fix(cloud): cloud backend rendering query warning diags (#38040)

.changes/v1.14/BUG FIXES-20260108-114527.yaml

@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: Fixes an issue where any warning diagnostics generated during terraform query execution failed to render in the cloud backend session
+time: 2026-01-08T11:45:27.489784-08:00
+custom:
+    Issue: "38040"

internal/cloud/backend_query.go

@@ -169,6 +169,11 @@ func (b *Cloud) renderQueryRunLogs(ctx context.Context, op *backendrun.Operation
 						if result.Len() > 0 {
 							b.renderer.Streams.Println(result.String())
 						}
+					default:
+						err := b.renderer.RenderLog(log)
+						if err != nil {
+							return err
+						}
 					}
 				}
 			}

internal/cloud/backend_query_test.go

@@ -139,3 +139,42 @@ list.concept_pet.pets   id=legal-lamprey,legs=2     This is a legal-lamprey
 		t.Fatalf("unexpected error locking state after successful plan: %s", err.Error())
 	}
 }
+
+func TestCloud_queryJSONWithDiags(t *testing.T) {
+	b, bCleanup := testBackendWithName(t)
+	defer bCleanup()
+
+	stream, close := terminal.StreamsForTesting(t)
+
+	b.renderer = &jsonformat.Renderer{
+		Streams:  stream,
+		Colorize: mockColorize(),
+	}
+
+	op, configCleanup, done := testOperationQuery(t, "./testdata/query-json-diag")
+	defer configCleanup()
+	defer done(t)
+
+	op.Workspace = testBackendSingleWorkspaceName
+
+	mockSROWorkspace(t, b, op.Workspace)
+
+	run, err := b.Operation(context.Background(), op)
+	if err != nil {
+		t.Fatalf("error starting operation: %v", err)
+	}
+
+	<-run.Done()
+	if run.Result != backendrun.OperationSuccess {
+		t.Fatalf("operation failed: %s", b.CLI.(*cli.MockUi).ErrorWriter.String())
+	}
+
+	testOut := close(t)
+	output := testOut.Stdout()
+
+	// Warning diagnostic message
+	testString := "Warning: Something went wrong"
+	if !strings.Contains(output, testString) {
+		t.Fatalf("Expected %q to contain %q but it did not", output, testString)
+	}
+}

internal/cloud/testdata/query-json-diag/main.tf

@@ -0,0 +1 @@
+resource "null_resource" "foo" {}

internal/cloud/testdata/query-json-diag/main.tfquery.hcl

@@ -0,0 +1,3 @@
+list "concept_pet" "pets" {
+  provider = concept
+}

internal/cloud/testdata/query-json-diag/query.log

@@ -0,0 +1,9 @@
+{"@level":"info","@message":"Terraform 1.14.0-dev","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.859531+02:00","terraform":"1.14.0-dev","type":"version","ui":"1.2"}
+{"@level":"info","@message":"list.concept_pet.pets: Starting query...","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.954999+02:00","list_start":{"address":"list.concept_pet.pets","resource_type":"concept_pet"},"type":"list_start"}
+{"@level":"info","@message":"list.concept_pet.pets: Result found","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955489+02:00","list_resource_found":{"address":"list.concept_pet.pets","display_name":"This is a large-roughy","identity":{"id":"large-roughy","legs":2},"resource_type":"concept_pet"},"type":"list_resource_found"}
+{"@level":"info","@message":"list.concept_pet.pets: Result found","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955516+02:00","list_resource_found":{"address":"list.concept_pet.pets","display_name":"This is a able-werewolf","identity":{"id":"able-werewolf","legs":5},"resource_type":"concept_pet"},"type":"list_resource_found"}
+{"@level":"info","@message":"list.concept_pet.pets: Result found","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955523+02:00","list_resource_found":{"address":"list.concept_pet.pets","display_name":"This is a complete-gannet","identity":{"id":"complete-gannet","legs":6},"resource_type":"concept_pet"},"type":"list_resource_found"}
+{"@level":"info","@message":"list.concept_pet.pets: Result found","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955529+02:00","list_resource_found":{"address":"list.concept_pet.pets","display_name":"This is a charming-beagle","identity":{"id":"charming-beagle","legs":3},"resource_type":"concept_pet"},"type":"list_resource_found"}
+{"@level":"info","@message":"list.concept_pet.pets: Result found","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955535+02:00","list_resource_found":{"address":"list.concept_pet.pets","display_name":"This is a legal-lamprey","identity":{"id":"legal-lamprey","legs":2},"resource_type":"concept_pet"},"type":"list_resource_found"}
+{"@level":"info","@message":"list.concept_pet.pets: List complete","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955538+02:00","list_complete":{"address":"list.concept_pet.pets","resource_type":"concept_pet","total":5},"type":"list_complete"}
+{"@level":"warn","@message":"Warning: Something went wrong","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955540+02:00","diagnostic":{"severity":"warning","summary":"Warning: Something went wrong","detail":"detail"},"type":"diagnostic"}