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)
     Function tupleElement (children 1)
      ExpressionList (children 2)
       Identifier _partition_value
       Literal UInt64_1
     Literal \'2021-04-01\'
   Set