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merging.

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This commit is contained in:
Alexey Botchkov 2009-11-17 15:24:23 +04:00
commit 5b8a24cf04
2 changed files with 16 additions and 3 deletions
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18
sql/item_sum.cc
View File

@ -28,6 +28,18 @@
#include "mysql_priv.h"
#include "sql_select.h"
/**
Calculate the affordable RAM limit for structures like TREE or Unique
used in Item_sum_*
*/
ulonglong Item_sum::ram_limitation(THD *thd)
{
return min(thd->variables.tmp_table_size,
thd->variables.max_heap_table_size);
}
/**
Prepare an aggregate function item for checking context conditions.
@ -833,7 +845,7 @@ bool Aggregator_distinct::setup(THD *thd)
}
DBUG_ASSERT(tree == 0);
tree= new Unique(compare_key, cmp_arg, tree_key_length,
thd->variables.max_heap_table_size);
item_sum->ram_limitation(thd));
/*
The only time tree_key_length could be 0 is if someone does
count(distinct) on a char(0) field - stupid thing to do,
@ -902,7 +914,7 @@ bool Aggregator_distinct::setup(THD *thd)
are converted to binary representation as well.
*/
tree= new Unique(simple_raw_key_cmp, &tree_key_length, tree_key_length,
thd->variables.max_heap_table_size);
item_sum->ram_limitation(thd));
DBUG_RETURN(tree == 0);
}
@ -3514,7 +3526,7 @@ bool Item_func_group_concat::setup(THD *thd)
unique_filter= new Unique(group_concat_key_cmp_with_distinct,
(void*)this,
tree_key_length,
thd->variables.max_heap_table_size);
ram_limitation(thd));
DBUG_RETURN(FALSE);
}

1
sql/item_sum.h
View File

@ -364,6 +364,7 @@ protected:
Item **orig_args, *tmp_orig_args[2];
table_map used_tables_cache;
bool forced_const;
static ulonglong ram_limitation(THD *thd);
public: