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BUG#17314: Can't use index_merge/intersection for MERGE tables

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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.
This commit is contained in:
sergefp@mysql.com
2006-02-11 21:51:43 +03:00
parent 6fe11666fd
commit f95b5b0a5d
5 changed files with 87 additions and 5 deletions
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2
mysql-test/r/merge.result
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@@ -56,8 +56,8 @@ a b
4 Testing
5 table
5 table
6 t1
6 t2
6 t1
7 Testing
7 Testing
8 table