[jira] [Created] (SPARK-19887) __HIVE_DEFAULT_PARTITION__ not interpreted as NULL partition value in partitioned persisted tables

["Cheng Lian (JIRA)" <ji...@apache.org>]

Cheng Lian created SPARK-19887:
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             Summary: __HIVE_DEFAULT_PARTITION__ 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
            Reporter: Cheng Lian


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 table uses 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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