[jira] [Assigned] (SPARK-31751) spark serde property path overwrites table property location

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-31751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-31751:
------------------------------------

    Assignee:     (was: Apache Spark)

> spark serde property path overwrites table property location
> ------------------------------------------------------------
>
>                 Key: SPARK-31751
>                 URL: https://issues.apache.org/jira/browse/SPARK-31751
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.1, 2.4.5
>            Reporter: Nithin
>            Priority: Major
>
> This is an issue that have caused us so many data errors. 
> 1) using spark ( with hive context enabled )
> {code}
> df = spark.createDataFrame([{"a": "x", "b": "y", "c": "3"}])
> df.write.format("orc").option("compression", "ZLIB").mode("overwrite").saveAsTable('test_spark');
> {code}
>  
> 2) from hive 
> {code}
> alter table test_spark rename to test_spark2
> {code}
>  
> 3)from spark-sql from command line ( note : not pyspark or spark-shell )  
> {code}
> select * from test_spark2
> {code}
>  
> will give output 
> {code}
> NULL NULL NULL
> Time taken: 0.334 seconds, Fetched 1 row(s)
> {code}
>  
> This will throw NULL because , pyspark write API will add a serde property called path into the hive metastore. when hive renames the table , it do not understand this serde and hence keep it as it is. Now when spark-sql tries to read it , it will honor the serde property first and then tries to read from the non-existent hdfs location. If it had given an error , then also it would have been fine , but throwing out NULL will cause applications to fail pretty bad. Spark claims to support hive tables , hence it should respect hive metastore location property rather than spark serde property when trying to read a table. This cannot be classified as a expected behaviour.



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