Added terraform support to configure SMT in SQL Server instances

.changelog/7881.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+sql: added `advanced_machine_features` field in `google_sql_database_instance`
+```

google-beta/resource_sql_database_instance.go

@@ -153,6 +153,20 @@ func ResourceSqlDatabaseInstance() *schema.Resource {
 							Required:    true,
 							Description: `The machine type to use. See tiers for more details and supported versions. Postgres supports only shared-core machine types, and custom machine types such as db-custom-2-13312. See the Custom Machine Type Documentation to learn about specifying custom machine types.`,
 						},
+						"advanced_machine_features": {
+							Type:     schema.TypeList,
+							Optional: true,
+							MaxItems: 1,
+							Elem: &schema.Resource{
+								Schema: map[string]*schema.Schema{
+									"threads_per_core": {
+										Type:        schema.TypeInt,
+										Optional:    true,
+										Description: `The number of threads per physical core. Can be 1 or 2.`,
+									},
+								},
+							},
+						},
 						"activation_policy": {
 							Type:        schema.TypeString,
 							Optional:    true,
@@ -1150,6 +1164,7 @@ func expandSqlDatabaseInstanceSettings(configured []interface{}, databaseVersion
 		// Version is unset in Create but is set during update
 		SettingsVersion:           int64(_settings["version"].(int)),
 		Tier:                      _settings["tier"].(string),
+		AdvancedMachineFeatures:   expandSqlServerAdvancedMachineFeatures(_settings["advanced_machine_features"].([]interface{})),
 		ForceSendFields:           []string{"StorageAutoResize"},
 		ActivationPolicy:          _settings["activation_policy"].(string),
 		ActiveDirectoryConfig:     expandActiveDirectoryConfig(_settings["active_directory_config"].([]interface{})),
@@ -1368,6 +1383,18 @@ func expandDenyMaintenancePeriod(configured []interface{}) []*sqladmin.DenyMaint
 
 }
 
+func expandSqlServerAdvancedMachineFeatures(configured interface{}) *sqladmin.AdvancedMachineFeatures {
+	l := configured.([]interface{})
+	if len(l) == 0 {
+		return nil
+	}
+
+	config := l[0].(map[string]interface{})
+	return &sqladmin.AdvancedMachineFeatures{
+		ThreadsPerCore: int64(config["threads_per_core"].(int)),
+	}
+}
+
 func expandSqlServerAuditConfig(configured interface{}) *sqladmin.SqlServerAuditConfig {
 	l := configured.([]interface{})
 	if len(l) == 0 {
@@ -1885,6 +1912,10 @@ func flattenSettings(settings *sqladmin.Settings) []map[string]interface{} {
 		data["password_validation_policy"] = flattenPasswordValidationPolicy(settings.PasswordValidationPolicy)
 	}
 
+	if settings.AdvancedMachineFeatures != nil {
+		data["advanced_machine_features"] = flattenSqlServerAdvancedMachineFeatures(settings.AdvancedMachineFeatures)
+	}
+
 	return []map[string]interface{}{data}
 }
 
@@ -1941,6 +1972,17 @@ func flattenDenyMaintenancePeriod(denyMaintenancePeriod []*sqladmin.DenyMaintena
 	return flags
 }
 
+func flattenSqlServerAdvancedMachineFeatures(advancedMachineFeatures *sqladmin.AdvancedMachineFeatures) []map[string]interface{} {
+	if advancedMachineFeatures == nil {
+		return nil
+	}
+	return []map[string]interface{}{
+		{
+			"threads_per_core": advancedMachineFeatures.ThreadsPerCore,
+		},
+	}
+}
+
 func flattenSqlServerAuditConfig(sqlServerAuditConfig *sqladmin.SqlServerAuditConfig) []map[string]interface{} {
 	if sqlServerAuditConfig == nil {
 		return nil

google-beta/resource_sql_database_instance_test.go

@@ -1405,6 +1405,48 @@ func TestAccSqlDatabaseInstance_SqlServerAuditOptionalBucket(t *testing.T) {
 	})
 }
 
