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  1. MariaDB Server
  2. MDEV-15956

Strange ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN upon ALTER on versioning column

Details

    Description

      create or replace table t1 (i int, j int as (i), s timestamp(6) as row start, e timestamp(6) as row end, period for system_time(s,e)) with system versioning;
      		 
       
      		 
      alter table t1 modify s timestamp(6) as row start;

      ALTER returns the error:

      MariaDB [test]> alter table t1 modify s timestamp(6) as row start;
      		 
      ERROR 1907 (HY000): This is not yet supported for generated columns

      This is strange, because ALTER doesn't even modify anything; and even more strange, because ALTER on the same table for a generated column not related to versioning works all right:

      MariaDB [test]> alter table t1 modify j int as (i);
      		 
      Query OK, 0 rows affected (0.00 sec)
      		 
      Records: 0  Duplicates: 0  Warnings: 0

      It would be understandable if it said that ALTER is not supported for versioning columns (if that's indeed so), but the error as it is now is wrong.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14702 Not helpful error message upon ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN

          • Major - Major loss of function.
          • Open

          Activity

            Ascending order - Click to sort in descending order
            midenok Aleksey Midenkov added a comment - 

            #0  my_error (nr=1907, MyFlags=0) at /home/midenok/src/mariadb/trunk/src/mysys/my_error.c:113
            		 
            #1  0x0000000000b15370 in Vers_parse_info::fix_alter_info (this=0x7fffe52ab4e0, thd=0x7fff84000d50, alter_info=0x7fffe52ab2e0, create_info=0x7fffe52ab390, table=0x7fff840fae50) at /home/midenok/src/mariadb/trunk/src/sql/handler.cc:7150
            		 
            #2  0x00000000008ac55e in mysql_alter_table (thd=0x7fff84000d50, new_db=0x7fff84005398, new_name=0x7fff84005748, create_info=0x7fffe52ab390, table_list=0x7fff84013a88, alter_info=0x7fffe52ab2e0, order_num=0, order=0x0, ignore=false) at /home/midenok/src/mariadb/trunk/src/sql/sql_table.cc:9349
            		 
            #3  0x0000000000954a61 in Sql_cmd_alter_table::execute (this=0x7fff84014208, thd=0x7fff84000d50) at /home/midenok/src/mariadb/trunk/src/sql/sql_alter.cc:328
            		 
            #4  0x00000000007b6d91 in mysql_execute_command (thd=0x7fff84000d50) at /home/midenok/src/mariadb/trunk/src/sql/sql_parse.cc:6292
            		 
            #5  0x00000000007a89a3 in mysql_parse (thd=0x7fff84000d50, rawbuf=0x7fff84013978 "alter table t1 modify s timestamp(6) as row start", length=49, parser_state=0x7fffe52ae640, is_com_multi=false, is_next_command=false) at /home/midenok/src/mariadb/trunk/src/sql/sql_parse.cc:8021

            midenok Aleksey Midenkov added a comment - #0 my_error (nr=1907, MyFlags=0) at /home/midenok/src/mariadb/trunk/src/mysys/my_error.c:113 #1 0x0000000000b15370 in Vers_parse_info::fix_alter_info (this=0x7fffe52ab4e0, thd=0x7fff84000d50, alter_info=0x7fffe52ab2e0, create_info=0x7fffe52ab390, table=0x7fff840fae50) at /home/midenok/src/mariadb/trunk/src/sql/handler.cc:7150 #2 0x00000000008ac55e in mysql_alter_table (thd=0x7fff84000d50, new_db=0x7fff84005398, new_name=0x7fff84005748, create_info=0x7fffe52ab390, table_list=0x7fff84013a88, alter_info=0x7fffe52ab2e0, order_num=0, order=0x0, ignore=false) at /home/midenok/src/mariadb/trunk/src/sql/sql_table.cc:9349 #3 0x0000000000954a61 in Sql_cmd_alter_table::execute (this=0x7fff84014208, thd=0x7fff84000d50) at /home/midenok/src/mariadb/trunk/src/sql/sql_alter.cc:328 #4 0x00000000007b6d91 in mysql_execute_command (thd=0x7fff84000d50) at /home/midenok/src/mariadb/trunk/src/sql/sql_parse.cc:6292 #5 0x00000000007a89a3 in mysql_parse (thd=0x7fff84000d50, rawbuf=0x7fff84013978 "alter table t1 modify s timestamp(6) as row start", length=49, parser_state=0x7fffe52ae640, is_com_multi=false, is_next_command=false) at /home/midenok/src/mariadb/trunk/src/sql/sql_parse.cc:8021
            midenok Aleksey Midenkov added a comment -

            Fixed:

            ERROR 4130 (HY000): Can not change system versioning field `s`

            midenok Aleksey Midenkov added a comment - Fixed: ERROR 4130 (HY000): Can not change system versioning field `s`

            People

              midenok Aleksey Midenkov
              elenst Elena Stepanova
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                Updated:
                Resolved:

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