From d7c781a91f632506be0486f02dac29834ae5722f Mon Sep 17 00:00:00 2001 From: unknown Date: Fri, 19 Dec 2003 19:04:03 +0300 Subject: Implementation of SUM(DISTINCT), tests cases sql/filesort.cc: Snippet of filesort() code moved to function reuse_freed_buff() - change buffpek pointers to use buff from freed BUFFPEK Used in filesort() and merge_walk(). sql/item_sum.cc: Implementation of Item_sum_sum_distinct - SUM(DISTINCT) item, which uses Unique to resolve duplicates sql/item_sum.h: New sum Item added - Item_sum_sum_distinct - for SUM(DISTINCT) function sql/sql_class.h: added walk() and reset() methods to Unique, used in Item_sum_sum_distinct. sql/sql_sort.h: declaration for reuse_freed_buff() to be able to use it in uniques.cc sql/sql_yacc.yy: parser extended to handle MIN(DISTICNT), MAX(DISTINCT), SUM(DISTINCT) sql/uniques.cc: Implementation for Unique::reset(), Unique::walk() as well as for merge_walk() algorithm. --- sql/sql_sort.h | 1 + 1 file changed, 1 insertion(+) (limited to 'sql/sql_sort.h') diff --git a/sql/sql_sort.h b/sql/sql_sort.h index 9f95ffa4884..1831c4a2f3d 100644 --- a/sql/sql_sort.h +++ b/sql/sql_sort.h @@ -78,3 +78,4 @@ int merge_buffers(SORTPARAM *param,IO_CACHE *from_file, IO_CACHE *to_file, uchar *sort_buffer, BUFFPEK *lastbuff,BUFFPEK *Fb, BUFFPEK *Tb,int flag); +void reuse_freed_buff(QUEUE *queue, BUFFPEK *reuse, uint key_length); -- cgit v1.2.1