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      currently a collation lookup (collation name to collation id) is done (in get_collation_number_internal()) by linearly scanning the array of collations.

      This used to work fine, but the number of collations is constantly growing (MDEV-27009, MDEV-20912) and the linear search is starting to become noticeable.

      It would be a good idea to change it to a hash lookup.

      Same can be done for character sets, even though the number of charsets didn't grow that much.

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              bar Alexander Barkov
              serg Sergei Golubchik
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