[jira] [Resolved] (SPARK-24226) while reading data from oracle 12c from spark and using the numofpartition more than 1 is not returning the exact count

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-24226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-24226.
----------------------------------
    Resolution: Incomplete

> while reading data from oracle 12c from spark and using the numofpartition more than 1 is not returning the exact count
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-24226
>                 URL: https://issues.apache.org/jira/browse/SPARK-24226
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.2.0
>            Reporter: Chandan
>            Priority: Major
>              Labels: bulk-closed
>
> Reading data from oracle using JDBC using spark sql context as below.
> val query = s"""(select col1,col2,rownum from schematic.tablename) A)"""
> val df = sparkcontextInstance.sqlcontext.read.("jdbc")
>  .option("url", urlstring)
>  .option("dbtable", query)
>  .option("user", username)
>  .option("password", password)
>  .option("numPartitions", 20)
>  .option("partitionColumn", "rownum")
>  .option("lowerBound", 1)
>  .option("upperBound", 3000000).option("fetchsize", 1500)
>  .load()
> df.count() is returning only 150000 i.e upper bound/numpartition
> The table has 3 million records
> The table does not have any numerical column so taken rownum as partition column
> The above code is returning the data frame count 



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