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Some tests fail when they are run on a host with hostname=localhost. It happens because instead of expected 4 'root' records in mysql.user the server has 3. Tests that check for that one or another way fail with mismatches.
We can either add a check and skip such tests, or just document the limitation. Documenting is easier, but I suppose checking and skipping is cleaner and will cause less confusion later, because it's not clear at all from the test output why they fail.
Example: main.join_cache
--- /data/repo/git/10.0/mysql-test/r/join_cache.result 2015-02-26 02:18:30.000000000 +0300
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+++ /data/repo/git/10.0/mysql-test/r/join_cache.reject 2015-03-12 01:57:06.000000000 +0300
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@@ -5885,6 +5885,6 @@
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SELECT * FROM INFORMATION_SCHEMA.PROFILING, mysql.user WHERE password_expired = PAGE_FAULTS_MINOR;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE PROFILING ALL NULL NULL NULL NULL NULL Using where
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-1 SIMPLE user hash_ALL NULL #hash#$hj 1 information_schema.PROFILING.PAGE_FAULTS_MINOR 4 Using where; Using join buffer (flat, BNLH join)
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+1 SIMPLE user hash_ALL NULL #hash#$hj 1 information_schema.PROFILING.PAGE_FAULTS_MINOR 3 Using where; Using join buffer (flat, BNLH join)
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set join_cache_level=default;
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set @@optimizer_switch=@save_optimizer_switch;
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