Maintain TensorType in documents

35 files changed, 229 insertions, 152 deletions

diff --git a/config-model/src/main/java/com/yahoo/documentmodel/VespaDocumentType.java b/config-model/src/main/java/com/yahoo/documentmodel/VespaDocumentType.java
index 793a5fcff6c..09aa55f776b 100644
--- a/config-model/src/main/java/com/yahoo/documentmodel/VespaDocumentType.java
+++ b/config-model/src/main/java/com/yahoo/documentmodel/VespaDocumentType.java
@@ -32,7 +32,6 @@ public class VespaDocumentType {
         vespa.add(PositionDataType.INSTANCE);
         vespa.add(DataType.URI);
         vespa.add(DataType.PREDICATE);
-        vespa.add(DataType.TENSOR);
         return vespa;
     }
 
diff --git a/config-model/src/main/java/com/yahoo/searchdefinition/document/Attribute.java b/config-model/src/main/java/com/yahoo/searchdefinition/document/Attribute.java
index 950ec791368..5856caeb692 100644
--- a/config-model/src/main/java/com/yahoo/searchdefinition/document/Attribute.java
+++ b/config-model/src/main/java/com/yahoo/searchdefinition/document/Attribute.java
@@ -25,10 +25,6 @@ public final class Attribute implements Cloneable, Serializable {
     private Type type;
     private CollectionType collectionType;
 
-    /** True if only the enum information should be read from this attribute
-     *  (i.e. the actual values are not relevant, only which documents have the
-     *   same values) Used for collapsing and unique.
-     */
     private boolean removeIfZero = false;
     private boolean createIfNonExistent = false;
     private boolean enableBitVectors = false;
@@ -224,31 +220,22 @@ public final class Attribute implements Cloneable, Serializable {
     }
 
     /** Converts to the right field type from an attribute type */
-    public static DataType convertAttrType(Type attrType) {
-        if (attrType== Type.STRING) {
-            return DataType.STRING;
-        } else if (attrType== Type.INTEGER) {
-            return DataType.INT;
-        } else if (attrType== Type.LONG) {
-            return DataType.LONG;
-        } else if (attrType== Type.FLOAT) {
-            return DataType.FLOAT;
-        } else if (attrType== Type.DOUBLE) {
-            return DataType.DOUBLE;
-        } else if (attrType == Type.BYTE) {
-            return DataType.BYTE;
-        } else if (attrType == Type.PREDICATE) {
-            return DataType.PREDICATE;
-        } else if (attrType == Type.TENSOR) {
-            return DataType.TENSOR;
-        } else {
-            throw new IllegalArgumentException("Don't know which attribute type to " +
-                    "convert " + attrType + " to");
+    private DataType toDataType(Type attributeType) {
+        switch (attributeType) {
+            case STRING : return DataType.STRING;
+            case INTEGER: return DataType.INT;
+            case LONG: return DataType.LONG;
+            case FLOAT: return DataType.FLOAT;
+            case DOUBLE: return DataType.DOUBLE;
+            case BYTE: return DataType.BYTE;
+            case PREDICATE: return DataType.PREDICATE;
+            case TENSOR: DataType.getTensor(tensorType.orElseThrow(IllegalStateException::new));
+            default: throw new IllegalArgumentException("Unknown attribute type " + attributeType);
         }
     }
 
     public DataType getDataType() {
-        DataType dataType = Attribute.convertAttrType(type);
+        DataType dataType = toDataType(type);
         if (collectionType.equals(Attribute.CollectionType.ARRAY)) {
             return DataType.getArray(dataType);
         } else if (collectionType.equals(Attribute.CollectionType.WEIGHTEDSET)) {
diff --git a/config-model/src/main/java/com/yahoo/searchdefinition/processing/TensorFieldProcessor.java b/config-model/src/main/java/com/yahoo/searchdefinition/processing/TensorFieldProcessor.java
index ae16f6cfed8..f618c55adfc 100644
--- a/config-model/src/main/java/com/yahoo/searchdefinition/processing/TensorFieldProcessor.java
+++ b/config-model/src/main/java/com/yahoo/searchdefinition/processing/TensorFieldProcessor.java
@@ -23,13 +23,11 @@ public class TensorFieldProcessor extends Processor {
     @Override
     public void process() {
         for (SDField field : search.allFieldsList()) {
-            if (field.getDataType() == DataType.TENSOR) {
-                warnUseOfTensorFieldAsAttribute(field);
-                validateIndexingScripsForTensorField(field);
-                validateAttributeSettingForTensorField(field);
-            } else {
-                validateDataTypeForField(field);
-            }
+            if ( ! (field.getDataType() instanceof TensorDataType)) continue;
+
+            warnUseOfTensorFieldAsAttribute(field);
+            validateIndexingScripsForTensorField(field);
+            validateAttributeSettingForTensorField(field);
         }
     }
 
@@ -55,9 +53,4 @@ public class TensorFieldProcessor extends Processor {
         }
     }
 
-    private void validateDataTypeForField(SDField field) {
-        if (field.getDataType().getPrimitiveType() == DataType.TENSOR) {
-            fail(search, field, "A field with collection type of tensor is not supported. Use simple type 'tensor' instead.");
-        }
-    }
 }
diff --git a/config-model/src/main/java/com/yahoo/vespa/model/application/validation/SearchDataTypeValidator.java b/config-model/src/main/java/com/yahoo/vespa/model/application/validation/SearchDataTypeValidator.java
index c03fb0617b8..1d39d1e6928 100644
--- a/config-model/src/main/java/com/yahoo/vespa/model/application/validation/SearchDataTypeValidator.java
+++ b/config-model/src/main/java/com/yahoo/vespa/model/application/validation/SearchDataTypeValidator.java
@@ -43,7 +43,7 @@ public class SearchDataTypeValidator extends Validator {
         for (Field field : doc.fieldSet()) {
             DataType fieldType = field.getDataType();
             disallowIndexingOfMaps(cluster, def, field);
-            if (!validateDataType(fieldType)) {
+            if ( ! isSupportedInSearchClusters(fieldType)) {
                 throw new IllegalArgumentException("Field type '" + fieldType.getName() + "' is illegal for search " +
                                                    "clusters (field '" + field.getName() + "' in definition '" +
                                                    def.getName() + "' for cluster '" + cluster.getClusterName() + "').");
@@ -51,28 +51,30 @@ public class SearchDataTypeValidator extends Validator {
         }
     }
 
