Arghya Saha created IMPALA-5782:
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Summary: Issue with WITH clause with Cloudera JDBC Driver for
Impala - Returning column name instead of actual Data
Key: IMPALA-5782
URL: https://issues.apache.org/jira/browse/IMPALA-5782
Project: IMPALA
Issue Type: Bug
Affects Versions: Impala 2.8.0
Reporter: Arghya Saha
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.
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