Is Datastax UUIDs a wrapper for java.util.UUID [duplicate] - apache-spark

Question

below is the code block and the error recieved
> creating a temporary views
sqlcontext.sql("""CREATE TEMPORARY VIEW temp_pay_txn_stage
USING org.apache.spark.sql.cassandra
OPTIONS (
table "t_pay_txn_stage",
keyspace "ks_pay",
cluster "Test Cluster",
pushdown "true"
)""".stripMargin)
sqlcontext.sql("""CREATE TEMPORARY VIEW temp_pay_txn_source
USING org.apache.spark.sql.cassandra
OPTIONS (
table "t_pay_txn_source",
keyspace "ks_pay",
cluster "Test Cluster",
pushdown "true"
)""".stripMargin)
querying the views as below to be able to get new records from stage not present in source .
Scala> val df_newrecords = sqlcontext.sql("""Select UUID(),
| |stage.order_id,
| |stage.order_description,
| |stage.transaction_id,
| |stage.pre_transaction_freeze_balance,
| |stage.post_transaction_freeze_balance,
| |toTimestamp(now()),
| |NULL,
| |1 from temp_pay_txn_stage stage left join temp_pay_txn_source source on stage.order_id=source.order_id and stage.transaction_id=source.transaction_id where
| |source.order_id is null and source.transaction_id is null""")`
org.apache.spark.sql.AnalysisException: Undefined function: 'uuid()'. This function is neither a registered temporary function nor a permanent function registered in the database 'default'.; line 1 pos 7
i am trying to get the UUIDs generated , but getting this error.

Answer 1

Here is a Simple Example How you can generate timeuuid :
import org.apache.spark.sql.SQLContext
val sqlcontext = new SQLContext(sc)
import sqlcontext.implicits._
//Import UUIDs that contains the method timeBased()
import com.datastax.driver.core.utils.UUIDs
//user define function timeUUID which will retrun time based uuid
val timeUUID = udf(() => UUIDs.timeBased().toString)
//sample query to test, you can change it to yours
val df_newrecords = sqlcontext.sql("SELECT 1 as data UNION SELECT 2 as data").withColumn("time_uuid", timeUUID())
//print all the rows
df_newrecords.collect().foreach(println)
Output :
[1,9a81b3c0-170b-11e7-98bf-9bb55f3128dd]
[2,9a831350-170b-11e7-98bf-9bb55f3128dd]
Source : https://stackoverflow.com/a/37232099/2320144
https://docs.datastax.com/en/drivers/java/2.0/com/datastax/driver/core/utils/UUIDs.html#timeBased--