Explain EXPLAIN PIPELINE (children 1)
 InsertQuery   (children 2)
  Identifier test_table
  SelectWithUnionQuery (children 1)
   ExpressionList (children 1)
    SelectQuery (children 2)
     ExpressionList (children 1)
      Literal UInt64_1
     TablesInSelectQuery (children 1)
      TablesInSelectQueryElement (children 1)
       TableExpression (children 1)
        Function numbers (children 1)
         ExpressionList (children 1)
          Literal UInt64_10
