Package structure refactor.

order_by_clause.go

@@ -1,35 +0,0 @@
-package jet
-
-import "errors"
-
-// OrderByClause
-type orderByClause interface {
-	serializeForOrderBy(statement statementType, out *sqlBuilder) error
-}
-
-type orderByClauseImpl struct {
-	expression Expression
-	ascent     bool
-}
-
-func (o *orderByClauseImpl) serializeForOrderBy(statement statementType, out *sqlBuilder) error {
-	if o.expression == nil {
-		return errors.New("jet: nil orderBy by clause")
-	}
-
-	if err := o.expression.serializeForOrderBy(statement, out); err != nil {
-		return err
-	}
-
-	if o.ascent {
-		out.writeString("ASC")
-	} else {
-		out.writeString("DESC")
-	}
-
-	return nil
-}
-
-func newOrderByClause(expression Expression, ascent bool) orderByClause {
-	return &orderByClauseImpl{expression: expression, ascent: ascent}
-}