Marko Mäkelä added a comment - 2021-12-14 10:01 Later, I will try to create an SQL version of the above Perl using appropriate constructs: SELECT …unhex(hex(crc32c(…)))… INTO DUMPFILE 'ib_logfile0' ;

Marko Mäkelä added a comment - 2021-12-15 13:28 Here is the SQL to create a logically empty log file in the MDEV-14425 format corresponding to the 64-bit log sequence number specified in the first line: set @lsn=x '000000000000c96b' ; set @header=concat( 'Phys' ,x '00000000' ,@lsn,repeat(x '00' ,492)); set @header=concat(@header,unhex(hex(crc32c(@header))),repeat(x '00' ,3584));   set @ checkpoint =concat(@lsn,@lsn,repeat(x '00' ,44)); set @ checkpoint =concat(@ checkpoint ,unhex(hex(crc32c(@ checkpoint ))), repeat(x '00' ,8128)); set @payload=concat(x 'fa0000' ,@lsn); set @payload=concat(@payload,x '01' ,unhex(hex(crc32c(@payload))));   select concat(@header,@ checkpoint ,@payload) into dumpfile 'ib_logfile0' ;

Marko Mäkelä added a comment - 2022-01-05 13:18 serg , based on your review feedback I reversed the arguments of the 2-ary functions. When a previous checksum is specified, it must be the first and not the second argument: SELECT CRC32C( 'MariaDB' ),CRC32C(CRC32C( 'Maria' ), 'DB' ),CRC32C(0, 'MariaDB' ); This would return the same value 809606978 three times.

Elena Stepanova added a comment - 2022-01-21 02:29 - edited According to GCOV, there are a few missing lines in the coverage: line numbers as of preview-10.8-MDEV-27265-misc 6e615c62b ===File sql/item_create.cc: 3141 : + my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name->str); 3142 : + return nullptr; 3150 : + my_error(ER_WRONG_PARAMETERS_TO_NATIVE_FCT, MYF(0), name->str); 3151 : + return nullptr; 3170 : + my_error(ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT, MYF(0), name->str); 3171 : + return nullptr; 3179 : + my_error(ER_WRONG_PARAMETERS_TO_NATIVE_FCT, MYF(0), name->str); 3180 : + return nullptr; These are minor omissions, but maybe it makes sense to add queries for them, for completeness. 3141/3142 and 3170/3171 seem obvious, something like --error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT select crc32(1, 'foo' , 'bar' ); --error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT select crc32c(1, 'foo' , 'bar' ); should do it. For the other two errors, I can't see at the first glance how to get there, but I suppose whoever wrote it would know right away. I have no objections against merging the new variations of functions into 10.8 main and releasing with 10.8.1. The above note about MTR tests is not a mandatory requirement. It concerns the functions themselves, the way they appear to work as built-in functions. How InnoDB uses them to create its log is out of the scope of this task. The functions don't work with Columnstore ( MCOL-4966 to track), but anyway Columnstore doesn't support everything that the server does, so I don't see it as a blocker. Also the functions lack proper parameter validation, but as a legacy issue concerning other existing functions ( MDEV-27480 ), it cannot block the feature either.

Marko Mäkelä added a comment - 2022-01-21 17:20 The handling for the error ER_WRONG_PARAMETERS_TO_NATIVE_FCT is redundant and unreachable: --error ER_WRONG_PARAMETERS_TO_NATIVE_FCT select crc32c( '' as empty); #0 my_error (nr=1583, MyFlags=0) at /mariadb/10.8/mysys/my_error.c:109 #1 0x00005635f0b30506 in Create_native_func::create_func ( this=0x5635f1ceb478 <Create_func_crc32c::s_singleton>, thd=0x7f8b34000d48, name=0x7f8b4a75e6d0, item_list=0x7f8b34016f20) at /mariadb/10.8/sql/item_create.cc:2653 #2 0x00005635f0a321e0 in MYSQLparse (thd=thd@entry=0x7f8b34000d48) at /mariadb/10.8/sql/sql_yacc.yy:10441 Item* Create_native_func::create_func(THD *thd, LEX_CSTRING *name, List<Item> *item_list) { if (unlikely(has_named_parameters(item_list))) { my_error(ER_WRONG_PARAMETERS_TO_NATIVE_FCT, MYF(0), name->str); return NULL; }   return create_native(thd, name, item_list); } I will replace those redundant error checks with assertions and include test cases to exercise this.