fix: incorrect reference to catalog (#332)

adapter/adapter.go

@@ -14,6 +14,8 @@ type ConnectionHolder interface {
 	GetCatalogConn(ctx context.Context) (*stdsql.Conn, error)
 	GetCatalogTxn(ctx context.Context, options *stdsql.TxOptions) (*stdsql.Tx, error)
 	TryGetTxn() *stdsql.Tx
+	GetCurrentCatalog() string
+	GetCurrentSchema() string
 	CloseTxn()
 	CloseConn()
 }
@@ -42,6 +44,14 @@ func TryGetTxn(ctx *sql.Context) *stdsql.Tx {
 	return ctx.Session.(ConnectionHolder).TryGetTxn()
 }
 
+func GetCurrentCatalog(ctx *sql.Context) string {
+	return ctx.Session.(ConnectionHolder).GetCurrentCatalog()
+}
+
+func GetCurrentSchema(ctx *sql.Context) string {
+	return ctx.Session.(ConnectionHolder).GetCurrentSchema()
+}
+
 func CloseTxn(ctx *sql.Context) {
 	ctx.Session.(ConnectionHolder).CloseTxn()
 }

backend/executor.go

@@ -17,6 +17,7 @@ import (
 	stdsql "database/sql"
 	"fmt"
 
+	"github.com/apecloud/myduckserver/adapter"
 	"github.com/apecloud/myduckserver/catalog"
 	"github.com/apecloud/myduckserver/transpiler"
 	"github.com/dolthub/go-mysql-server/sql"
@@ -124,7 +125,7 @@ func (b *DuckBuilder) Build(ctx *sql.Context, root sql.Node, r sql.Row) (sql.Row
 
 	switch node := n.(type) {
 	case *plan.Use:
-		useStmt := "USE " + catalog.FullSchemaName(b.provider.CatalogName(), node.Database().Name())
+		useStmt := "USE " + catalog.FullSchemaName(adapter.GetCurrentCatalog(ctx), node.Database().Name())
 		if _, err := conn.ExecContext(ctx.Context, useStmt); err != nil {
 			if catalog.IsDuckDBSetSchemaNotFoundError(err) {
 				return nil, sql.ErrDatabaseNotFound.New(node.Database().Name())

backend/session.go

@@ -225,6 +225,16 @@ func (sess *Session) TryGetTxn() *stdsql.Tx {
 	return sess.db.Pool().TryGetTxn(sess.ID())
 }
 
+// GetCurrentCatalog implements adapter.ConnectionHolder.
+func (sess *Session) GetCurrentCatalog() string {
+	return sess.db.Pool().CurrentCatalog(sess.ID())
+}
+
+// GetCurrentSchema implements adapter.ConnectionHolder.
+func (sess *Session) GetCurrentSchema() string {
+	return sess.db.Pool().CurrentSchema(sess.ID())
+}
+
 // CloseTxn implements adapter.ConnectionHolder.
 func (sess *Session) CloseTxn() {
 	sess.db.Pool().CloseTxn(sess.ID())

catalog/connpool.go

@@ -30,16 +30,14 @@ import (
 type ConnectionPool struct {
 	*stdsql.DB
 	connector *duckdb.Connector
-	catalog   string
 	conns     sync.Map // concurrent-safe map[uint32]*stdsql.Conn
 	txns      sync.Map // concurrent-safe map[uint32]*stdsql.Tx
 }
 
-func NewConnectionPool(catalog string, connector *duckdb.Connector, db *stdsql.DB) *ConnectionPool {
+func NewConnectionPool(connector *duckdb.Connector, db *stdsql.DB) *ConnectionPool {
 	return &ConnectionPool{
 		DB:        db,
 		connector: connector,
-		catalog:   catalog,
 	}
 }
 
@@ -57,13 +55,30 @@ func (p *ConnectionPool) CurrentSchema(id uint32) string {
 	}
 	conn := entry.(*stdsql.Conn)
 	var schema string
-	if err := conn.QueryRowContext(context.Background(), "SELECT CURRENT_SCHEMA()").Scan(&schema); err != nil {
+	if err := conn.QueryRowContext(context.Background(), "SELECT CURRENT_SCHEMA").Scan(&schema); err != nil {
 		logrus.WithError(err).Error("Failed to get current schema")
 		return ""
 	}
 	return schema
 }
 
+// CurrentCatalog retrieves the current catalog of the connection.
+// Returns an empty string if the connection is not established
+// or the catalog cannot be retrieved.
+func (p *ConnectionPool) CurrentCatalog(id uint32) string {
+	entry, ok := p.conns.Load(id)
+	if !ok {
+		return ""
+	}
+	conn := entry.(*stdsql.Conn)
+	var catalog string
+	if err := conn.QueryRowContext(context.Background(), "SELECT CURRENT_CATALOG").Scan(&catalog); err != nil {
+		logrus.WithError(err).Error("Failed to get current catalog")
+		return ""
+	}
+	return catalog
+}
+
 func (p *ConnectionPool) GetConn(ctx context.Context, id uint32) (*stdsql.Conn, error) {
 	var conn *stdsql.Conn
 	entry, ok := p.conns.Load(id)
@@ -88,11 +103,11 @@ func (p *ConnectionPool) GetConnForSchema(ctx context.Context, id uint32, schema
 
 	if schemaName != "" {
 		var currentSchema string
-		if err := conn.QueryRowContext(context.Background(), "SELECT CURRENT_SCHEMA()").Scan(&currentSchema); err != nil {
+		if err := conn.QueryRowContext(context.Background(), "SELECT CURRENT_SCHEMA").Scan(&currentSchema); err != nil {
 			logrus.WithError(err).Error("Failed to get current schema")
 			return nil, err
 		} else if currentSchema != schemaName {
-			if _, err := conn.ExecContext(context.Background(), "USE "+FullSchemaName(p.catalog, schemaName)); err != nil {
+			if _, err := conn.ExecContext(context.Background(), "USE "+FullSchemaName(p.CurrentCatalog(id), schemaName)); err != nil {
 				if IsDuckDBSetSchemaNotFoundError(err) {
 					return nil, sql.ErrDatabaseNotFound.New(schemaName)
 				}
@@ -187,15 +202,14 @@ func (p *ConnectionPool) Close() error {
 	return errors.Join(lastErr, p.DB.Close())
 }
 
-func (p *ConnectionPool) Reset(catalog string, connector *duckdb.Connector, db *stdsql.DB) error {
+func (p *ConnectionPool) Reset(connector *duckdb.Connector, db *stdsql.DB) error {
 	err := p.Close()
 	if err != nil {
 		return fmt.Errorf("failed to close connection pool: %w", err)
 	}
 
 	p.conns.Clear()
 	p.txns.Clear()
-	p.catalog = catalog
 	p.DB = db
 	p.connector = connector
 

catalog/provider.go

@@ -14,7 +14,6 @@ import (
 
 	"github.com/dolthub/go-mysql-server/sql"
 	"github.com/marcboeker/go-duckdb"
-	_ "github.com/marcboeker/go-duckdb"
 
 	"github.com/apecloud/myduckserver/adapter"
 	"github.com/apecloud/myduckserver/configuration"
@@ -27,7 +26,7 @@ type DatabaseProvider struct {
 	connector                 *duckdb.Connector
 	storage                   *stdsql.DB
 	pool                      *ConnectionPool
-	catalogName               string // database name in postgres
+	defaultCatalogName        string // default database name in postgres
 	dataDir                   string
 	dbFile                    string
 	dsn                       string
@@ -60,11 +59,11 @@ func NewDBProvider(defaultTimeZone, dataDir, defaultDB string) (prov *DatabasePr
 
 	shouldInit := true
 	if defaultDB == "" || defaultDB == "memory" {
-		prov.catalogName = "memory"
+		prov.defaultCatalogName = "memory"
 		prov.dbFile = ""
 		prov.dsn = ""
 	} else {
-		prov.catalogName = defaultDB
+		prov.defaultCatalogName = defaultDB
 		prov.dbFile = defaultDB + ".db"
 		prov.dsn = filepath.Join(prov.dataDir, prov.dbFile)
 		_, err = os.Stat(prov.dsn)
@@ -76,7 +75,7 @@ func NewDBProvider(defaultTimeZone, dataDir, defaultDB string) (prov *DatabasePr
 		return nil, err
 	}
 	prov.storage = stdsql.OpenDB(prov.connector)
-	prov.pool = NewConnectionPool(prov.catalogName, prov.connector, prov.storage)
+	prov.pool = NewConnectionPool(prov.connector, prov.storage)
 
 	bootQueries := []string{
 		"INSTALL arrow",
@@ -353,8 +352,8 @@ func (prov *DatabaseProvider) Pool() *ConnectionPool {
 	return prov.pool
 }
 
-func (prov *DatabaseProvider) CatalogName() string {
-	return prov.catalogName
+func (prov *DatabaseProvider) DefaultCatalogName() string {
+	return prov.defaultCatalogName
 }
 
 func (prov *DatabaseProvider) DataDir() string {
@@ -380,7 +379,8 @@ func (prov *DatabaseProvider) AllDatabases(ctx *sql.Context) []sql.Database {
 	prov.mu.RLock()
 	defer prov.mu.RUnlock()
 
-	rows, err := adapter.QueryCatalog(ctx, "SELECT DISTINCT schema_name FROM information_schema.schemata WHERE catalog_name = ?", prov.catalogName)
+	catalogName := adapter.GetCurrentCatalog(ctx)
+	rows, err := adapter.QueryCatalog(ctx, "SELECT DISTINCT schema_name FROM information_schema.schemata WHERE catalog_name = ?", catalogName)
 	if err != nil {
 		panic(ErrDuckDB.New(err))
 	}
@@ -398,7 +398,7 @@ func (prov *DatabaseProvider) AllDatabases(ctx *sql.Context) []sql.Database {
 			continue
 		}
 
