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Fix for bug#50946: fast index creation still seems to copy the table

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Problem: ALTER TABLE ADD INDEX may lead to table copying if there's
numeric field(s) with non-default display width modificator specified.

Fix: compare numeric field's storage lenghts when we decide whether 
they can be considered 'equal' for table alteration purposes.
This commit is contained in:
Ramil Kalimullin
2010-04-25 15:06:40 +04:00
parent 9ea5576662
commit 4a1a64ec53
4 changed files with 55 additions and 3 deletions
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7
sql/sql_table.cc
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@ -6922,6 +6922,13 @@ view_err:
&candidate_key_count))
goto err;
DBUG_EXECUTE_IF("alter_table_only_metadata_change", {
if (need_copy_table_res != ALTER_TABLE_METADATA_ONLY)
goto err; });
DBUG_EXECUTE_IF("alter_table_only_index_change", {
if (need_copy_table_res != ALTER_TABLE_INDEX_CHANGED)
goto err; });
if (need_copy_table == ALTER_TABLE_METADATA_ONLY)
need_copy_table= need_copy_table_res;
}