SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 2)
      TableIdentifier 02481_merge
      SampleRatio 1 / 2
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier arr
   Function notEquals (children 1)
    ExpressionList (children 2)
     Identifier x
     Literal UInt64_0
