Fixed printing the tasks in job output in DAG execution order (#377)

Fixes #259

## Changes
Sort task output in an execution order based on task end time

## Tests
Added `TestTaskJobOutputOrderToString` unit test.

bundle/run/output/job.go

@@ -8,15 +8,20 @@ import (
 
 	"github.com/databricks/databricks-sdk-go"
 	"github.com/databricks/databricks-sdk-go/service/jobs"
-	"golang.org/x/exp/maps"
 )
 
+type TaskOutput struct {
+	TaskKey string
+	Output  RunOutput
+	EndTime int64
+}
+
 type JobOutput struct {
 	// output for tasks with a non empty output
-	TaskOutputs map[string]RunOutput `json:"task_outputs"`
+	TaskOutputs []TaskOutput `json:"task_outputs"`
 }
 
-// TODO: Print the output respecting the execution order (https://github.com/databricks/bricks/issues/259)
+// Returns tasks output in text form sorted in execution order based on task end time
 func (out *JobOutput) String() (string, error) {
 	if len(out.TaskOutputs) == 0 {
 		return "", nil
@@ -24,24 +29,24 @@ func (out *JobOutput) String() (string, error) {
 	// When only one task, just return that output without any formatting
 	if len(out.TaskOutputs) == 1 {
 		for _, v := range out.TaskOutputs {
-			return v.String()
+			return v.Output.String()
 		}
 	}
 	result := strings.Builder{}
 	result.WriteString("Output:\n")
-
-	taskKeys := maps.Keys(out.TaskOutputs)
-	sort.Strings(taskKeys)
-	for _, k := range taskKeys {
-		if out.TaskOutputs[k] == nil {
+	sort.Slice(out.TaskOutputs, func(i, j int) bool {
+		return out.TaskOutputs[i].EndTime < out.TaskOutputs[j].EndTime
+	})
+	for _, v := range out.TaskOutputs {
+		if v.Output == nil {
 			continue
 		}
-		taskString, err := out.TaskOutputs[k].String()
+		taskString, err := v.Output.String()
 		if err != nil {
 			return "", nil
 		}
 		result.WriteString("=======\n")
-		result.WriteString(fmt.Sprintf("Task %s:\n", k))
+		result.WriteString(fmt.Sprintf("Task %s:\n", v.TaskKey))
 		result.WriteString(fmt.Sprintf("%s\n", taskString))
 	}
 	return result.String(), nil
@@ -55,7 +60,7 @@ func GetJobOutput(ctx context.Context, w *databricks.WorkspaceClient, runId int6
 		return nil, err
 	}
 	result := &JobOutput{
-		TaskOutputs: make(map[string]RunOutput),
+		TaskOutputs: make([]TaskOutput, len(jobRun.Tasks)),
 	}
 	for _, task := range jobRun.Tasks {
 		jobRunOutput, err := w.Jobs.GetRunOutput(ctx, jobs.GetRunOutputRequest{
@@ -64,7 +69,8 @@ func GetJobOutput(ctx context.Context, w *databricks.WorkspaceClient, runId int6
 		if err != nil {
 			return nil, err
 		}
-		result.TaskOutputs[task.TaskKey] = toRunOutput(jobRunOutput)
+		task := TaskOutput{TaskKey: task.TaskKey, Output: toRunOutput(jobRunOutput), EndTime: task.EndTime}
+		result.TaskOutputs = append(result.TaskOutputs, task)
 	}
 	return result, nil
 }

bundle/run/output/job_test.go

@@ -14,8 +14,8 @@ func TestSingleTaskJobOutputToString(t *testing.T) {
 		Truncated: true,
 	}
 	myJob := JobOutput{
-		TaskOutputs: map[string]RunOutput{
-			"my_notebook_task": &taskNotebook,
+		TaskOutputs: []TaskOutput{
+			{TaskKey: "my_notebook_task", Output: &taskNotebook, EndTime: 0},
 		},
 	}
 
@@ -35,9 +35,9 @@ func TestMultiTaskJobOutputToString(t *testing.T) {
 		LogsTruncated: false,
 	}
 	myJob := JobOutput{
-		TaskOutputs: map[string]RunOutput{
-			"my_foo_task": &taskFoo,
-			"my_bar_task": &taskBar,
+		TaskOutputs: []TaskOutput{
+			{TaskKey: "my_bar_task", Output: &taskBar, EndTime: 0},
+			{TaskKey: "my_foo_task", Output: &taskFoo, EndTime: 0},
 		},
 	}
 
@@ -57,6 +57,41 @@ foo
 	assert.Equal(t, expected, actual)
 }
 
+func TestTaskJobOutputOrderToString(t *testing.T) {
+	taskFoo := NotebookOutput{
+		Result: "foo",
+	}
+	taskBar := LogsOutput{
+		Logs: "bar",
+	}
+	taskBaz := LogsOutput{
+		Logs: "baz",
+	}
+	myJob := JobOutput{
+		TaskOutputs: []TaskOutput{
+			{TaskKey: "my_baz_task", Output: &taskBaz, EndTime: 1683553233331},
+			{TaskKey: "my_bar_task", Output: &taskBar, EndTime: 1683553223508},
+			{TaskKey: "my_foo_task", Output: &taskFoo, EndTime: 1683553217598},
+		},
+	}
+
+	actual, err := myJob.String()
+	require.NoError(t, err)
+
+	expected := `Output:
+=======
+Task my_foo_task:
+foo
+=======
+Task my_bar_task:
+bar
+=======
+Task my_baz_task:
+baz
+`
+	assert.Equal(t, expected, actual)
+}
+
 func TestNotebookOutputToRunOutput(t *testing.T) {
 	jobOutput := &jobs.RunOutput{
 		NotebookOutput: &jobs.NotebookOutput{