the getAs() api describes like this and this is
looks not an issue?
{code:java}
/**
* Returns the value of a given fieldName.
* For primitive types if value is null it returns 'zero value' specific for
primitive
* ie. 0 for Int - use isNullAt to ensure that value is not null
*
* @throws UnsupportedOperationException when schema is not defined.
* @throws IllegalArgumentException when fieldName do not exist.
* @throws ClassCastException when data type does not match.
*/
def getAs[T](fieldName: String): T = getAs[T](fieldIndex(fieldName))
{code}
was (Author: kideok):
Thank you for your comment.
I'm using boxed Integer because It is only way to get numeric primitives from
Row. We cannot use like this _Row.<int>getAs()_.
> Row.getAs() return different values in scala and java
> -----------------------------------------------------
>
> Key: SPARK-28368
> URL: https://issues.apache.org/jira/browse/SPARK-28368
> Project: Spark
> Issue Type: Bug
> Components: Java API
> Affects Versions: 2.4.3
> Reporter: Kideok Kim
> Priority: Major
>
> *description*
> * About
> [org.apache.spark.sql.Row.getAs()|https://spark.apache.org/docs/2.4.3/api/java/org/apache/spark/sql/Row.html#getAs-java.lang.String-],
> It doesn't return zero value in java even if I used primitive type null
> value. (scala return zero value.) Here is an example with spark ver 2.4.3.
> {code:java}
> @Test
> public void testIntegerTypeNull() {
> StructType schema =
> createStructType(Arrays.asList(createStructField("test", IntegerType, true)));
> Object[] values = new Object[1];
> values[0] = null;
> Row row = new GenericRowWithSchema(values, schema);
> Integer result = row.getAs("test");
> System.out.println(result); // result = null
> }{code}
> * This problem is shown by not only Integer type, but also all primitive
> types of java like double, long and so on. I really appreciate if you confirm
> whether it is a normal or not.
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