Scala: Reading data from scylla throws exception - scala

Question

I am new to scala and to run a simple query to retrieve some data from scylla. Here is my code:
val my_name = "test"
val cluster = ScyllaConnector.getCluster(clusterIpString, scyllaPreferredDc, scyllaUsername, scyllaPassword)
val session = cluster.connect(keySpace)
val preparedStatement: PreparedStatement = session.prepare(GOID_QUERY)
val nameResults = session.execute(preparedStatement.bind(my_name))
val nameResult = nameResults.one()
if(nameResult != null){
println("Here")
val id_recent = nameResult.getSet("id_recent", classOf[String])
println(id_recent)
}
session.close()
cluster.close()
Throws:
Exception in thread "main"
com.datastax.driver.core.exceptions.CodecNotFoundException: Codec not
found for requested operation: [varchar <->
java.util.Set<java.lang.String>] at
com.datastax.driver.core.CodecRegistry.notFound(CodecRegistry.java:679)
at
com.datastax.driver.core.CodecRegistry.createCodec(CodecRegistry.java:526)
at
com.datastax.driver.core.CodecRegistry.findCodec(CodecRegistry.java:506)
at
com.datastax.driver.core.CodecRegistry.access$200(CodecRegistry.java:140)
at
com.datastax.driver.core.CodecRegistry$TypeCodecCacheLoader.load(CodecRegistry.java:211)
at
com.datastax.driver.core.CodecRegistry$TypeCodecCacheLoader.load(CodecRegistry.java:208)
at
shadeio.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
at
shadeio.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
at
shadeio.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
at shadeio.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
at shadeio.common.cache.LocalCache.get(LocalCache.java:3937) at
shadeio.common.cache.LocalCache.getOrLoad(LocalCache.java:3941) at
shadeio.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
at
com.datastax.driver.core.CodecRegistry.lookupCodec(CodecRegistry.java:480)
at
com.datastax.driver.core.CodecRegistry.codecFor(CodecRegistry.java:448)
at
com.datastax.driver.core.AbstractGettableByIndexData.codecFor(AbstractGettableByIndexData.java:73)
at
com.datastax.driver.core.AbstractGettableByIndexData.getSet(AbstractGettableByIndexData.java:318)
at
com.datastax.driver.core.AbstractGettableData.getSet(AbstractGettableData.java:26)
at
com.datastax.driver.core.AbstractGettableByIndexData.getSet(AbstractGettableByIndexData.java:307)
at
com.datastax.driver.core.AbstractGettableData.getSet(AbstractGettableData.java:26)
at
com.datastax.driver.core.AbstractGettableData.getSet(AbstractGettableData.java:215)
at
class.path$.main(CodeName.scala:184)
at
class.path.main(CodeName.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
at
org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:845)
at
org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:161)
at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:184)
at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:86)
at
org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:920)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:929)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
I am sure the problem rises in the getSet line where it's asking for classOf[String] but I'm not sure what to replace it with.
Here is my table definition:
-- auto-generated definition
create table name_table
(
name text,
id_recent text,
primary key (name)
)

Answer 1

You have incompatible types - you have text type in the database, but you're trying to retrieve it as a set of strings ([varchar <-> java.util.Set<java.lang.String>] message directly says about that).
Replace getSet with getString, and if you need a set, then you need to construct it yourself from retrieved string