Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Function count (children 1)
      ExpressionList (children 1)
       Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Subquery (children 1)
        SelectWithUnionQuery (children 1)
         ExpressionList (children 1)
          SelectQuery (children 3)
           ExpressionList (children 1)
            Identifier number
           TablesInSelectQuery (children 1)
            TablesInSelectQueryElement (children 1)
             TableExpression (children 1)
              Subquery (children 1)
               SelectWithUnionQuery (children 1)
                ExpressionList (children 1)
                 SelectQuery (children 2)
                  ExpressionList (children 1)
                   Identifier number
                  TablesInSelectQuery (children 1)
                   TablesInSelectQueryElement (children 1)
                    TableExpression (children 1)
                     Function numbers (children 1)
                      ExpressionList (children 1)
                       Literal UInt64_1000000
           Function less (children 1)
            ExpressionList (children 2)
             Function rand64 (children 1)
              ExpressionList
             Function multiply (children 1)
              ExpressionList (children 2)
               Literal Float64_0.01
               Literal Float64_18446744073709552000