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Bug#41660: Sort-index_merge for non-first join table may

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require O(#scans) memory

When an index merge operation was restarted, it would
re-allocate the Unique object controlling the duplicate row
ID elimination. Fixed by making the Unique object a member
of QUICK_INDEX_MERGE_SELECT and thus reusing it throughout
the lifetime of this object.
This commit is contained in:
Martin Hansson
2010-06-24 15:21:23 +02:00
parent f4420a3b90
commit 2b734bbee9
5 changed files with 88 additions and 19 deletions
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3
sql/sql_class.h
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@ -2935,6 +2935,9 @@ public:
void reset();
bool walk(tree_walk_action action, void *walk_action_arg);
uint get_size() const { return size; }
ulonglong get_max_in_memory_size() const { return max_in_memory_size; }
friend int unique_write_to_file(uchar* key, element_count count, Unique *unique);
friend int unique_write_to_ptrs(uchar* key, element_count count, Unique *unique);
};