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From "Marco Gaido (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-17280) Data loss in CONCATENATE ORC created by Spark
Date Wed, 09 Aug 2017 13:26:00 GMT
Marco Gaido created HIVE-17280:
----------------------------------

             Summary: Data loss in CONCATENATE ORC created by Spark
                 Key: HIVE-17280
                 URL: https://issues.apache.org/jira/browse/HIVE-17280
             Project: Hive
          Issue Type: Bug
          Components: Hive, Spark
    Affects Versions: 1.2.1
         Environment: Tested in HDP-2.6
            Reporter: Marco Gaido


Hive concatenation causes data loss if the ORC files in the table were written by Spark.

Here are the steps to reproduce the problem:
 - create a table;
{code:java}
hive
hive> create table aa (a string, b int) stored as orc;
{code}
 - insert 2 rows using Spark;
{code:java}
spark-shell
scala> case class AA(a:String, b:Int)
scala> val df = sc.parallelize(Array(AA("b",2),AA("c",3) )).toDF
scala> df.write.insertInto("aa")
{code}
 - change table schema;
{code:java}
hive
hive> alter table aa add columns(aa string, bb int);
{code}
 - insert other 2 rows with Spark
{code:java}
spark-shell
scala> case class BB(a:String, b:Int, aa:String, bb:Int)
scala> val df = sc.parallelize(Array(BB("b",2,"b",2),BB("c",3,"c",3) )).toDF
scala> df.write.insertInto("aa")
{code}
 - at this point, running a select statement with Hive returns correctly 4 rows in the table;
then run the concatenation
{code:java}
hive
hive> alter table aa concatenate;
{code}
At this point, a select returns only* 3 rows, ie. a row is missing*.




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