Type:
Bug
Priority:
Critical
Resolution:
Unresolved
Affects Version/s:
10.4(EOL) , 10.5 , 10.6 , 10.7(EOL) , 10.8(EOL) , 10.9(EOL) , 10.10(EOL) , 10.11 , 11.0(EOL) , 11.1(EOL) , 11.2(EOL)
As noted in MDEV-31558 , a covering secondary index read in InnoDB would look up the clustered index record twice and retrieve the matching version. In the test innodb.mvcc_secondary we have a table with 2 versions of 1 row, and the first SELECT statement would construct the old version of the clustered index not once, but twice.
MDEV-20301 replaced row_sel_get_clust_rec_for_mysql() with Row_sel_get_clust_rec_for_mysql::operator() , which adds some caching. It missed an opportunity to remove the call row_sel_sec_rec_is_for_clust_rec() and to perform those checks as part of the loop that invokes row_sel_build_prev_vers_for_mysql() .
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