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#42: Range in form tbl.key > const doesn't work in reverse column family
Summary: Fix issue #42. Also issue #43: Ranges on t.key > const are not handled efficiently: Make ha_rocksdb::index_read_map() do the right thing when invoked with find_flag=HA_READ_KEY_OR_NEXT, both for forward and reverse column families. Detailed explanation of actions is provided in rocksdb-range-access.txt Test Plan: mtr t/rocksdb_range.test, used gcov to check the new code is covered Reviewers: maykov, hermanlee4, jonahcohen, jtolmer, yoshinorim Reviewed By: yoshinorim Differential Revision: https://reviews.facebook.net/D35103
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