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Fixed bug mdev-4063 (bug #56927).

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This bug could result in returning 0 for the expressions of the form 
<aggregate_function>(distinct field) when the system variable  
max_heap_table_size was set to a small enough number.
It happened because the method Unique::walk() did not support
the case when more than one pass was needed to merge the trees
of distinct values saved in an external file.

Backported a fix in grant_lowercase.test from mariadb 5.5.
This commit is contained in:
Igor Babaev
2013-01-21 11:47:45 -08:00
parent 2e11ca36f2
commit fade3647ec
6 changed files with 146 additions and 69 deletions
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4
sql/sql_class.h
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@ -3008,6 +3008,8 @@ class Unique :public Sql_alloc
bool flush();
uint size;
bool merge(TABLE *table, uchar *buff, bool without_last_merge);
public:
ulong elements;
Unique(qsort_cmp2 comp_func, void *comp_func_fixed_arg,
@ -3035,7 +3037,7 @@ public:
}
void reset();
bool walk(tree_walk_action action, void *walk_action_arg);
bool walk(TABLE *table, 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; }