diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/arel/visitors/mysql.rb | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/arel/visitors/mysql.rb b/lib/arel/visitors/mysql.rb index 763cf11aad..70166a15c5 100644 --- a/lib/arel/visitors/mysql.rb +++ b/lib/arel/visitors/mysql.rb @@ -2,6 +2,28 @@ module Arel module Visitors class MySQL < Arel::Visitors::ToSql private + def visit_Arel_Nodes_Union o, suppress_parens = false + left_result = case o.left + when Arel::Nodes::Union + visit_Arel_Nodes_Union o.left, true + else + visit o.left + end + + right_result = case o.right + when Arel::Nodes::Union + visit_Arel_Nodes_Union o.right, true + else + visit o.right + end + + if suppress_parens + "#{left_result} UNION #{right_result}" + else + "( #{left_result} UNION #{right_result} )" + end + end + def visit_Arel_Nodes_Bin o "BINARY #{visit o.expr}" end |