Poor work with plugin_dir and index_token_filter

[klirichek]

Bug Description:

There are several things which are looking more likely defects then features.

1. If a table has non-empty index_token_filter, and is loaded with absent common section in the config, or absent plugin_dir param, daemon issue no messages about it (i.e. everything looks 'healthy').
2. you can't create table with invalid index_token_filter, or absent plugin_dir, or non-valid plugin.

mysql> create table t (t text) index_token_filter = 'my_lib.so:custom_blend:chars=@#&';
Query OK, 0 rows affected (0,00 sec)

3. Insertion into such table provokes a bit confusing message:

mysql> insert into t values (0,'bla');
ERROR 1064 (42000): INTERNAL ERROR: plugin my_lib.so:custom_blend loaded ok but lookup fails, error: plugin support disabled (requires a valid plugin_dir)

Confusion is that is actually no my_lib.so available. Why, then, it says it is 'loaded ok'?

4. Altering with any string is possible, btw. So, you can create table, insert data, and then say alter table t index_token_filter = 'bla';

• no existence of plugin_dir
• nothing ever unusual, that 'bla' doesn't look like so-name, and that is doesn't exists

With this things current test 284 is built, and it can be extended if something considered as real bugs to be fixed.

Manticore Search Version:

no concrete

Operating System Version:

no concrete

Have you tried the latest development version?

• Yes

Internal Checklist:

^{To be completed by the assignee. Check off tasks that have been completed or are not applicable.}

• Task estimated
• Specification created, reviewed, and approved
• Implementation completed
• Tests developed
• Documentation updated
• Documentation proofread
• Changelog updated

[sanikolaev]

If a table has non-empty index_token_filter, and is loaded with absent common section in the config, or absent plugin_dir param, daemon issue no messages about it (i.e. everything looks 'healthy').

According to the docs, plugin_dir has a default value:

The default path is /usr/local/lib/manticore/

[sanikolaev]

Altering with any string is possible, btw. So, you can create table, insert data, and then say alter table t index_token_filter = 'bla';

As discussed with Alexey, it makes sense to think about the proper behaviour when you have different tokenization settings in different chunks in general.