-    private boolean validateDataType(DataType dataType) {
-        if (dataType instanceof ArrayDataType ||
-            dataType instanceof WeightedSetDataType)
-        {
-            return validateDataType(((CollectionDataType)dataType).getNestedType());
+    private boolean isSupportedInSearchClusters(DataType dataType) {
+        if (dataType instanceof ArrayDataType || dataType instanceof WeightedSetDataType) {
+            return isSupportedInSearchClusters(((CollectionDataType)dataType).getNestedType());
         }
-        if (dataType instanceof StructDataType) {
+        else if (dataType instanceof StructDataType) {
             return true; // Struct will work for summary TODO maybe check individual fields
         }
-        if (dataType instanceof MapDataType) {
+        else if (dataType instanceof MapDataType) {
             return true; // Maps will work for summary, see disallowIndexingOfMaps()
         }
-        return dataType.equals(DataType.INT) ||
-               dataType.equals(DataType.FLOAT) ||
-               dataType.equals(DataType.STRING) ||
-               dataType.equals(DataType.RAW) ||
-               dataType.equals(DataType.LONG) ||
-               dataType.equals(DataType.DOUBLE) ||
-               dataType.equals(DataType.URI) ||
-               dataType.equals(DataType.BYTE) ||
-               dataType.equals(DataType.PREDICATE) ||
-               dataType.equals(DataType.TENSOR);
+        else if (dataType instanceof TensorDataType) {
+            return true;
+        }
+        else {
+            return dataType.equals(DataType.INT) ||
+                   dataType.equals(DataType.FLOAT) ||
+                   dataType.equals(DataType.STRING) ||
+                   dataType.equals(DataType.RAW) ||
+                   dataType.equals(DataType.LONG) ||
+                   dataType.equals(DataType.DOUBLE) ||
+                   dataType.equals(DataType.URI) ||
+                   dataType.equals(DataType.BYTE) ||
+                   dataType.equals(DataType.PREDICATE);
+        }
     }
 
     private void disallowIndexingOfMaps(AbstractSearchCluster cluster, SearchDefinition def, Field field) {
diff --git a/document/src/main/java/com/yahoo/document/ArrayDataType.java b/document/src/main/java/com/yahoo/document/ArrayDataType.java
index 640bd94bd1c..4b24bb1ae00 100644
--- a/document/src/main/java/com/yahoo/document/ArrayDataType.java
+++ b/document/src/main/java/com/yahoo/document/ArrayDataType.java
@@ -8,9 +8,10 @@ import java.util.ArrayList;
 import java.util.List;
 
 /**
- * @author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
+ * @author Einar M R Rosenvinge
  */
 public class ArrayDataType extends CollectionDataType {
+
     // The global class identifier shared with C++.
     public static int classId = registerClass(Ids.document + 54, ArrayDataType.class);
 
diff --git a/document/src/main/java/com/yahoo/document/DataType.java b/document/src/main/java/com/yahoo/document/DataType.java
index 19726ac7b99..3fb1e75262e 100644
--- a/document/src/main/java/com/yahoo/document/DataType.java
+++ b/document/src/main/java/com/yahoo/document/DataType.java
@@ -14,6 +14,7 @@ import com.yahoo.document.datatypes.Raw;
 import com.yahoo.document.datatypes.StringFieldValue;
 import com.yahoo.document.datatypes.TensorFieldValue;
 import com.yahoo.document.datatypes.UriFieldValue;
+import com.yahoo.tensor.TensorType;
 import com.yahoo.vespa.objects.Identifiable;
 import com.yahoo.vespa.objects.Ids;
 import com.yahoo.vespa.objects.ObjectVisitor;
@@ -50,14 +51,13 @@ public abstract class DataType extends Identifiable implements Serializable, Com
     public final static PrimitiveDataType URI = new PrimitiveDataType("uri", 10, UriFieldValue.class, new UriFieldValue.Factory());
     public final static NumericDataType BYTE = new NumericDataType("byte", 16, ByteFieldValue.class, ByteFieldValue.getFactory());
     public final static PrimitiveDataType PREDICATE = new PrimitiveDataType("predicate", 20, PredicateFieldValue.class, PredicateFieldValue.getFactory());
-    public final static PrimitiveDataType TENSOR = new PrimitiveDataType("tensor", 21, TensorFieldValue.class, TensorFieldValue.getFactory());
-    // ADDITIONAL parametrized types added at runtime: map, struct, array, weighted set, annotation reference
+    // ADDITIONAL parametrized types added at runtime: map, struct, array, weighted set, annotation reference, tensor
 
     // Tags are converted to weightedset<string> when reading the search definition TODO: Remove it
     public final static WeightedSetDataType TAG = new WeightedSetDataType(DataType.STRING, true, true);
 
     public static int lastPredefinedDataTypeId() {
-        return 21;
+        return 20;
     }
 
     /** Set to true when this type is registered in a type manager. From that time we should refuse changes. */
@@ -196,6 +196,11 @@ public abstract class DataType extends Identifiable implements Serializable, Com
         return new WeightedSetDataType(type, createIfNonExistent, removeIfZero);
     }
 
+    /** Returns the given tensor type as a DataType */
+    public static TensorDataType getTensor(TensorType type) {
+        return new TensorDataType(type);
+    }
+    
     public String getName() {
         return name;
     }
diff --git a/document/src/main/java/com/yahoo/document/Document.java b/document/src/main/java/com/yahoo/document/Document.java
index 34c952e1cec..e1d912b4e51 100644
--- a/document/src/main/java/com/yahoo/document/Document.java
+++ b/document/src/main/java/com/yahoo/document/Document.java
@@ -26,7 +26,7 @@ import java.util.Map;
  * be removed soon.
  *
  * @author bratseth
- * @author <a href="einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
+ * @author Einar M R Rosenvinge
  */
 public class Document extends StructuredFieldValue {
 
