Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Function CAST (children 1)
      ExpressionList (children 2)
       Literal \'[\\\'2010-10-10\\\', \\\'2010-10-10\\\']\'
       Literal \'Array(Date)\'