+func TestAccSqlDatabaseInstance_Smt(t *testing.T) {
+	t.Parallel()
+
+	databaseName := "tf-test-" + RandString(t, 10)
+	rootPassword := RandString(t, 15)
+
+	VcrTest(t, resource.TestCase{
+		PreCheck:                 func() { AccTestPreCheck(t) },
+		ProtoV5ProviderFactories: ProtoV5ProviderFactories(t),
+		CheckDestroy:             testAccSqlDatabaseInstanceDestroyProducer(t),
+		Steps: []resource.TestStep{
+			{
+				Config: testGoogleSqlDatabaseInstance_Smt(databaseName, rootPassword, 1),
+			},
+			{
+				ResourceName:            "google_sql_database_instance.instance",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"root_password", "deletion_protection"},
+			},
+			{
+				Config: testGoogleSqlDatabaseInstance_Smt(databaseName, rootPassword, 2),
+			},
+			{
+				ResourceName:            "google_sql_database_instance.instance",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"root_password", "deletion_protection"},
+			},
+			{
+				Config: testGoogleSqlDatabaseInstance_NullSmt(databaseName, rootPassword),
+			},
+			{
+				ResourceName:            "google_sql_database_instance.instance",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"root_password", "deletion_protection"},
+			},
+		},
+	})
+}
+
 func TestAccSqlDatabaseInstance_Timezone(t *testing.T) {
 	t.Parallel()
 
@@ -2006,6 +2048,47 @@ resource "google_sql_database_instance" "instance" {
 `, databaseName, rootPassword, retentionInterval, uploadInterval)
 }
 
+func testGoogleSqlDatabaseInstance_NullSmt(databaseName, rootPassword string) string {
+	return fmt.Sprintf(`
+resource "google_sql_database_instance" "instance" {
+  name             = "%s"
+  region           = "us-central1"
+  database_version = "SQLSERVER_2017_STANDARD"
+  root_password    = "%s"
+  deletion_protection = false
+  settings {
+    tier = "db-custom-8-53248"
+    ip_configuration {
+      ipv4_enabled       = "true"
+    }
+    advanced_machine_features {
+    }
+  }
+}
+`, databaseName, rootPassword)
+}
+
+func testGoogleSqlDatabaseInstance_Smt(databaseName, rootPassword string, threadsPerCore int) string {
+	return fmt.Sprintf(`
+resource "google_sql_database_instance" "instance" {
+  name             = "%s"
+  region           = "us-central1"
+  database_version = "SQLSERVER_2017_STANDARD"
+  root_password    = "%s"
+  deletion_protection = false
+  settings {
+    tier = "db-custom-8-53248"
+    ip_configuration {
+      ipv4_enabled       = "true"
+    }
+    advanced_machine_features {
+      threads_per_core = "%d"
+    }
+  }
+}
+`, databaseName, rootPassword, threadsPerCore)
+}
+
 func testGoogleSqlDatabaseInstance_Timezone(databaseName, rootPassword, timezone string) string {
 	return fmt.Sprintf(`
 resource "google_sql_database_instance" "instance" {

website/docs/r/sql_database_instance.html.markdown

@@ -228,6 +228,10 @@ The `settings` block supports:
     for more details and supported versions. Postgres supports only shared-core machine types,
     and custom machine types such as `db-custom-2-13312`. See the [Custom Machine Type Documentation](https://cloud.google.com/compute/docs/instances/creating-instance-with-custom-machine-type#create) to learn about specifying custom machine types.
 
+The optional `settings.advanced_machine_features` subblock supports:
+
+* `threads_per_core` - (Optional) The number of threads per core. The value of this flag can be 1 or 2. To disable SMT, set this flag to 1. Only available in Cloud SQL for SQL Server instances. See [smt](https://cloud.google.com/sql/docs/sqlserver/create-instance#smt-create-instance) for more details.
+
 * `activation_policy` - (Optional) This specifies when the instance should be
     active. Can be either `ALWAYS`, `NEVER` or `ON_DEMAND`.