mysql - Error Code: 1054. Unknown column 'abcdef' in 'field list' in stored procedure -

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i have written following stored procedure. working quite fine , giving correct results. after addition of attributes shows error. if change name of last retrieved attribute 4 letters word runs correctly. if run stored procedure shows error: "error code: 1054. unknown column 'fiel' in 'field list'"

if run independent statements shows errors: "0 row(s) affected, 1 warning(s): 1260 row 69 cut group_concat()" "error code: 1054. unknown column 'fiel' in 'field list'"

    create definer=`root`@`localhost` procedure `getcases`()       begin         set @sql = concat('select ', (select group_concat(column_name)            information_schema.columns table_schema = 'xyz_data_base'              , table_name = 'table1'              , column_name not in ('col_one', 'col_last')),              ', table2.name xyz_data_base.table1, xyz_data_base.table2                table1.col_last = table2.id');           prepare stmt1 @sql;         execute stmt1;     end

before run group_concat must change system parameter group_concat_max_len prevent results cut.

    create definer=`root`@`localhost` procedure `getcases`()       begin          set @@session.group_concat_max_len = 10000;          set @sql = concat('select ', (select group_concat(column_name)            information_schema.columns table_schema = 'xyz_data_base'              , table_name = 'table1'              , column_name not in ('col_one', 'col_last')),              ', table2.name xyz_data_base.table1, xyz_data_base.table2                table1.col_last = table2.id');           prepare stmt1 @sql;         execute stmt1;     end




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