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Posted to issues@spark.apache.org by "Jinhua Fu (JIRA)" <ji...@apache.org> on 2018/10/12 09:40:00 UTC
[jira] [Created] (SPARK-25717) Insert overwrite a recreated
external and partitioned table may result in incorrect query results
Jinhua Fu created SPARK-25717:
---------------------------------
Summary: Insert overwrite a recreated external and partitioned table may result in incorrect query results
Key: SPARK-25717
URL: https://issues.apache.org/jira/browse/SPARK-25717
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.3.2
Reporter: Jinhua Fu
Consider the following scenario:
{code:java}
spark.range(100).createTempView("temp")
(0 until 3).foreach { _ =>
spark.sql("drop table if exists tableA")
spark.sql("create table if not exists tableA(a int) partitioned by (p int) location 'file:/e:/study/warehouse/tableA'")
spark.sql("insert overwrite table tableA partition(p=1) select * from temp")
spark.sql("select count(1) from tableA where p=1").show
}
{code}
We expect the count always be 100, but the actual results are as follows:
{code:java}
+--------+
|count(1)|
+--------+
| 100|
+--------+
+--------+
|count(1)|
+--------+
| 200|
+--------+
+--------+
|count(1)|
+--------+
| 300|
+--------+
{code}
when spark executes an `insert overwrite` command, it gets the historical partition first, and then delete it from fileSystem.
But for recreated external and partitioned table, the partitions were all deleted by the `drop table` command. So the historical data is preserved which lead to the query results incorrect.
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