Added support for arithmetics inside queries

parsers/models.go

@@ -35,6 +35,7 @@ const (
 	SelectItemTypeFunctionCall
 	SelectItemTypeSubQuery
 	SelectItemTypeExpression
+	SelectItemTypeBinaryExpression
 )
 
 type SelectItem struct {
@@ -65,6 +66,12 @@ type ComparisonExpression struct {
 	Operation string
 }
 
+type BinaryExpression struct {
+	Left      interface{}
+	Right     interface{}
+	Operation string
+}
+
 type ConstantType int
 
 const (