Commits on Aug 17, 2023

1. db_verify::getIndex(): Support index_col_name optional parts …

   In the MariaDB `CREATE TABLE` [`index_definition`](https://mariadb.com/kb/en/create-table/#index-definitions),
    the `index_col_name` could have an optional length and a sort order:
   
   ```
   index_definition:
       {INDEX|KEY} [index_name] [index_type] (index_col_name,...) [index_option] ...
     {{{|}}} {FULLTEXT|SPATIAL} [INDEX|KEY] [index_name] (index_col_name,...) [index_option] ...
     {{{|}}} [CONSTRAINT [symbol]] PRIMARY KEY [index_type] (index_col_name,...) [index_option] ...
     {{{|}}} [CONSTRAINT [symbol]] UNIQUE [INDEX|KEY] [index_name] [index_type] (index_col_name,...) [index_option] ...
     {{{|}}} [CONSTRAINT [symbol]] FOREIGN KEY [index_name] (index_col_name,...) reference_definition
   
   index_col_name:
       col_name [(length)] [ASC | DESC]
   
   index_type:
       USING {BTREE | HASH | RTREE}
   
   index_option:
       [ KEY_BLOCK_SIZE [=] value
     {{{|}}} index_type
     {{{|}}} WITH PARSER parser_name
     {{{|}}} COMMENT 'string'
     {{{|}}} CLUSTERING={YES| NO} ]
     [ IGNORED | NOT IGNORED ]
   
   reference_definition:
       REFERENCES tbl_name (index_col_name,...)
         [MATCH FULL | MATCH PARTIAL | MATCH SIMPLE]
         [ON DELETE reference_option]
         [ON UPDATE reference_option]
   
   reference_option:
       RESTRICT | CASCADE | SET NULL | NO ACTION
   ```
   
   `db_verify::getIndex()` didn't handle this possibility, leading to a
   database validity check failure despite the index actually existing.
   
   Fixes: e107inc#5054

   

   Deltik committed Aug 17, 2023
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