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cheat when all parts of count(distinct) key are binary

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sasha@mysql.sashanet.com 2001-05-29 19:19:18 -06:00
parent 6ecaac01f0
commit 196e995caf
1 changed files with 13 additions and 2 deletions
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15
sql/item_sum.cc
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@ -926,15 +926,26 @@ bool Item_sum_count_distinct::setup(THD *thd)
} }
else // too bad, cannot cheat - there is more than one field else // too bad, cannot cheat - there is more than one field
{ {
cmp_arg = (void*)this; bool all_binary = 1;
compare_key = (qsort_cmp2)composite_key_cmp;
Field** field, **field_end; Field** field, **field_end;
field_end = (field = table->field) + table->fields; field_end = (field = table->field) + table->fields;
for(key_len = 0; field < field_end; ++field) for(key_len = 0; field < field_end; ++field)
{ {
key_len += (*field)->field_length; key_len += (*field)->field_length;
if(!(*field)->binary())
all_binary = 0;
} }
rec_offset = table->reclength - key_len; rec_offset = table->reclength - key_len;
if(all_binary)
{
compare_key = (qsort_cmp2)simple_raw_key_cmp;
cmp_arg = (void*)key_len;
}
else
{
compare_key = (qsort_cmp2)composite_key_cmp ;
cmp_arg = (void*)this;
}
} }
init_tree(&tree, min(max_heap_table_size, sortbuff_size/16), init_tree(&tree, min(max_heap_table_size, sortbuff_size/16),