Update documentation and add test case for data cache setting as it is available for postgres now

mmv1/third_party/terraform/services/sql/resource_sql_database_instance_test.go

@@ -1573,6 +1573,38 @@ func TestAccSQLDatabaseInstance_sqlMysqlDataCacheConfig(t *testing.T) {
 	})
 }
 
+func TestAccSQLDatabaseInstance_sqlPostgresDataCacheConfig(t *testing.T) {
+	t.Parallel()
+	enterprisePlusInstanceName := "tf-test-enterprise-plus" + acctest.RandString(t, 10)
+	enterprisePlusTier := "db-perf-optimized-N-2"
+	enterpriseInstanceName := "tf-test-enterprise-" + acctest.RandString(t, 10)
+	enterpriseTier := "db-custom-2-13312"
+	acctest.VcrTest(t, resource.TestCase{
+		PreCheck:                 func() { acctest.AccTestPreCheck(t) },
+		ProtoV5ProviderFactories: acctest.ProtoV5ProviderFactories(t),
+		CheckDestroy:             testAccSqlDatabaseInstanceDestroyProducer(t),
+		Steps: []resource.TestStep{
+			{
+				Config: testGoogleSqlDatabaseInstance_sqlPostgresDataCacheConfig(enterprisePlusInstanceName, enterprisePlusTier, "ENTERPRISE_PLUS"),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckResourceAttr("google_sql_database_instance.instance", "settings.0.data_cache_config.0.data_cache_enabled", "true"),
+				),
+			},
+			{
+				ResourceName:            "google_sql_database_instance.instance",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"deletion_protection"},
+			},
+			{
+				Config: testGoogleSqlDatabaseInstance_sqlPostgresDataCacheConfig(enterpriseInstanceName, enterpriseTier, "ENTERPRISE"),
+				ExpectError: regexp.MustCompile(
+					fmt.Sprintf("Error, failed to create instance %s: googleapi: Error 400: Invalid request: Only ENTERPRISE PLUS edition supports data cache.., invalid", enterpriseInstanceName)),
+			},
+		},
+	})
+}
+
 func TestAccSqlDatabaseInstance_SqlServerAuditConfig(t *testing.T) {
 	// Service Networking
 	acctest.SkipIfVcr(t)
@@ -2363,6 +2395,24 @@ resource "google_sql_database_instance" "instance" {
 }`, instanceName)
 }
 
+func testGoogleSqlDatabaseInstance_sqlPostgresDataCacheConfig(instanceName, tier, edition string) string {
+	return fmt.Sprintf(`
+
+resource "google_sql_database_instance" "instance" {
+  name             = "%s"
+  region           = "us-east1"
+  database_version    = "POSTGRES_14"
+  deletion_protection = false
+  settings {
+    tier = "%s"
+    edition = "%s"
+    data_cache_config {
+        data_cache_enabled = true
+    }
+  }
+}`, instanceName, tier, edition)
+}
+
 func testGoogleSqlDatabaseInstance_SqlServerAuditConfig(databaseName, rootPassword, bucketName, uploadInterval, retentionInterval string) string {
 	return fmt.Sprintf(`
 resource "google_storage_bucket" "gs-bucket" {

mmv1/third_party/terraform/website/docs/r/sql_database_instance.html.markdown

@@ -317,8 +317,7 @@ The optional `settings.active_directory_config` subblock supports:
 
 The optional `settings.data_cache_config` subblock supports:
 
-* `data_cache_enabled` - (Optional) Whether data cache is enabled for the instance. Defaults to `false`
-    Can only be used with MYSQL.
+* `data_cache_enabled` - (Optional) Whether data cache is enabled for the instance. Defaults to `false`. Can be used with MYSQL and PostgreSQL only.
 
 The optional `settings.deny_maintenance_period` subblock supports: