Sergei Petrunia cdb29960d2 MDEV-17783: AddressSanitizer: stack-buffer-overflow in table_cond_selectivity ...

A less-intrusive fix: don't have table_cond_selectivity() assume that
there are less than MAX_REF_PARTS hash-join KEYUSEs.

If there are more than that, switch to using an array. Allocate the array
on the heap: we can't allocate it on MEM_ROOT as table_cond_selectivity()
is called many times during the optimization.

(Variant 2, with review input addressed)

2021-07-03 12:01:38 +03:00

5.7 KiB

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