✨ Add support for except/intersect queries

Author: julien040

other/sqlparser/ast.go

@@ -300,12 +300,13 @@ type (
 	// Lock is an enum for the type of lock in the statement
 	Lock int8
 
-	// Union represents a UNION statement.
+	// Union represents a UNION/INTERSECT/EXCEPT statement.
 	Union struct {
 		With     *With
 		Left     SelectStatement
 		Right    SelectStatement
 		Distinct bool
+		Type     string
 		OrderBy  OrderBy
 		Limit    *Limit
 		Lock     Lock

other/sqlparser/ast_format.go

@@ -109,10 +109,19 @@ func (node *Union) Format(buf *TrackedBuffer) {
 	}
 
 	buf.WriteByte(' ')
-	if node.Distinct {
-		buf.literal(UnionStr)
-	} else {
-		buf.literal(UnionAllStr)
+	switch node.Type {
+	case "union":
+		buf.literal("union")
+	case "union all":
+		buf.literal("union all")
+	case "union distinct":
+		buf.literal("union distinct")
+	case "except":
+		buf.literal("except")
+	case "intersect":
+		buf.literal("intersect")
+	default:
+		buf.literal("union")
 	}
 	buf.WriteByte(' ')
 

other/sqlparser/ast_format_fast.go

@@ -48,6 +48,8 @@ const (
 	UnionStr         = "union"
 	UnionAllStr      = "union all"
 	UnionDistinctStr = "union distinct"
+	ExceptStr        = "except"
+	IntersectStr     = "intersect"
 
 	// DDL strings.
 	InsertStr  = "insert"

other/sqlparser/constants.go

@@ -728,6 +728,9 @@ var keywords = []keyword{
 	{"undo", UNUSED},
 	{"unicode", UNICODE},
 	{"union", UNION},
+	{"except", EXCEPT},
+	{"intersect", INTERSECT},
+	{"minus", EXCEPT},
 	{"unique", UNIQUE},
 	{"unknown", UNKNOWN},
 	{"unlock", UNLOCK},