[IMPALA-5782] Issue with WITH clause with Cloudera JDBC Driver for Impala - Returning column name instead of actual Data

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Information Provided
• Affects Version/s: Impala 2.8.0
• Epic Color: ghx-label-5
• Assignee: Unassigned
• Reporter: Arghya Saha
• Created: 09/Aug/17 15:09
• Updated: 09/Aug/17 17:18
• Resolved: 09/Aug/17 15:50

Description

I am using Cloudera JDBC Driver for Impala v 2.5.38 with Spark 1.6.0 to create DataFrame. It is working fine for all queries except WITH clause, but WITH is extensively used in my organization. Below is my code snippet.

def jdbcHDFS(url:String,sql: String):DataFrame = {
  var rddDF: DataFrame = null
  val jdbcURL = s"jdbc:impala://$url"
  val connectionProperties = new java.util.Properties
  connectionProperties.setProperty("driver","com.cloudera.impala.jdbc41.Driver")
  rddDF = sqlContext.read.jdbc(jdbcURL, s"($sql) AS ST", connectionProperties)
  rddDF
}

Given below example for working and non-working SQL

val workingSQL = "select empname from (select * from employee) as tmp"
val nonWorkingSQL = "WITH tmp as (select * from employee) select empname from tmp"

Below is the output of rddDF.first for above SQLs.

For workingSQL

scala> rddDF.first
res8: org.apache.spark.sql.Row = [Kushal]

For nonWorkingSQL

scala> rddDF.first
res8: org.apache.spark.sql.Row = [empname] //Here we are expecting actual data ie. 'Kushal' instead of column name like the output of previous query.

It would be really helpful if anyone can suggest any solution for it.

Please note: Both the queries are working fine in IMPALA-SHELL as well as in HIVE through HUE.