Fixes a few warnings.

cottontaildb-cli/src/main/kotlin/org/vitrivr/cottontail/Playground.kt

@@ -0,0 +1,61 @@
+package org.vitrivr.cottontail
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.DecodeSequenceMode
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.decodeToSequence
+import kotlinx.serialization.json.encodeToStream
+import java.nio.file.Files
+import java.nio.file.Paths
+import java.nio.file.StandardOpenOption
+import java.util.*
+
+/**
+ *
+ * @author Ralph Gasser
+ * @version 1.0
+ */
+
+fun main(args: Array<String>) {
+    val path = Paths.get("/Users/rgasser/Downloads/package/warren.VBSLHE.descriptor_file.0.json")
+    val json = Json { prettyPrint = true }
+    Files.newInputStream(path, StandardOpenOption.READ).use { input ->
+        val buffer = LinkedList<FileDescriptor>()
+        var index = 0
+        val descriptors = Json.decodeToSequence(input, FileDescriptor.serializer(), DecodeSequenceMode.ARRAY_WRAPPED)
+        for (descriptor in descriptors) {
+            buffer.add(descriptor)
+            if (buffer.size == 50_000) {
+                write(index++, buffer)
+                buffer.clear()
+            }
+        }
+        write(index, buffer)
+    }
+}
+
+/**
+ *
+ */
+fun write(index: Int, buffer: LinkedList<FileDescriptor>) {
+    val path = Paths.get("/Users/rgasser/Downloads/package/out/warren.VBSLHE.descriptor_file.$index.json")
+    Files.newOutputStream(path, StandardOpenOption.CREATE, StandardOpenOption.WRITE).use { output ->
+        Json.encodeToStream(ListSerializer(FileDescriptor.serializer()), buffer, output)
+    }
+}
+
+@Serializable
+data class Descriptor(val descriptorId: String, val retrievableId: String, val descriptor: FloatArray)
+
+@Serializable
+data class Retrievable(val retrievableId: String, val type: String)
+
+@Serializable
+data class Relationship(val objectId: String, val subjectId: String, val predicate: String)
+
+@Serializable
+data class FileDescriptor(val descriptorId: String = UUID.randomUUID().toString(), val retrievableId: String, val size: Int, val path: String) {}
+
+@Serializable
+data class TimeDescriptor(val descriptorId: String, val retrievableId: String, val start: Long, val end: Long)

cottontaildb-dbms/src/main/kotlin/org/vitrivr/cottontail/server/grpc/services/TransactionalGrpcService.kt

@@ -30,7 +30,7 @@ import kotlin.time.ExperimentalTime
 import kotlin.time.TimeSource
 
 /**
- * A facility common to all service that handle [TransactionManager.TransactionImpl]s over gRPC.
+ * A facility common to all service that handle [TransactionManager.AbstractTransaction]s over gRPC.
  *
  * @author Ralph Gasser
  * @version 1.5.0

cottontaildb-dbms/src/test/kotlin/org/vitrivr/cottontail/server/grpc/DMLServiceTest.kt

@@ -325,7 +325,6 @@ class DMLServiceTest : AbstractClientTest() {
     fun testInvalidNullInsert() {
         val entries = TEST_COLLECTION_SIZE * 5
         val batchSize = 1000
-        val stringLength = 200
 
         /* Start large insert. */
         val txId = this.client.begin()

cottontaildb-dbms/src/testFixtures/kotlin/org/vitrivr/cottontail/test/GrpcTestUtils.kt

@@ -115,7 +115,7 @@ object GrpcTestUtils {
      */
     fun populateVectorEntity(client: SimpleClient) {
         val batch = BatchInsert(TestConstants.TEST_VECTOR_ENTITY_NAME.fqn)
-            .columns(ID_COLUMN_NAME, STRING_COLUMN_NAME, INT_COLUMN_NAME, TestConstants.TWOD_COLUMN_NAME)
+            .columns(ID_COLUMN_NAME, STRING_COLUMN_NAME, INT_COLUMN_NAME,  TWOD_COLUMN_NAME)
         val random = Random.Default
         repeat(TestConstants.TEST_COLLECTION_SIZE) {
             val lat = random.nextFloat() + random.nextInt(0, 50)