SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function replaceRegexpAll (children 1)
     ExpressionList (children 3)
      Identifier explain
      Literal \'__table1\\\\.|_UInt8\'
      Literal \'\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function viewExplain (children 1)
              ExpressionList (children 3)
               Literal \'EXPLAIN\'
               Literal \'actions = 1\'
               Subquery (children 1)
                SelectWithUnionQuery (children 1)
                 ExpressionList (children 1)
                  SelectQuery (children 3)
                   ExpressionList (children 1)
                    Identifier i
                   TablesInSelectQuery (children 1)
                    TablesInSelectQueryElement (children 1)
                     TableExpression (children 1)
                      TableIdentifier index_append_test_test
                   Function equals (children 1)
                    ExpressionList (children 2)
                     Identifier a
                     Literal UInt64_0
   Function or (children 1)
    ExpressionList (children 2)
     Function like (children 1)
      ExpressionList (children 2)
       Identifier explain
       Literal \'%Prewhere%\'
     Function like (children 1)
      ExpressionList (children 2)
       Identifier explain
       Literal \'%Filter column%\'
   Set