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From "Nan Zhu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-22680) SparkSQL scan all partitions when the specified partitions are not exists in parquet formatted table
Date Thu, 07 Dec 2017 18:04:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-22680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16282248#comment-16282248
] 

Nan Zhu commented on SPARK-22680:
---------------------------------

how you observed that spark scans all partitions? I tried to reproduce but no luck

table structure
{code}
zhunan@sparktest:~/testdata1$ ls
count1=1  count1=2  count1=3  _SUCCESS
{code}

query: select * from table1 where count1 = 4

I can see the log shows 

17/12/07 17:57:51 INFO PrunedInMemoryFileIndex: Selected 0 partitions out of 0, pruned 0 partitions.
17/12/07 17:57:51 TRACE PrunedInMemoryFileIndex: Selected files after partition pruning:

No file was selected


> SparkSQL scan all partitions when the specified partitions are not exists in parquet
formatted table
> ----------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-22680
>                 URL: https://issues.apache.org/jira/browse/SPARK-22680
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.2, 2.2.0
>         Environment: spark2.0.2 spark2.2.0
>            Reporter: Xiaochen Ouyang
>
> 1. spark-sql --master local[2]
> 2. create external table test (id int,name string) partitioned by (country string,province
string, day string,hour int) stored as parquet localtion '/warehouse/test';
> 3.produce data into table test
> 4. select count(1) from test where country = '185' and province = '021' and day = '2017-11-12'
and hour = 10; if the 4 filter conditions are not exists in HDFS and MetaStore[mysql] , this
sql will scan all partitions in table test



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