2.13 fixes

Author: nikhil-zlai

.bazelrc

@@ -9,8 +9,8 @@ common:scala_2.13 --define=SCALA_VERSION=2.13.12
 # Default scala version to 2.12
 # To set a different default Scala version, add the following to .bazelrc.local:
 # common --config scala_2.12
-common --repo_env=SCALA_VERSION=2.12.18
-common --define=SCALA_VERSION=2.12.18
+common --repo_env=SCALA_VERSION=2.13.12
+common --define=SCALA_VERSION=2.13.12
 
 build --java_language_version=11
 build --java_runtime_version=11

online/src/main/scala/ai/chronon/online/fetcher/GroupByResponseHandler.scala

@@ -12,6 +12,7 @@ import org.slf4j.{Logger, LoggerFactory}
 
 import java.util
 import scala.util.{Failure, Success, Try}
+import scala.collection.Seq
 
 class GroupByResponseHandler(fetchContext: FetchContext, metadataStore: MetadataStore) extends FetcherCache {