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https://issues.apache.org/jira/browse/SPARK-25723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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huanghuai reopened SPARK-25723:
-------------------------------
reproduce
> spark sql External DataSource question
> --------------------------------------
>
> Key: SPARK-25723
> URL: https://issues.apache.org/jira/browse/SPARK-25723
> Project: Spark
> Issue Type: Question
> Components: SQL
> Affects Versions: 2.3.2
> Environment: local mode
> Reporter: huanghuai
> Priority: Major
> Attachments: QQ图片20181015182502.jpg
>
>
> trait PrunedFilteredScan {
> def buildScan(requiredColumns: Array[String], filters: Array[Filter]):
> RDD[Row]
> }
>
> if i implement this trait, i find requiredColumns param is different
> everytime,Why are the order different????
> you can use spark.read.jdbc and connect to your local mysql DB, and debug at
> org.apache.spark.sql.execution.datasources.jdbc.JDBCRelation#buildScan(scala:130)
> to show this param;
> attachement is my screenshot
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