Subject No index used for join on 'starting with'
Author Rick Debay
This query uses natural for both tables, when I expected it to use an
index for the join.

select *
from table1 t1
join table2 t2 on t2.indexed_char14 starting with t.indexed_char10
where t.unindex_varchar containing 'foo'

This uses an index, so the optimizer knows about it.

select *
from table2 t2
where t2.indexed_char14 starting with 'bar'

How can I get the optimizer to use the index for the join?

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