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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/03/13 16:16:41 UTC
[jira] [Assigned] (SPARK-19887) __HIVE_DEFAULT_PARTITION__ is not
interpreted as NULL partition value in partitioned persisted tables
[ https://issues.apache.org/jira/browse/SPARK-19887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-19887:
------------------------------------
Assignee: (was: Apache Spark)
> __HIVE_DEFAULT_PARTITION__ is not interpreted as NULL partition value in partitioned persisted tables
> -----------------------------------------------------------------------------------------------------
>
> Key: SPARK-19887
> URL: https://issues.apache.org/jira/browse/SPARK-19887
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0, 2.2.0
> Reporter: Cheng Lian
> Labels: correctness
>
> The following Spark shell snippet under Spark 2.1 reproduces this issue:
> {code}
> val data = Seq(
> ("p1", 1, 1),
> ("p2", 2, 2),
> (null, 3, 3)
> )
> // Correct case: Saving partitioned data to file system.
> val path = "/tmp/partitioned"
> data.
> toDF("a", "b", "c").
> write.
> mode("overwrite").
> partitionBy("a", "b").
> parquet(path)
> spark.read.parquet(path).filter($"a".isNotNull).show(truncate = false)
> // +---+---+---+
> // |c |a |b |
> // +---+---+---+
> // |2 |p2 |2 |
> // |1 |p1 |1 |
> // +---+---+---+
> // Incorrect case: Saving partitioned data as persisted table.
> data.
> toDF("a", "b", "c").
> write.
> mode("overwrite").
> partitionBy("a", "b").
> saveAsTable("test_null")
> spark.table("test_null").filter($"a".isNotNull).show(truncate = false)
> // +---+--------------------------+---+
> // |c |a |b |
> // +---+--------------------------+---+
> // |3 |__HIVE_DEFAULT_PARTITION__|3 | <-- This line should not be here
> // |1 |p1 |1 |
> // |2 |p2 |2 |
> // +---+--------------------------+---+
> {code}
> Hive-style partitioned tables use the magic string {{\_\_HIVE_DEFAULT_PARTITION\_\_}} to indicate {{NULL}} partition values in partition directory names. However, in the case persisted partitioned table, this magic string is not interpreted as {{NULL}} but a regular string.
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