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sergefp@mysql.com authored
1. Fix index access costs for MERGE tables, set block_size=myisam_block_size/#underlying_tables instead of 0 which it was before. 2. Make index scans on MERGE table to return records in (key_tuple, merge_table_rowid) order, instead of just (key_tuple) order. This makes an index scan on MERGE table to be truly a ROR-scan which is a requirement for index_merge union/intersection.
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