@@ -267,7 +267,9 @@ public class Document extends StructuredFieldValue {
     }
 
     /** Returns true if the argument is a document which has the same set of values */
+    @Override
     public boolean equals(Object o) {
+        if (o == this) return true;
         if (!(o instanceof Document)) return false;
         Document other = (Document) o;
         return (super.equals(o) && docId.equals(other.docId) &&
@@ -394,4 +396,5 @@ public class Document extends StructuredFieldValue {
         comp = body.compareTo(otherValue.body);
         return comp;
     }
+
 }
diff --git a/document/src/main/java/com/yahoo/document/Field.java b/document/src/main/java/com/yahoo/document/Field.java
index 86543916b42..b80d92e0e4d 100644
--- a/document/src/main/java/com/yahoo/document/Field.java
+++ b/document/src/main/java/com/yahoo/document/Field.java
@@ -13,7 +13,7 @@ import java.io.Serializable;
  * A name and type. Fields are contained in document types to describe their fields,
  * but is also used to represent name/type pairs which are not part of document types.
  *
- * @author <a href="mailto:thomasg@yahoo-inc.com">Thomas Gundersen</a>
+ * @author Thomas Gundersen
  * @author bratseth
  */
 public class Field extends FieldBase implements FieldSet, Comparable, Serializable {
diff --git a/document/src/main/java/com/yahoo/document/PrimitiveDataType.java b/document/src/main/java/com/yahoo/document/PrimitiveDataType.java
index a0024bb0497..23bf4b43ccf 100644
--- a/document/src/main/java/com/yahoo/document/PrimitiveDataType.java
+++ b/document/src/main/java/com/yahoo/document/PrimitiveDataType.java
@@ -8,9 +8,10 @@ import com.yahoo.vespa.objects.ObjectVisitor;
 import java.util.Objects;
 
 /**
- * @author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
+ * @author Einar M R Rosenvinge
  */
 public class PrimitiveDataType extends DataType {
+
     public static abstract class Factory {
         public abstract FieldValue create();
     }
diff --git a/document/src/main/java/com/yahoo/document/TensorDataType.java b/document/src/main/java/com/yahoo/document/TensorDataType.java
new file mode 100644
index 00000000000..46d5633f9f7
--- /dev/null
+++ b/document/src/main/java/com/yahoo/document/TensorDataType.java
@@ -0,0 +1,48 @@
+package com.yahoo.document;
+
+import com.yahoo.document.datatypes.FieldValue;
+import com.yahoo.document.datatypes.TensorFieldValue;
+import com.yahoo.tensor.TensorType;
+import com.yahoo.vespa.objects.Ids;
+
+/**
+ * A DataType containing a tensor type
+ * 
+ * @author bratseth
+ */
+public class TensorDataType extends DataType {
+
+    private final TensorType tensorType;
+    
+    // The global class identifier shared with C++.
+    public static int classId = registerClass(Ids.document + 59, TensorDataType.class);
+
+    public TensorDataType(TensorType tensorType) {
+        super(tensorType.toString(), 0);
+        this.tensorType = tensorType;
+        setId(getName().toLowerCase().hashCode());
+    }
+
+    public TensorDataType clone() {
+        return (TensorDataType)super.clone();
+    }
+
+    @Override
+    public FieldValue createFieldValue() {
+        return new TensorFieldValue(tensorType);
+    }
+
+    @Override
+    public Class<? extends TensorFieldValue> getValueClass() {
+        return TensorFieldValue.class;
+    }
+
+    @Override
+    public boolean isValueCompatible(FieldValue value) {
+        return value != null && TensorFieldValue.class.isAssignableFrom(value.getClass());
+    }
+
+    /** Returns the type of the tensor this field can hold */
+    public TensorType getTensorType() { return tensorType; }
+    
+}
diff --git a/document/src/main/java/com/yahoo/document/datatypes/Array.java b/document/src/main/java/com/yahoo/document/datatypes/Array.java
index 66cc472de69..09fb8b71db1 100644
--- a/document/src/main/java/com/yahoo/document/datatypes/Array.java
+++ b/document/src/main/java/com/yahoo/document/datatypes/Array.java
@@ -16,7 +16,7 @@ import java.util.*;
 /**
  * FieldValue which encapsulates a Array value
  *
- * @author <a href="mailto:einarmr@yahoo-inc.com">Einar M R Rosenvinge</a>
+ * @author Einar M R Rosenvinge
  */
 public final class Array<T extends FieldValue> extends CollectionFieldValue<T> implements List<T> {
 
diff --git a/document/src/main/java/com/yahoo/document/datatypes/Struct.java b/document/src/main/java/com/yahoo/document/datatypes/Struct.java
index 5a01dc33aa1..b5920cb4758 100644
--- a/document/src/main/java/com/yahoo/document/datatypes/Struct.java
+++ b/document/src/main/java/com/yahoo/document/datatypes/Struct.java
@@ -215,7 +215,6 @@ public class Struct extends StructuredFieldValue {
         if (!super.equals(o)) return false;
 
         Struct struct = (Struct) o;
-
         return values.equals(struct.values);
     }
 
@@ -388,4 +387,5 @@ public class Struct extends StructuredFieldValue {
         }
         return fieldType.cast(fieldValue);
     }
+
 }
diff --git a/document/src/main/java/com/yahoo/document/datatypes/StructuredFieldValue.java b/document/src/main/java/com/yahoo/document/datatypes/StructuredFieldValue.java
index b4585a2188d..7957d9b812f 100644
--- a/document/src/main/java/com/yahoo/document/datatypes/StructuredFieldValue.java
+++ b/document/src/main/java/com/yahoo/document/datatypes/StructuredFieldValue.java
@@ -10,7 +10,7 @@ import java.util.List;
 import java.util.Map;
 
 /**
- * @author <a href="mailto:humbe@yahoo-inc.com">H&aring;kon Humberset</a>
+ * @author Håkon Humberset
  */
 public abstract class StructuredFieldValue extends CompositeFieldValue {
 
diff --git a/document/src/main/java/com/yahoo/document/datatypes/TensorFieldValue.java b/document/src/main/java/com/yahoo/document/datatypes/TensorFieldValue.java
index bee29478219..9d8e9a83b5e 100644
--- a/document/src/main/java/com/yahoo/document/datatypes/TensorFieldValue.java
+++ b/document/src/main/java/com/yahoo/document/datatypes/TensorFieldValue.java
@@ -3,11 +3,12 @@ package com.yahoo.document.datatypes;
 
 import com.yahoo.document.DataType;
 import com.yahoo.document.Field;
-import com.yahoo.document.PrimitiveDataType;
+import com.yahoo.document.TensorDataType;
 import com.yahoo.document.serialization.FieldReader;
 import com.yahoo.document.serialization.FieldWriter;
 import com.yahoo.document.serialization.XmlStream;
 import com.yahoo.tensor.Tensor;
+import com.yahoo.tensor.TensorType;
 
 import java.util.Objects;
 import java.util.Optional;
@@ -20,12 +21,18 @@ import java.util.Optional;
 public class TensorFieldValue extends FieldValue {
 
     private Optional<Tensor> tensor;
+    
+    private final TensorDataType dataType;
 
