Gleb Shchepa 897863813e Bug #39653: find_shortest_key in sql_select.cc does not ...

consider clustered primary keys

Choosing a shortest index for the covering index scan,
the optimizer ignored the fact, that the clustered primary
key read involves whole table data.

The find_shortest_key function has been modified to
take into account that fact that a clustered PK has a
longest key of possible covering indices.

2010-03-05 23:45:55 +04:00

16 KiB

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