SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList (children 1)
      Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier source
   Function less (children 1)
    ExpressionList (children 2)
     Function toYYYYMM (children 1)
      ExpressionList (children 1)
       Identifier ts
     Literal UInt64_202312