-    public TensorFieldValue() {
-        tensor = Optional.empty();
+    /** Create an empty tensor field value */
+    public TensorFieldValue(TensorType type) {
+        this.dataType = new TensorDataType(type);
+        this.tensor = Optional.empty();
     }
 
+    /** Create a tensor field value containing the given tensor */
     public TensorFieldValue(Tensor tensor) {
+        this.dataType = new TensorDataType(tensor.type());
         this.tensor = Optional.of(tensor);
     }
 
@@ -34,8 +41,8 @@ public class TensorFieldValue extends FieldValue {
     }
 
     @Override
-    public DataType getDataType() {
-        return DataType.TENSOR;
+    public TensorDataType getDataType() {
+        return dataType;
     }
 
     @Override
@@ -51,16 +58,23 @@ public class TensorFieldValue extends FieldValue {
     @Override
     public void assign(Object o) {
         if (o == null) {
-            tensor = Optional.empty();
+            assignTensor(Optional.empty());
         } else if (o instanceof Tensor) {
-            tensor = Optional.of((Tensor)o);
+            assignTensor(Optional.of((Tensor)o));
         } else if (o instanceof TensorFieldValue) {
-            tensor = ((TensorFieldValue)o).getTensor();
+            assignTensor(((TensorFieldValue)o).getTensor());
         } else {
             throw new IllegalArgumentException("Expected class '" + getClass().getName() + "', got '" +
-                    o.getClass().getName() + "'.");
+                                               o.getClass().getName() + "'.");
         }
     }
+    
+    public void assignTensor(Optional<Tensor> tensor) {
+        if (tensor.isPresent() && ! dataType.getTensorType().isAssignableTo(tensor.get().type()))
+            throw new IllegalArgumentException("Type mismatch: Cannot assign tensor of type " + tensor.get().type() +
+                                               " to field of type " + dataType.getTensorType());
+        this.tensor = tensor;
+    }
 
     @Override
     public void serialize(Field field, FieldWriter writer) {
@@ -74,27 +88,14 @@ public class TensorFieldValue extends FieldValue {
 
     @Override
     public boolean equals(Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (!(o instanceof TensorFieldValue)) {
-            return false;
-        }
-        TensorFieldValue rhs = (TensorFieldValue)o;
-        if (!Objects.equals(tensor, rhs.tensor)) {
-            return false;
-        }
+        if (this == o) return true;
+        if ( ! (o instanceof TensorFieldValue)) return false;
+
+        TensorFieldValue other = (TensorFieldValue)o;
+        if ( ! dataType.getTensorType().equals(other.dataType.getTensorType())) return false;
+        if ( ! tensor.equals(other.tensor)) return false;
         return true;
     }
 
-    public static PrimitiveDataType.Factory getFactory() {
-        return new PrimitiveDataType.Factory() {
-
-            @Override
-            public FieldValue create() {
-                return new TensorFieldValue();
-            }
-        };
-    }
 }
 
diff --git a/document/src/main/java/com/yahoo/document/serialization/DocumentReader.java b/document/src/main/java/com/yahoo/document/serialization/DocumentReader.java
index 52a62caf296..5f1b227790b 100644
--- a/document/src/main/java/com/yahoo/document/serialization/DocumentReader.java
+++ b/document/src/main/java/com/yahoo/document/serialization/DocumentReader.java
@@ -9,7 +9,7 @@ import com.yahoo.document.DocumentTypeManager;
 /**
  * This interface is used to implement custom deserialization of document updates.
  *
- * @author <a href="mailto:ravishar@yahoo-inc.com">Ravi Sharma</a>
+ * @author Ravi Sharma
  * @author baldersheim
  */
 public interface DocumentReader {
diff --git a/document/src/main/java/com/yahoo/document/serialization/VespaDocumentDeserializer42.java b/document/src/main/java/com/yahoo/document/serialization/VespaDocumentDeserializer42.java
index 9e764aae798..6e9495b1437 100644
--- a/document/src/main/java/com/yahoo/document/serialization/VespaDocumentDeserializer42.java
+++ b/document/src/main/java/com/yahoo/document/serialization/VespaDocumentDeserializer42.java
@@ -115,8 +115,8 @@ public class VespaDocumentDeserializer42 extends VespaDocumentSerializer42 imple
         // Verify that we have correct version
         version = getShort(null);
         if (version < 6 || version > Document.SERIALIZED_VERSION) {
-            throw new DeserializationException(
-                    "Unknown version " + version + ", expected " + Document.SERIALIZED_VERSION + ".");
+            throw new DeserializationException("Unknown version " + version + ", expected " + 
+                                               Document.SERIALIZED_VERSION + ".");
         }
 
         int dataLength = 0;
@@ -278,7 +278,7 @@ public class VespaDocumentDeserializer42 extends VespaDocumentSerializer42 imple
         int encodedTensorLength = buf.getInt1_4Bytes();
         if (encodedTensorLength > 0) {
             byte[] encodedTensor = getBytes(null, encodedTensorLength);
-            value.assign(TypedBinaryFormat.decode(encodedTensor));
+            value.assign(TypedBinaryFormat.decode(value.getDataType().getTensorType(), encodedTensor));
         } else {
             value.clear();
         }
@@ -328,7 +328,7 @@ public class VespaDocumentDeserializer42 extends VespaDocumentSerializer42 imple
             fieldIdsAndLengths.add(new Tuple2<>(getInt1_4Bytes(null), getInt2_4_8Bytes(null)));
         }
 
-        //save a reference to the big buffer we're reading from:
+        // save a reference to the big buffer we're reading from:
         GrowableByteBuffer bigBuf = buf;
 
         if (version < 7) {
diff --git a/document/src/test/java/com/yahoo/document/DocumentUpdateTestCase.java b/document/src/test/java/com/yahoo/document/DocumentUpdateTestCase.java
index 413d1581e58..02773c7dad0 100644
--- a/document/src/test/java/com/yahoo/document/DocumentUpdateTestCase.java
+++ b/document/src/test/java/com/yahoo/document/DocumentUpdateTestCase.java
@@ -10,6 +10,7 @@ import com.yahoo.document.update.FieldUpdate;
 import com.yahoo.document.update.ValueUpdate;
 import com.yahoo.io.GrowableByteBuffer;
 import com.yahoo.tensor.Tensor;
+import com.yahoo.tensor.TensorType;
 
