From fb88c0221da66bdcaabeaa9c7d7950dc9b5ceb76 Mon Sep 17 00:00:00 2001
From: Cameron Thornton <camthornton@google.com>
Date: Tue, 19 Jul 2022 15:59:55 -0500
Subject: [PATCH] Remove collation from update request and make collation
 non-updatable (#6298)

---
 .../resource_sql_database_instance.go.erb     |  4 +++
 ...resource_sql_database_instance_test.go.erb | 27 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/mmv1/third_party/terraform/resources/resource_sql_database_instance.go.erb b/mmv1/third_party/terraform/resources/resource_sql_database_instance.go.erb
index ae6f9e24ca55..92841d9e1761 100644
--- a/mmv1/third_party/terraform/resources/resource_sql_database_instance.go.erb
+++ b/mmv1/third_party/terraform/resources/resource_sql_database_instance.go.erb
@@ -268,6 +268,7 @@ is set to true.`,
 						"collation": {
 							Type:             schema.TypeString,
 							Optional:         true,
+							ForceNew:         true,
 							Description:      `The name of server instance collation.`,
 						},
 						"database_flags": {
@@ -1307,6 +1308,9 @@ func resourceSqlDatabaseInstanceUpdate(d *schema.ResourceData, meta interface{})
 		Settings: expandSqlDatabaseInstanceSettings(d.Get("settings").([]interface{})),
 	}
 
+	// Collation cannot be included in the update request
+	instance.Settings.Collation = ""
+
 	// Lock on the master_instance_name just in case updating any replica
 	// settings causes operations on the master.
 	if v, ok := d.GetOk("master_instance_name"); ok {
diff --git a/mmv1/third_party/terraform/tests/resource_sql_database_instance_test.go.erb b/mmv1/third_party/terraform/tests/resource_sql_database_instance_test.go.erb
index 487f01a19b9e..af2e92b5a56d 100644
--- a/mmv1/third_party/terraform/tests/resource_sql_database_instance_test.go.erb
+++ b/mmv1/third_party/terraform/tests/resource_sql_database_instance_test.go.erb
@@ -223,6 +223,16 @@ func TestAccSqlDatabaseInstance_basicMSSQL(t *testing.T) {
 				ImportStateVerify: true,
 				ImportStateVerifyIgnore: []string{"root_password", "deletion_protection"},
 			},
+			{
+				Config: fmt.Sprintf(
+					testGoogleSqlDatabaseInstance_update_mssql, databaseName, rootPassword),
+			},
+			{
+				ResourceName:            "google_sql_database_instance.instance",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"root_password", "deletion_protection"},
+			},
 		},
 	})
 }
@@ -1223,6 +1233,23 @@ resource "google_sql_database_instance" "instance" {
 }
 `
 
+var testGoogleSqlDatabaseInstance_update_mssql = `
+resource "google_sql_database_instance" "instance" {
+  name                = "%s"
+  database_version    = "SQLSERVER_2019_STANDARD"
+  root_password       = "%s"
+  deletion_protection = false
+  settings {
+    tier = "db-custom-1-3840"
+    collation = "Polish_CI_AS"
+    ip_configuration {
+      ipv4_enabled = true
+      require_ssl = true
+    }
+  }
+}
+`
+
 func testGoogleSqlDatabaseInstance_ActiveDirectoryConfig(databaseName, networkName, addressRangeName, rootPassword, adDomainName string) string {
 	return fmt.Sprintf(`
 data "google_compute_network" "servicenet" {