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MDEV-21610 Different query results from 10.4.11 to 10.4.12
Part#2: cleanup: In the part 1 of the fix, DS-MRR implementation would peek into the JOIN_TAB to get the rowid filter from table->reginfo.join_tab->rowid_filter This doesn't look good from code isolation standpoint (why should a storage engine assume it is used through a JOIN_TAB?). Fixed this by storing the 'un-pushed' rowid_filter in the DsMrr_impl structure. The filter survives across multi_range_read_init() calls. It is discarded when somebody calls index_end() or rnd_end() and cleans up the DsMrr_impl.
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