9ca52a9...
by
Rucha Deodhar <email address hidden>
MDEV-31477: Inconsistent handling while fetching values in json
Analysis:
JSON_KEY_VALUE() uses Json_path_extractor::extract() to reach to path and
extract values. One error it only returns true, but no error.
Fix:
report error when there is error in scanning json document.
MDEV-31479: Inconsistency between MRR and SQL layer costs can cause poor query plan
(Same as
TODO-3938: best_access_path shows negative costs for mrr=on)
best_access_path() assumes that quick select cost includes
(quick->rows/TIME_FOR_COMPARE) as a cost of checking the attached
part of the WHERE condition.
It calls adjust_quick_cost() to subtract addition from quick's cost.
The problem was that DS-MRR cost formula didn't include this cost.
For very large tables, adjust_quick_cost() would produce a negative
cost which would cause assert in debug build or bad query plan choice
in release builds.
MDEV-31442 page_cleaner thread aborts while releasing the tablespace
After further I/O on a tablespace has been stopped
(for example due to DROP TABLE or an operation that
rebuilds a table), page cleaner thread tries to
flush the pending writes for the tablespace and
releases the tablespace reference even though it was not
acquired.
fil_space_t::flush(): Don't release the tablespace when it is
being stopped and closed
The test gcol.gcol_purge would reliably hang on 10.6 on a
Microsoft Windows builder without this adjustment.
A similar adjustment was applied in
commit 3e40f9a7f3bbe82d96c8acccbb017deebfa00647
to the tests innodb.dml_purge and innodb.instant_alter_purge.
