Explain EXPLAIN PIPELINE (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 2)
           ExpressionList (children 2)
            Identifier day_
            Function if (alias type_1) (children 1)
             ExpressionList (children 3)
              Function equals (children 1)
               ExpressionList (children 2)
                Identifier type_1
                Literal \'\'
              Literal \'all\'
              Identifier type_1
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              Subquery (alias t) (children 1)
               SelectWithUnionQuery (children 1)
                ExpressionList (children 1)
                 SelectQuery (children 4)
                  ExpressionList (children 2)
                   Identifier day_
                   Identifier type_1
                  TablesInSelectQuery (children 1)
                   TablesInSelectQueryElement (children 1)
                    TableExpression (children 1)
                     TableIdentifier test_grouping_sets_predicate
                  Function equals (children 1)
                   ExpressionList (children 2)
                    Identifier day_
                    Literal \'2023-01-05\'
                  ExpressionList (children 2)
                   ExpressionList (children 2)
                    Identifier day_
                    Identifier type_1
                   ExpressionList (children 1)
                    Identifier day_
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier type_1
      Literal \'all\'
    Set
