Fix v2 show if result is empty

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Changelog
 
+## v0.3.1-alpha
+* Fix v2 show result if empty result.
+
 ## v0.3.0-alpha
 * Deprecated metadata json format.
 * Removed `TransactionAsyncMetadataResponse` model.

rai/client.go

@@ -283,7 +283,6 @@ func unmarshal(rsp *http.Response, result interface{}) error {
 	switch data.(type) {
 
 	case []byte: // Got back a JSON response
-
 		if dstValues.Type() == reflect.TypeOf(TransactionAsyncResult{}) {
 			// But the user asked for the whole TransactionResult struct,
 			// so we need to parse the JSON TransactionResponse, and fill it in
@@ -311,24 +310,30 @@ func unmarshal(rsp *http.Response, result interface{}) error {
 	case []TransactionAsyncFile: // Multipart response
 		if dstValues.Type() == reflect.TypeOf(TransactionAsyncResult{}) {
 			rsp, err := readTransactionAsyncFiles(data.([]TransactionAsyncFile))
+			if err != nil {
+				return err
+			}
 			rsp.GotCompleteResult = true
 			srcValues := reflect.ValueOf(*rsp)
 			dstValues.Set(srcValues)
-			return err
+			return nil
 		}
 
 		if dstValues.Type() == reflect.TypeOf([]ArrowRelation{}) {
 			rsp, err := readArrowFiles(data.([]TransactionAsyncFile))
+			if err != nil {
+				return err
+			}
 			srcValues := reflect.ValueOf(rsp)
 			dstValues.Set(srcValues)
-			return err
+			return nil
 		}
 
 		return errors.Errorf("unhandled unmarshal type %T", result)
 	case generated.MetadataInfo:
 		srcValues := reflect.ValueOf(data)
 		dstValues.Set(srcValues)
-		return err
+		return nil
 	default:
 		return errors.Errorf("unsupported result type %T", reflect.TypeOf(data))
 	}
@@ -514,10 +519,6 @@ func readTransactionAsyncFiles(files []TransactionAsyncFile) (*TransactionAsyncR
 		return nil, errors.Errorf("transaction part is missing")
 	}
 
-	if len(metadata.Relations) == 0 {
-		return nil, errors.Errorf("metadata.proto is empty")
-	}
-
 	if problems == nil {
 		return nil, errors.Errorf("problems part is missing")
 	}

rai/metadata.pb

@@ -2,8 +2,8 @@
 >
 3
 "
-

-�
output
+

+�
output
 

 

 


rai/metadata.pb.txt

@@ -5,11 +5,11 @@ relations {
       constant_type {
         rel_type {
           tag: PRIMITIVE_TYPE
-          primitive_type: SYMBOL
+          primitive_type: STRING
         }
         value {
           arguments {
-            tag: SYMBOL
+            tag: STRING
             string_val: "output"
           }
         }

rai/show.go

@@ -148,6 +148,12 @@ func (tx *TransactionAsyncResult) ShowIO(io io.Writer) {
 		k := r.RelationID
 		v := r.Table
 		fmt.Fprintf(io, "%s\n", k)
+
+		if len(v) == 0 {
+			fmt.Fprintln(io, "()")
+			continue
+		}
+
 		iter := zip(v...)
 		for tuple := iter(); tuple != nil; tuple = iter() {
 			for i, element := range tuple {