fix: increase performance of ListUser by login name ignore case (#12350)

# Which Problems Are Solved

Login v2 uses the `users.v2.ListUsers`-endpoint to get a user by login
name. This query had an inefficient `WHERE`-clause.

# How the Problems Are Solved

Update the view and use a specific clause for this query.

# Additional information

Added in https://github.com/zitadel/zitadel/pull/10475

---------

Co-authored-by: Marco A. <[email protected]>
Co-authored-by: Livio Spring <[email protected]>

cmd/setup/72.go

@@ -0,0 +1,27 @@
+package setup
+
+import (
+	"context"
+	_ "embed"
+
+	"github.com/zitadel/zitadel/internal/database"
+	"github.com/zitadel/zitadel/internal/eventstore"
+)
+
+var (
+	//go:embed 72.sql
+	addColumnsToLoginNamesView string
+)
+
+type AddColumnsToLoginNamesView struct {
+	dbClient *database.DB
+}
+
+func (mig *AddColumnsToLoginNamesView) Execute(ctx context.Context, _ eventstore.Event) error {
+	_, err := mig.dbClient.ExecContext(ctx, addColumnsToLoginNamesView)
+	return err
+}
+
+func (mig *AddColumnsToLoginNamesView) String() string {
+	return "72_add_columns_to_login_names_view"
+}

cmd/setup/72.sql

@@ -0,0 +1,42 @@
+CREATE OR REPLACE VIEW projections.login_names3 AS (
+    SELECT
+        u.id AS user_id
+        , CASE
+            WHEN p.must_be_domain THEN CONCAT(u.user_name, '@', d.name)
+            ELSE u.user_name
+        END AS login_name
+        , COALESCE(d.is_primary, TRUE) AS is_primary
+        , u.instance_id
+        , u.resource_owner
+        , CASE
+                WHEN p.must_be_domain THEN CONCAT(u.user_name_lower, '@', d.name_lower)
+                ELSE u.user_name_lower
+        END AS login_name_lower
+    FROM
+        projections.login_names3_users AS u
+    LEFT JOIN LATERAL (
+        SELECT
+            must_be_domain
+            , is_default
+        FROM
+            projections.login_names3_policies AS p
+        WHERE
+            (
+                p.instance_id = u.instance_id
+                AND NOT p.is_default
+                AND p.resource_owner = u.resource_owner
+            ) OR (
+                p.instance_id = u.instance_id
+                AND p.is_default
+            )
+        ORDER BY
+            p.is_default -- custom first
+        LIMIT 1
+    ) AS p ON TRUE
+    LEFT JOIN 
+        projections.login_names3_domains d
+        ON 
+            p.must_be_domain 
+            AND u.resource_owner = d.resource_owner 
+            AND u.instance_id = d.instance_id
+);

cmd/setup/config.go

@@ -191,6 +191,7 @@ type Steps struct {
 	s69CacheTablesLogged                    *CacheTablesLogged
 	s70AddEventStoreCommandEnforceOwner     *AddEventStoreCommandEnforceOwnerColumn
 	s71JWTProvideAddAudienceColumn          *JWTProvideAddAudienceColumn
+	s72AddColumnsToLoginNamesView           *AddColumnsToLoginNamesView
 	RelationalTables                        *TransactionalTables
 }
 

cmd/setup/setup.go

@@ -254,6 +254,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 	steps.s69CacheTablesLogged = &CacheTablesLogged{dbClient: dbClient}
 	steps.s70AddEventStoreCommandEnforceOwner = &AddEventStoreCommandEnforceOwnerColumn{dbClient: dbClient}
 	steps.s71JWTProvideAddAudienceColumn = &JWTProvideAddAudienceColumn{dbClient: dbClient}
+	steps.s72AddColumnsToLoginNamesView = &AddColumnsToLoginNamesView{dbClient: dbClient}
 
 	err = projection.Create(ctx, dbClient, eventstoreClient, config.Projections, nil, nil, nil)
 	if err != nil {
@@ -378,6 +379,7 @@ func Setup(ctx context.Context, config *Config, steps *Steps, masterKey string)
 		steps.s66SessionRecoveryCodeCheckedAt,
 		steps.s68TargetAddPayloadTypeColumn,
 		steps.s71JWTProvideAddAudienceColumn,
+		steps.s72AddColumnsToLoginNamesView,
 	} {
 		setupErr = executeMigration(ctx, eventstoreClient, step, "migration failed")
 		if setupErr != nil {