feat: add support for RENAME TABLE and RENAME COLUMN

internal/sqlparser/postgresql.go

@@ -52,13 +52,15 @@ func (p *postgresParser) ParseSchema(files []string) (*catalog.Catalog, error) {
 			case *pg.Node_AlterEnumStmt:
 				p.handleAlterEnum(cat, n.AlterEnumStmt)
 			case *pg.Node_DropStmt:
-				p.handleDropStmt(cat, n.DropStmt)
+				p.handleDrop(cat, n.DropStmt)
 			case *pg.Node_IndexStmt:
 				p.handleCreateIndex(cat, n.IndexStmt)
 			case *pg.Node_CreateExtensionStmt:
 				p.handleCreateExtension(cat, n.CreateExtensionStmt)
 			case *pg.Node_ViewStmt:
 				p.handleCreateView(cat, n.ViewStmt)
+			case *pg.Node_RenameStmt:
+				p.handleRename(cat, n.RenameStmt)
 			}
 		}
 	}
@@ -586,7 +588,7 @@ func (p *postgresParser) handleCreateExtension(cat *catalog.Catalog, n *pg.Creat
 	schema.Extensions = append(schema.Extensions, n.Extname)
 }
 
-func (p *postgresParser) handleDropStmt(cat *catalog.Catalog, n *pg.DropStmt) {
+func (p *postgresParser) handleDrop(cat *catalog.Catalog, n *pg.DropStmt) {
 	if n == nil {
 		return
 	}
@@ -760,6 +762,35 @@ func (p *postgresParser) handleCreateView(cat *catalog.Catalog, n *pg.ViewStmt)
 	})
 }
 
+// handleRename processes ALTER TABLE ... RENAME TO / RENAME COLUMN, which
+// Postgres represents as a separate RenameStmt node, not an AlterTableCmd.
+func (p *postgresParser) handleRename(cat *catalog.Catalog, n *pg.RenameStmt) {
+	if n == nil || n.Relation == nil {
+		return
+	}
+
+	schemaName := n.Relation.Schemaname
+	if schemaName == "" {
+		schemaName = cat.DefaultSchema
+	}
+	table := p.findTable(cat, schemaName, n.Relation.Relname)
+	if table == nil {
+		return
+	}
+
+	switch n.RenameType {
+	case pg.ObjectType_OBJECT_TABLE:
+		table.Name = n.Newname
+	case pg.ObjectType_OBJECT_COLUMN:
+		for _, col := range table.Columns {
+			if col.Name == n.Subname {
+				col.Name = n.Newname
+				break
+			}
+		}
+	}
+}
+
 // resolveViewColumns extracts column names and types from a CREATE VIEW statement.
 func (p *postgresParser) resolveViewColumns(cat *catalog.Catalog, n *pg.ViewStmt) []*catalog.Column {
 	if n.Query == nil {

internal/sqlparser/postgresql_test.go

@@ -292,6 +292,41 @@ func TestPostgresAlterTable(t *testing.T) {
 	}
 }
 
+func TestPostgresRenameTableAndColumn(t *testing.T) {
+	path := writeTemp(t, `
+		CREATE TABLE old_name (
+			id SERIAL PRIMARY KEY,
+			bio TEXT NULL
+		);
+		ALTER TABLE old_name RENAME TO new_name;
+		ALTER TABLE new_name RENAME COLUMN bio TO description;
+	`)
+
+	p := newPostgresParser()
+	cat, err := p.ParseSchema([]string{path})
+	if err != nil {
+		t.Fatalf("ParseSchema error: %v", err)
+	}
+
+	table := cat.Schemas[0].Tables[0]
+	if table.Name != "new_name" {
+		t.Fatalf("expected table 'new_name', got %q", table.Name)
+	}
+
+	found := false
+	for _, col := range table.Columns {
+		if col.Name == "description" {
+			found = true
+		}
+		if col.Name == "bio" {
+			t.Error("column 'bio' should have been renamed to 'description'")
+		}
+	}
+	if !found {
+		t.Error("expected renamed column 'description' not found")
+	}
+}
+
 func TestPostgresDropTable(t *testing.T) {
 	path := writeTemp(t, `
 		CREATE TABLE temp_data (id SERIAL PRIMARY KEY, data TEXT);