SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tbl
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier _partition_value
     Literal Tuple_(\'2021-04-01\', UInt64_1, UInt64_2)
   Set