Unable to save dataframe on HDFS for Informix database

Question

We are able to connect Informix database with driver com.informix.jdbc.IfxDriver. However, we are unable to save the dataframe on HDFS for any table, but we are able to print schama for any table.

Have tried below code:

    val informix = sqlContext.read.format("jdbc").options(Map("url" -> "urlname",
    "user" -> "username",
    "password" -> "xxxxx",
    "dbtable" -> "tablename",
    "driver" -> "com.informix.jdbc.IfxDriver"
    ).option("inferSchema", "false").option("nullValue","null")).load()

    informix.write.format("com.databricks.spark.csv").save("pathname")

We are getting below error:

java.sql.SQLException:systemerror:java.lang.NumberFormatException

We are having colum name contains Integer data values in source. However, we want to store on HDFS without considering the datatype? Please suggest ways to save to save the DF on HDFS.