sergefp@mysql.com f95b5b0a5d BUG#17314: Can't use index_merge/intersection for MERGE tables ...

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.

2006-02-11 21:51:43 +03:00

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