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -43,6 +44,7 @@ public class DocumentUpdateTestCase extends junit.framework.TestCase {
 
     private final String documentId = "doc:something:foooo";
     private final String tensorField = "tensorfield";
+    private final TensorType tensorType = new TensorType.Builder().mapped("x").build();
 
     private Document createDocument() {
         return new Document(docMan.getDocumentType("foobar"), new DocumentId(documentId));
@@ -60,7 +62,7 @@ public class DocumentUpdateTestCase extends junit.framework.TestCase {
         DataType stringwset = DataType.getWeightedSet(DataType.STRING);
         docType.addField(new Field("strwset", stringwset));
 
-        docType.addField(new Field(tensorField, DataType.TENSOR));
+        docType.addField(new Field(tensorField, new TensorDataType(tensorType)));
         docMan.register(docType);
 
         docType2 = new DocumentType("otherdoctype");
@@ -625,7 +627,7 @@ public class DocumentUpdateTestCase extends junit.framework.TestCase {
     private DocumentUpdate createTensorAssignUpdate() {
         DocumentUpdate result = new DocumentUpdate(docType, new DocumentId(documentId));
         result.addFieldUpdate(FieldUpdate.createAssign(docType.getField(tensorField),
-                createTensorFieldValue("{{x:0}:2.0}")));
+                              createTensorFieldValue("{{x:0}:2.0}")));
         return result;
     }
 
diff --git a/document/src/test/java/com/yahoo/document/datatypes/TensorFieldValueTestCase.java b/document/src/test/java/com/yahoo/document/datatypes/TensorFieldValueTestCase.java
index 80386141968..c94c917d2ca 100644
--- a/document/src/test/java/com/yahoo/document/datatypes/TensorFieldValueTestCase.java
+++ b/document/src/test/java/com/yahoo/document/datatypes/TensorFieldValueTestCase.java
@@ -2,6 +2,7 @@
 package com.yahoo.document.datatypes;
 
 import com.yahoo.tensor.Tensor;
+import com.yahoo.tensor.TensorType;
 import org.junit.Test;
 
 import static org.junit.Assert.assertFalse;
@@ -13,8 +14,8 @@ import static org.junit.Assert.assertTrue;
  */
 public class TensorFieldValueTestCase {
 
-    private static TensorFieldValue createFieldValue(String tensor) {
-        return new TensorFieldValue(Tensor.from(tensor));
+    private static TensorFieldValue createFieldValue(String tensorString) {
+        return new TensorFieldValue(Tensor.from(tensorString));
     }
 
     @Test
@@ -23,20 +24,27 @@ public class TensorFieldValueTestCase {
     }
 
     @Test
+    public void requireThatDifferentTensorTypesWithEmptyValuesAreNotEqual() {
+        TensorFieldValue field1 = new TensorFieldValue(new TensorType.Builder().mapped("x").build());
+        TensorFieldValue field2 = new TensorFieldValue(new TensorType.Builder().indexed("y").build());
+        assertFalse(field1.equals(field2));
+    }
+
+    @Test
     public void requireThatDifferentTensorValuesAreNotEqual() {
-        TensorFieldValue lhs = createFieldValue("{{x:0}:2.0}");
-        TensorFieldValue rhs = createFieldValue("{{x:0}:3.0}");
-        assertFalse(lhs.equals(rhs));
-        assertFalse(lhs.equals(new TensorFieldValue()));
+        TensorFieldValue field1 = createFieldValue("{{x:0}:2.0}");
+        TensorFieldValue field2 = createFieldValue("{{x:0}:3.0}");
+        assertFalse(field1.equals(field2));
+        assertFalse(field1.equals(new TensorFieldValue(TensorType.empty)));
     }
 
     @Test
     public void requireThatSameTensorValueIsEqual() {
         Tensor tensor = Tensor.from("{{x:0}:2.0}");
-        TensorFieldValue lhs = new TensorFieldValue(tensor);
-        TensorFieldValue rhs = new TensorFieldValue(tensor);
-        assertTrue(lhs.equals(lhs));
-        assertTrue(lhs.equals(rhs));
-        assertTrue(lhs.equals(createFieldValue("{{x:0}:2.0}")));
+        TensorFieldValue field1 = new TensorFieldValue(tensor);
+        TensorFieldValue field2 = new TensorFieldValue(tensor);
+        assertTrue(field1.equals(field1));
+        assertTrue(field1.equals(field2));
+        assertTrue(field1.equals(createFieldValue("{{x:0}:2.0}")));
     }
 }
diff --git a/document/src/test/java/com/yahoo/document/json/DocumentUpdateJsonSerializerTest.java b/document/src/test/java/com/yahoo/document/json/DocumentUpdateJsonSerializerTest.java
index ffec7927ab3..a0f993fd2fc 100644
--- a/document/src/test/java/com/yahoo/document/json/DocumentUpdateJsonSerializerTest.java
+++ b/document/src/test/java/com/yahoo/document/json/DocumentUpdateJsonSerializerTest.java
@@ -10,7 +10,9 @@ import com.yahoo.document.DocumentUpdate;
 import com.yahoo.document.Field;
 import com.yahoo.document.MapDataType;
 import com.yahoo.document.PositionDataType;
+import com.yahoo.document.TensorDataType;
 import com.yahoo.document.WeightedSetDataType;
+import com.yahoo.tensor.TensorType;
 import com.yahoo.text.Utf8;
 import org.junit.Test;
 
@@ -27,6 +29,7 @@ import static com.yahoo.test.json.JsonTestHelper.inputJson;
  */
 public class DocumentUpdateJsonSerializerTest {
 
