SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 2)
    Identifier val
    Function avg (children 1)
     ExpressionList (children 1)
      Function toUInt32 (children 1)
       ExpressionList (children 1)
        Identifier val
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_group_by_lowcardinality
   ExpressionList (children 1)
    Identifier val
   Literal UInt64_10
   Set
 Identifier JSONEachRow