Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier ccc
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 2)
          SelectQuery (children 1)
           ExpressionList (children 1)
            Literal UInt64_1 (alias ccc)
          SelectQuery (children 2)
           ExpressionList (children 1)
            Asterisk
           TablesInSelectQuery (children 2)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              Subquery (children 1)
               SelectWithUnionQuery (children 1)
                ExpressionList (children 1)
                 SelectQuery (children 1)
                  ExpressionList (children 1)
                   Literal UInt64_2 (alias ccc)
            TablesInSelectQueryElement (children 2)
             TableExpression (children 1)
              Subquery (children 1)
               SelectWithUnionQuery (children 1)
                ExpressionList (children 1)
                 SelectQuery (children 1)
                  ExpressionList (children 1)
                   Literal UInt64_2 (alias ccc)
             TableJoin (children 1)
              ExpressionList (children 1)
               Identifier ccc
    Function greater (children 1)
     ExpressionList (children 2)
      Identifier ccc
      Literal UInt64_1