Explain EXPLAIN (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 2)
     Identifier number
     Function COUNT (alias partition_count) (children 1)
      ExpressionList
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function numbers (children 1)
        ExpressionList (children 1)
         Literal UInt64_10
    Function equals (children 1)
     ExpressionList (children 2)
      Function COUNT (children 1)
       ExpressionList
      Literal UInt64_4
    ExpressionList (children 1)
     OrderByElement (children 1)
      Identifier number