-		all = append(all, NewDatabase(schemaName, prov.catalogName))
+		all = append(all, NewDatabase(schemaName, catalogName))
 	}
 
 	sort.Slice(all, func(i, j int) bool {
@@ -413,13 +413,14 @@ func (prov *DatabaseProvider) Database(ctx *sql.Context, name string) (sql.Datab
 	prov.mu.RLock()
 	defer prov.mu.RUnlock()
 
-	ok, err := hasDatabase(ctx, prov.catalogName, name)
+	catalogName := adapter.GetCurrentCatalog(ctx)
+	ok, err := hasDatabase(ctx, catalogName, name)
 	if err != nil {
 		return nil, err
 	}
 
 	if ok {
-		return NewDatabase(name, prov.catalogName), nil
+		return NewDatabase(name, catalogName), nil
 	}
 	return nil, sql.ErrDatabaseNotFound.New(name)
 }
@@ -429,7 +430,7 @@ func (prov *DatabaseProvider) HasDatabase(ctx *sql.Context, name string) bool {
 	prov.mu.RLock()
 	defer prov.mu.RUnlock()
 
-	ok, err := hasDatabase(ctx, prov.catalogName, name)
+	ok, err := hasDatabase(ctx, adapter.GetCurrentCatalog(ctx), name)
 	if err != nil {
 		panic(err)
 	}
@@ -451,7 +452,8 @@ func (prov *DatabaseProvider) CreateDatabase(ctx *sql.Context, name string) erro
 	prov.mu.Lock()
 	defer prov.mu.Unlock()
 
-	_, err := adapter.ExecCatalog(ctx, fmt.Sprintf(`CREATE SCHEMA %s`, FullSchemaName(prov.catalogName, name)))
+	_, err := adapter.ExecCatalog(ctx, fmt.Sprintf(`CREATE SCHEMA %s`,
+		FullSchemaName(adapter.GetCurrentCatalog(ctx), name)))
 	if err != nil {
 		return ErrDuckDB.New(err)
 	}
@@ -464,7 +466,8 @@ func (prov *DatabaseProvider) DropDatabase(ctx *sql.Context, name string) error
 	prov.mu.Lock()
 	defer prov.mu.Unlock()
 
-	_, err := adapter.Exec(ctx, fmt.Sprintf(`DROP SCHEMA %s CASCADE`, FullSchemaName(prov.catalogName, name)))
+	_, err := adapter.Exec(ctx, fmt.Sprintf(`DROP SCHEMA %s CASCADE`,
+		FullSchemaName(adapter.GetCurrentCatalog(ctx), name)))
 	if err != nil {
 		return ErrDuckDB.New(err)
 	}
@@ -494,5 +497,5 @@ func (prov *DatabaseProvider) Restart(readOnly bool) error {
 	prov.connector = connector
 	prov.storage = storage
 
-	return nil
+	return prov.pool.Reset(connector, storage)
 }

pgserver/backup_handler.go

@@ -89,12 +89,6 @@ func parseBackupSQL(sql string) (*BackupConfig, error) {
 }
 
 func (h *ConnectionHandler) executeBackup(backupConfig *BackupConfig) (string, error) {
-	// TODO(neo.zty): Add support for backing up multiple databases once MyDuck Server supports multi-database functionality.
-	if backupConfig.DbName != h.server.Provider.CatalogName() {
-		return "", fmt.Errorf("backup database name %s does not match server database name %s",
-			backupConfig.DbName, h.server.Provider.CatalogName())
-	}
-
 	sqlCtx, err := h.duckHandler.sm.NewContextWithQuery(context.Background(), h.mysqlConn, "")
 	if err != nil {
 		return "", fmt.Errorf("failed to create context for query: %w", err)
@@ -114,7 +108,7 @@ func (h *ConnectionHandler) executeBackup(backupConfig *BackupConfig) (string, e
 	}
 
 	msg, err := backupConfig.StorageConfig.UploadFile(
-		h.server.Provider.DataDir(), h.server.Provider.DbFile(), backupConfig.RemotePath)
+		h.server.Provider.DataDir(), backupConfig.DbName+".db", backupConfig.RemotePath)
 	if err != nil {
 		return "", err
 	}
@@ -133,12 +127,7 @@ func (h *ConnectionHandler) executeBackup(backupConfig *BackupConfig) (string, e
 
 func (h *ConnectionHandler) restartServer(readOnly bool) error {
 	provider := h.server.Provider
-	err := provider.Restart(readOnly)
-	if err != nil {
-		return err
-	}
-
-	return h.server.Provider.Pool().Reset(provider.CatalogName(), provider.Connector(), provider.Storage())
+	return provider.Restart(readOnly)
 }
 
 func doCheckpoint(sqlCtx *sql.Context) error {

pgserver/connection_handler.go

@@ -313,7 +313,7 @@ func (h *ConnectionHandler) chooseInitialDatabase(startupMessage *pgproto3.Start
 	}
 	if db == "postgres" || db == "mysql" {
 		if provider := h.duckHandler.GetCatalogProvider(); provider != nil {
-			db = provider.CatalogName()
+			db = provider.DefaultCatalogName()
 		}
 	}