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Please consider LP BUG#725050 - related to join_cache_hashed



the following bug is present in different ways both
in 5.3 and in 5.3-mwl89.


The crash in 5.3-mwl89 appeared after merging with
the latest 5.3. The crash in 5.3 requires a rather
artificial example, but it shows that there is some
inconsistency in JOIN::keyuse in 5.3.

Please look at the last bug comment - it contains
a very small test case.

I will ping you tonight after putting kids to sleep
around 21:30.