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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2019/03/01 23:19:00 UTC
[jira] [Resolved] (SPARK-26407) For an external non-partitioned
table, if add a directory named with k=v to the table path, select result
will be wrong
[ https://issues.apache.org/jira/browse/SPARK-26407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved SPARK-26407.
-------------------------------
Resolution: Not A Problem
I don't think it's reasonable to add arbitrary other dirs under this directory.
> For an external non-partitioned table, if add a directory named with k=v to the table path, select result will be wrong
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-26407
> URL: https://issues.apache.org/jira/browse/SPARK-26407
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Bao Yunz
> Priority: Major
> Labels: usability
>
> Scenario 1
> Create an external non-partitioned table, in which location directory has a directory named with "part=1" and its schema is (id, name), for example. And there is some data in the "part=1" directory. Then desc the table, we will find the "part" is added in table schema as table column. when insert into the table with two columns data, will throw a exception that target table has 3 columns but the inserted data has 2 columns.
> Scenario 2
> Create an external non-partitioned table, which location path is empty and its scema is (id, name), for example. After several times insert operation, we add a directory named with "part=1" in the table location directory. And there is some data in the "part=1" directory. Then do insert and select operation, we will find the scan path is changed to "tablePath/part=1"，so that we will get a wrong result.
> The right logic should be that if a table is a non-partitioned table, adding a partition-like folder under tablePath should not change its schema and select result.
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