Describe collection by collection ID (#9471)

Signed-off-by: Ndragondriver <jiquan.long@zilliz.com>

internal/proxy/task.go

@@ -2636,10 +2636,11 @@ func (dct *describeCollectionTask) PreExecute(ctx context.Context) error {
 	dct.Base.MsgType = commonpb.MsgType_DescribeCollection
 	dct.Base.SourceID = Params.ProxyID
 
-	if err := ValidateCollectionName(dct.CollectionName); err != nil {
-		return err
+	if dct.CollectionID != 0 && len(dct.CollectionName) == 0 {
+		return nil
 	}
-	return nil
+
+	return ValidateCollectionName(dct.CollectionName)
 }
 
 func (dct *describeCollectionTask) Execute(ctx context.Context) error {

internal/proxy/task_test.go

@@ -1311,7 +1311,14 @@ func TestDescribeCollectionTask(t *testing.T) {
 	err = task.PreExecute(ctx)
 	assert.NotNil(t, err)
 
+	// describe collection with id
+	task.CollectionID = 1
+	task.CollectionName = ""
+	err = task.PreExecute(ctx)
+	assert.NoError(t, err)
+
 	rc.Stop()
+	task.CollectionID = 0
 	task.CollectionName = collectionName
 	err = task.PreExecute(ctx)
 	assert.Nil(t, err)