+    final static TensorType tensorType = new TensorType.Builder().mapped("x").mapped("y").build();
     final static DocumentTypeManager types = new DocumentTypeManager();
     final static JsonFactory parserFactory = new JsonFactory();
     final static DocumentType docType = new DocumentType("doctype");
@@ -39,7 +42,7 @@ public class DocumentUpdateJsonSerializerTest {
         docType.addField(new Field("float_field", DataType.FLOAT));
         docType.addField(new Field("double_field", DataType.DOUBLE));
         docType.addField(new Field("byte_field", DataType.BYTE));
-        docType.addField(new Field("tensor_field", DataType.TENSOR));
+        docType.addField(new Field("tensor_field", new TensorDataType(tensorType)));
         docType.addField(new Field("predicate_field", DataType.PREDICATE));
         docType.addField(new Field("raw_field", DataType.RAW));
         docType.addField(new Field("int_array", new ArrayDataType(DataType.INT)));
diff --git a/document/src/test/java/com/yahoo/document/json/JsonReaderTestCase.java b/document/src/test/java/com/yahoo/document/json/JsonReaderTestCase.java
index 6c46f743332..e61ed6cf541 100644
--- a/document/src/test/java/com/yahoo/document/json/JsonReaderTestCase.java
+++ b/document/src/test/java/com/yahoo/document/json/JsonReaderTestCase.java
@@ -19,6 +19,7 @@ import com.yahoo.document.Field;
 import com.yahoo.document.MapDataType;
 import com.yahoo.document.PositionDataType;
 import com.yahoo.document.StructDataType;
+import com.yahoo.document.TensorDataType;
 import com.yahoo.document.WeightedSetDataType;
 import com.yahoo.document.datatypes.Array;
 import com.yahoo.document.datatypes.FieldValue;
@@ -38,6 +39,7 @@ import com.yahoo.document.update.FieldUpdate;
 import com.yahoo.document.update.MapValueUpdate;
 import com.yahoo.document.update.ValueUpdate;
 import com.yahoo.tensor.Tensor;
+import com.yahoo.tensor.TensorType;
 import com.yahoo.text.Utf8;
 import org.apache.commons.codec.binary.Base64;
 import org.junit.After;
@@ -66,11 +68,12 @@ import static org.junit.Assert.*;
 /**
  * Basic test of JSON streams to Vespa document instances.
  *
- * @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
+ * @author Steinar Knutsen
  */
 public class JsonReaderTestCase {
-    DocumentTypeManager types;
-    JsonFactory parserFactory;
+
+    private DocumentTypeManager types;
+    private JsonFactory parserFactory;
 
     @Rule
     public ExpectedException exception = ExpectedException.none();
@@ -133,7 +136,8 @@ public class JsonReaderTestCase {
         }
         {
             DocumentType x = new DocumentType("testtensor");
-            x.addField(new Field("tensorfield", DataType.TENSOR));
+            TensorType tensorType = new TensorType.Builder().mapped("x").mapped("y").build();
+            x.addField(new Field("tensorfield", new TensorDataType(tensorType)));
             types.registerDocumentType(x);
         }
         {
@@ -1082,16 +1086,6 @@ public class JsonReaderTestCase {
     }
 
     @Test
-    public void testParsingOfTensorWithSingleCellWithoutValue() {
-        assertTensorField("{{x:a}:0.0}",
-                createPutWithTensor("{ "
-                        + "  \"cells\": [ "
-                        + "    { \"address\": { \"x\": \"a\" } } "
-                        + "  ]"
-                        + "}"));
-    }
-
-    @Test
     public void testAssignUpdateOfEmptyTensor() {
         assertTensorAssignUpdate("{}", createAssignUpdateWithTensor("{}"));
     }
diff --git a/document/src/test/java/com/yahoo/document/json/JsonWriterTestCase.java b/document/src/test/java/com/yahoo/document/json/JsonWriterTestCase.java
index 171676be694..99f7deb7bd7 100644
--- a/document/src/test/java/com/yahoo/document/json/JsonWriterTestCase.java
+++ b/document/src/test/java/com/yahoo/document/json/JsonWriterTestCase.java
@@ -19,8 +19,10 @@ import com.yahoo.document.Field;
 import com.yahoo.document.MapDataType;
 import com.yahoo.document.PositionDataType;
 import com.yahoo.document.StructDataType;
+import com.yahoo.document.TensorDataType;
 import com.yahoo.document.WeightedSetDataType;
 import com.yahoo.document.datatypes.TensorFieldValue;
+import com.yahoo.tensor.TensorType;
 import com.yahoo.text.Utf8;
 import org.apache.commons.codec.binary.Base64;
 import org.junit.After;
@@ -40,7 +42,7 @@ import static org.junit.Assert.assertSame;
 /**
  * Functional tests for com.yahoo.document.json.JsonWriter.
  *
- * @author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
+ * @author Steinar Knutsen
  */
 public class JsonWriterTestCase {
 
@@ -115,7 +117,8 @@ public class JsonWriterTestCase {
         }
         {
             DocumentType x = new DocumentType("testtensor");
-            x.addField(new Field("tensorfield", DataType.TENSOR));
+            TensorType tensorType = new TensorType.Builder().mapped("x").mapped("y").build();
+            x.addField(new Field("tensorfield", new TensorDataType(tensorType)));
             types.registerDocumentType(x);
         }
     }
@@ -310,8 +313,7 @@ public class JsonWriterTestCase {
 
     @Test
     public void testWritingOfEmptyTensor() throws IOException {
-        assertTensorRoundTripEquality("{}",
-                "{ \"cells\": [] }");
+        assertTensorRoundTripEquality("{}", "{ \"cells\": [] }");
     }
 
     @Test
@@ -344,10 +346,11 @@ public class JsonWriterTestCase {
 
     @Test
     public void testWritingOfTensorFieldValueWithoutTensor() throws IOException {
-        DocumentType tensorType = types.getDocumentType("testtensor");
+        DocumentType documentTypeWithTensor = types.getDocumentType("testtensor");
         String docId = "id:unittest:testtensor::0";
-        Document doc = new Document(tensorType, docId);
-        doc.setFieldValue(tensorType.getField("tensorfield"), new TensorFieldValue());
+        Document doc = new Document(documentTypeWithTensor, docId);
+        Field tensorField = documentTypeWithTensor.getField("tensorfield");
+        doc.setFieldValue(tensorField, new TensorFieldValue(((TensorDataType)tensorField.getDataType()).getTensorType()));
         assertEqualJson(asDocument(docId, "{ \"tensorfield\": {} }"), JsonWriter.toByteArray(doc));
     }
 
diff --git a/document/src/test/java/com/yahoo/document/serialization/SerializationTestUtils.java b/document/src/test/java/com/yahoo/document/serialization/SerializationTestUtils.java
index f3987085e32..7e3fabc30fb 100644
--- a/document/src/test/java/com/yahoo/document/serialization/SerializationTestUtils.java
+++ b/document/src/test/java/com/yahoo/document/serialization/SerializationTestUtils.java
@@ -2,6 +2,7 @@
 package com.yahoo.document.serialization;
 
 import com.yahoo.document.Document;
+import com.yahoo.document.datatypes.TensorFieldValue;
 import com.yahoo.io.GrowableByteBuffer;
 
 import java.io.IOException;
diff --git a/document/src/test/java/com/yahoo/document/serialization/TensorFieldValueSerializationTestCase.java b/document/src/test/java/com/yahoo/document/serialization/TensorFieldValueSerializationTestCase.java
index 22cb35ae937..ae61bb3cf6f 100644
--- a/document/src/test/java/com/yahoo/document/serialization/TensorFieldValueSerializationTestCase.java
+++ b/document/src/test/java/com/yahoo/document/serialization/TensorFieldValueSerializationTestCase.java
@@ -4,8 +4,10 @@ package com.yahoo.document.serialization;
 import com.yahoo.document.DataType;
 import com.yahoo.document.Document;
 import com.yahoo.document.DocumentType;
+import com.yahoo.document.TensorDataType;
 import com.yahoo.document.datatypes.TensorFieldValue;
 import com.yahoo.tensor.Tensor;
+import com.yahoo.tensor.TensorType;
 import org.junit.Test;
 
 import java.io.IOException;
@@ -19,30 +21,31 @@ import static org.junit.Assert.assertEquals;
  */
 public class TensorFieldValueSerializationTestCase {
 
