Enable 227 format roundtrip tests by adding missing Format support

ast/ast.go

@@ -43,8 +43,9 @@ func (s *SelectWithUnionQuery) statementNode()      {}
 
 // SelectIntersectExceptQuery represents SELECT ... INTERSECT/EXCEPT ... queries.
 type SelectIntersectExceptQuery struct {
-	Position token.Position `json:"-"`
-	Selects  []Statement    `json:"selects"`
+	Position  token.Position `json:"-"`
+	Selects   []Statement    `json:"selects"`
+	Operators []string       `json:"operators,omitempty"` // "INTERSECT", "EXCEPT", etc. for each operator between selects
 }
 
 func (s *SelectIntersectExceptQuery) Pos() token.Position { return s.Position }

internal/format/expressions.go

@@ -79,8 +79,9 @@ func formatLiteral(sb *strings.Builder, lit *ast.Literal) {
 	switch lit.Type {
 	case ast.LiteralString:
 		sb.WriteString("'")
-		// Escape single quotes in the string
+		// Escape backslashes and single quotes in the string
 		s := lit.Value.(string)
+		s = strings.ReplaceAll(s, `\`, `\\`)
 		s = strings.ReplaceAll(s, "'", "''")
 		sb.WriteString(s)
 		sb.WriteString("'")
@@ -289,6 +290,11 @@ func formatBinaryExpr(sb *strings.Builder, expr *ast.BinaryExpr) {
 // formatUnaryExpr formats a unary expression.
 func formatUnaryExpr(sb *strings.Builder, expr *ast.UnaryExpr) {
 	sb.WriteString(expr.Op)
+	// Add space after word operators like NOT
+	op := strings.ToUpper(expr.Op)
+	if op == "NOT" {
+		sb.WriteString(" ")
+	}
 	Expression(sb, expr.Operand)
 }
 

internal/format/format.go

@@ -67,6 +67,10 @@ func Statement(sb *strings.Builder, stmt ast.Statement) {
 		formatDetachQuery(sb, s)
 	case *ast.AttachQuery:
 		formatAttachQuery(sb, s)
+	case *ast.ShowPrivilegesQuery:
+		formatShowPrivilegesQuery(sb, s)
+	case *ast.ShowCreateQuotaQuery:
+		formatShowCreateQuotaQuery(sb, s)
 	default:
 		// Fallback for unhandled statements
 	}

internal/format/statements.go

@@ -369,7 +369,15 @@ func formatOrderByElement(sb *strings.Builder, o *ast.OrderByElement) {
 func formatSelectIntersectExceptQuery(sb *strings.Builder, q *ast.SelectIntersectExceptQuery) {
 	for i, sel := range q.Selects {
 		if i > 0 {
-			sb.WriteString(" ")
+			// Get the operator between selects (operators[i-1] corresponds to the operator before selects[i])
+			opIdx := i - 1
+			if opIdx < len(q.Operators) {
+				sb.WriteString(" ")
+				sb.WriteString(q.Operators[opIdx])
+				sb.WriteString(" ")
+			} else {
+				sb.WriteString(" ")
+			}
 		}
 		Statement(sb, sel)
 	}
@@ -1084,3 +1092,23 @@ func formatAttachQuery(sb *strings.Builder, q *ast.AttachQuery) {
 	}
 	sb.WriteString(q.Table)
 }
+
+// formatShowPrivilegesQuery formats a SHOW PRIVILEGES statement.
+func formatShowPrivilegesQuery(sb *strings.Builder, q *ast.ShowPrivilegesQuery) {
+	if q == nil {
+		return
+	}
+	sb.WriteString("SHOW PRIVILEGES")
+}
+
+// formatShowCreateQuotaQuery formats a SHOW CREATE QUOTA statement.
+func formatShowCreateQuotaQuery(sb *strings.Builder, q *ast.ShowCreateQuotaQuery) {
+	if q == nil {
+		return
+	}
+	sb.WriteString("SHOW CREATE QUOTA")
+	if q.Name != "" {
+		sb.WriteString(" ")
+		sb.WriteString(q.Name)
+	}
+}