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Added Unique class to be used for duplicate removal in multi-table delete.

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monty@donna.mysql.fi
2001-05-23 23:47:08 +03:00
parent 8685094e15
commit 02f007436f
9 changed files with 308 additions and 69 deletions
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29
sql/sql_class.h
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@ -567,3 +567,32 @@ class user_var_entry
Item_result type;
};
/* Class for unique (removing of duplicates) */
class Unique :public Sql_alloc
{
DYNAMIC_ARRAY file_ptrs;
ulong max_elements, max_in_memory_size;
IO_CACHE file;
TREE tree;
char *record_pointers;
bool flush();
public:
ulong elements;
Unique(qsort_cmp2 comp_func, uint size, ulong max_in_memory_size_arg);
~Unique();
inline bool Unique::unique_add(gptr ptr)
{
if (tree.elements_in_tree > max_elements && flush())
return 1;
return tree_insert(&tree,ptr,0);
}
bool get(TABLE *table);
friend int unique_write_to_file(gptr key, Unique *unique,
element_count count);
friend int unique_write_to_ptrs(gptr key, Unique *unique,
element_count count);
};