+    private final static TensorType tensorType = new TensorType.Builder().mapped("dimX").mapped("dimY").build();
     private final static String TENSOR_FIELD = "my_tensor";
     private final static String TENSOR_FILES = "src/test/resources/tensor/";
-    private final static TestDocumentFactory docFactory =
-            new TestDocumentFactory(createDocType(), "id:test:my_type::foo");
+    private final static TestDocumentFactory docFactory = new TestDocumentFactory(createDocType(), 
+                                                                                  "id:test:my_type::foo");
 
     private static DocumentType createDocType() {
         DocumentType type = new DocumentType("my_type");
-        type.addField(TENSOR_FIELD, DataType.TENSOR);
+        type.addField(TENSOR_FIELD, new TensorDataType(tensorType));
         return type;
     }
 
     @Test
     public void requireThatTensorFieldValueIsSerializedAndDeserialized() {
-        assertSerialization(new TensorFieldValue());
-        assertSerialization(createTensor("{}"));
-        assertSerialization(createTensor("{{dimX:a,dimY:bb}:2.0,{dimX:ccc,dimY:dddd}:3.0,{dimX:e,dimY:ff}:5.0}"));
+        assertSerialization(new TensorFieldValue(tensorType));
+        assertSerialization(createTensor(tensorType, "{}"));
+        assertSerialization(createTensor(tensorType, "{{dimX:a,dimY:bb}:2.0,{dimX:ccc,dimY:dddd}:3.0,{dimX:e,dimY:ff}:5.0}"));
     }
 
     @Test
     public void requireThatSerializationMatchesCpp() throws IOException {
-        assertSerializationMatchesCpp("non_existing_tensor", new TensorFieldValue());
-        assertSerializationMatchesCpp("empty_tensor", createTensor("{}"));
+        assertSerializationMatchesCpp("non_existing_tensor", new TensorFieldValue(tensorType));
+        assertSerializationMatchesCpp("empty_tensor", createTensor(tensorType, "{}"));
         assertSerializationMatchesCpp("multi_cell_tensor",
-                createTensor("{{dimX:a,dimY:bb}:2.0,{dimX:ccc,dimY:dddd}:3.0,{dimX:e,dimY:ff}:5.0}"));
+                createTensor(tensorType, "{{dimX:a,dimY:bb}:2.0,{dimX:ccc,dimY:dddd}:3.0,{dimX:e,dimY:ff}:5.0}"));
     }
 
     private static void assertSerialization(TensorFieldValue tensor) {
@@ -60,8 +63,8 @@ public class TensorFieldValueSerializationTestCase {
         SerializationTestUtils.assertSerializationMatchesCpp(TENSOR_FILES, fileName, document, docFactory);
     }
 
-    private static TensorFieldValue createTensor(String tensor) {
-        return new TensorFieldValue(Tensor.from(tensor));
+    private static TensorFieldValue createTensor(TensorType type, String tensorCellString) {
+        return new TensorFieldValue(Tensor.from(type, tensorCellString));
     }
 
 }
diff --git a/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlFieldReaderTestCase.java b/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlFieldReaderTestCase.java
index 3cfbcac5b62..3dc6ebd1403 100644
--- a/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlFieldReaderTestCase.java
+++ b/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlFieldReaderTestCase.java
@@ -12,6 +12,7 @@ import com.yahoo.document.predicate.FeatureRange;
 import com.yahoo.document.predicate.FeatureSet;
 import com.yahoo.document.predicate.Predicate;
 import com.yahoo.document.serialization.DeserializationException;
+import com.yahoo.tensor.TensorType;
 import org.apache.commons.codec.binary.Base64;
 import org.junit.Test;
 
@@ -75,8 +76,8 @@ public class VespaXmlFieldReaderTestCase {
 
     @Test
     public void requireThatPutsForTensorFieldsAreNotSupported() throws Exception {
-        assertThrows(new Field("my_tensor", DataType.TENSOR), "",
-                "Field 'my_tensor': XML input for fields of type TENSOR is not supported. Please use JSON input instead.");
+        assertThrows(new Field("my_tensor", new TensorDataType(TensorType.empty)), "",
+                     "Field 'my_tensor': XML input for fields of type TENSOR is not supported. Please use JSON input instead.");
     }
 
     private class MockedReaderFixture {
diff --git a/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlUpdateReaderTestCase.java b/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlUpdateReaderTestCase.java
index 8730265c80d..8a5fabde9ea 100644
--- a/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlUpdateReaderTestCase.java
+++ b/document/src/test/java/com/yahoo/vespaxmlparser/VespaXmlUpdateReaderTestCase.java
@@ -7,7 +7,9 @@ import com.yahoo.document.DocumentTypeManager;
 import com.yahoo.document.DocumentUpdate;
 import com.yahoo.document.Field;
 import com.yahoo.document.StructDataType;
+import com.yahoo.document.TensorDataType;
 import com.yahoo.document.serialization.DeserializationException;
+import com.yahoo.tensor.TensorType;
 import org.junit.Ignore;
 import org.junit.Test;
 
@@ -215,8 +217,8 @@ public class VespaXmlUpdateReaderTestCase {
 
     @Test
     public void requireThatUpdatesForTensorFieldsAreNotSupported() throws Exception {
-        assertThrows(new Field("my_tensor", DataType.TENSOR), "<assign field='my_tensor'></assign>",
-                "Field 'my_tensor': XML input for fields of type TENSOR is not supported. Please use JSON input instead.");
+        assertThrows(new Field("my_tensor", new TensorDataType(TensorType.empty)), "<assign field='my_tensor'></assign>",
+                     "Field 'my_tensor': XML input for fields of type TENSOR is not supported. Please use JSON input instead.");
     }
 
     private static void assertThrows(Field field, String fieldXml, String expected) throws Exception {
diff --git a/document/src/test/resources/tensor/empty_tensor__cpp b/document/src/test/resources/tensor/empty_tensor__cpp
index 365182b14eb..7915a6842e0 100644
--- a/document/src/test/resources/tensor/empty_tensor__cpp
+++ b/document/src/test/resources/tensor/empty_tensor__cpp
diff --git a/document/src/test/resources/tensor/empty_tensor__java b/document/src/test/resources/tensor/empty_tensor__java
index 365182b14eb..7915a6842e0 100644
--- a/document/src/test/resources/tensor/empty_tensor__java
+++ b/document/src/test/resources/tensor/empty_tensor__java
diff --git a/document/src/test/resources/tensor/multi_cell_tensor__cpp b/document/src/test/resources/tensor/multi_cell_tensor__cpp
index c0b2b3a165a..d34080b6b99 100644
--- a/document/src/test/resources/tensor/multi_cell_tensor__cpp
+++ b/document/src/test/resources/tensor/multi_cell_tensor__cpp
diff --git a/document/src/test/resources/tensor/multi_cell_tensor__java b/document/src/test/resources/tensor/multi_cell_tensor__java
index d923fc10559..d34080b6b99 100644
--- a/document/src/test/resources/tensor/multi_cell_tensor__java
+++ b/document/src/test/resources/tensor/multi_cell_tensor__java
diff --git a/document/src/test/resources/tensor/non_existing_tensor__cpp b/document/src/test/resources/tensor/non_existing_tensor__cpp
index 08cbcac6dd3..2c5746e19f3 100644
--- a/document/src/test/resources/tensor/non_existing_tensor__cpp
+++ b/document/src/test/resources/tensor/non_existing_tensor__cpp
diff --git a/document/src/test/resources/tensor/non_existing_tensor__java b/document/src/test/resources/tensor/non_existing_tensor__java
index 08cbcac6dd3..2c5746e19f3 100644
--- a/document/src/test/resources/tensor/non_existing_tensor__java
+++ b/document/src/test/resources/tensor/non_existing_tensor__java
diff --git a/vespajlib/src/main/java/com/yahoo/tensor/TensorType.java b/vespajlib/src/main/java/com/yahoo/tensor/TensorType.java
index 82f36972a47..e58a08c8d31 100644
--- a/vespajlib/src/main/java/com/yahoo/tensor/TensorType.java
+++ b/vespajlib/src/main/java/com/yahoo/tensor/TensorType.java
@@ -77,6 +77,25 @@ public class TensorType {
         return Optional.empty();
     }
 
+    /** 
+     * Returns whether a tensor of the given type can be assigned to this type,
+     * i.e of this type is a generalization of the given type.
+     */
+    public boolean isAssignableTo(TensorType other) {
+        if (other.dimensions().size() != this.dimensions().size()) return false;
+        for (int i = 0; i < other.dimensions().size(); i++) {
+            Dimension thisDimension = this.dimensions().get(i);
+            Dimension otherDimension = other.dimensions().get(i);
+            if (thisDimension.isIndexed() != other.isIndexed()) return false;
+            if ( ! thisDimension.name().equals(otherDimension.name())) return false;
+            if (thisDimension.size().isPresent()) {
+                if ( ! otherDimension.size().isPresent()) return false;
+                if (otherDimension.size().get() > thisDimension.size().get() ) return false;
+            }
+        }
+        return true;
+    }
+
     @Override
     public String toString() {
         return "tensor(" + dimensions.stream().map(Dimension::toString).collect(Collectors.joining(",")) + ")";
diff --git a/vespajlib/src/main/java/com/yahoo/tensor/serialization/TypedBinaryFormat.java b/vespajlib/src/main/java/com/yahoo/tensor/serialization/TypedBinaryFormat.java
index 5a45f20b6d8..5bb93b9da83 100644
--- a/vespajlib/src/main/java/com/yahoo/tensor/serialization/TypedBinaryFormat.java
+++ b/vespajlib/src/main/java/com/yahoo/tensor/serialization/TypedBinaryFormat.java
@@ -4,6 +4,7 @@ package com.yahoo.tensor.serialization;
 import com.google.common.annotations.Beta;
 import com.yahoo.io.GrowableByteBuffer;
 import com.yahoo.tensor.Tensor;
+import com.yahoo.tensor.TensorType;
 
 /**
  * Class used by clients for serializing a Tensor object into binary format or
diff --git a/vespajlib/src/main/java/com/yahoo/vespa/objects/Identifiable.java b/vespajlib/src/main/java/com/yahoo/vespa/objects/Identifiable.java
index e0edc6f4e64..d303a69a68d 100644
--- a/vespajlib/src/main/java/com/yahoo/vespa/objects/Identifiable.java
+++ b/vespajlib/src/main/java/com/yahoo/vespa/objects/Identifiable.java
@@ -16,7 +16,7 @@ import java.util.HashMap;
  * methods.
  *
  * @author baldersheim
- * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ * @author Simon Thoresen
  */
 public class Identifiable extends Selectable implements Cloneable {
 
@@ -177,7 +177,7 @@ public class Identifiable extends Selectable implements Cloneable {
      *
      * @param id   The class identifier to register with.
      * @param spec The class to register.
-     * @return The identifier argument.
+     * @return the identifier argument.
      */
     protected static int registerClass(int id, Class<? extends Identifiable> spec) {
         if (registry == null) {
diff --git a/vespajlib/src/test/java/com/yahoo/tensor/serialization/SparseBinaryFormatTestCase.java b/vespajlib/src/test/java/com/yahoo/tensor/serialization/SparseBinaryFormatTestCase.java
index ad908101329..8f96edf7dd8 100644
--- a/vespajlib/src/test/java/com/yahoo/tensor/serialization/SparseBinaryFormatTestCase.java
+++ b/vespajlib/src/test/java/com/yahoo/tensor/serialization/SparseBinaryFormatTestCase.java
@@ -32,7 +32,7 @@ public class SparseBinaryFormatTestCase {
 
     private static void assertSerialization(Tensor tensor) {
         byte[] encodedTensor = TypedBinaryFormat.encode(tensor);
-        Tensor decodedTensor = TypedBinaryFormat.decode(encodedTensor);
+        Tensor decodedTensor = TypedBinaryFormat.decode(null, encodedTensor);
         assertEquals(tensor, decodedTensor);
     }