database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-06 15:49:35 +03:00
Code Activity

Improved processing of DISTINCT.

Browse Source 
FossilOrigin-Name: ba897100fed291d2025f68d09334f9985312298b
This commit is contained in:
drh
2013-06-11 18:59:38 +00:00
parent 8e23daf372
commit 4f402f26b1
5 changed files with 100 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/sqliteInt.h
View File

@@ -1967,8 +1967,10 @@ struct SrcList {
#define WHERE_ONETABLE_ONLY 0x0040 /* Only code the 1st table in pTabList */
#define WHERE_AND_ONLY 0x0080 /* Don't use indices for OR terms */
#define WHERE_GROUPBY 0x0100 /* pOrderBy is really a GROUP BY */
#define WHERE_DISTINCTBY 0x0200 /* pOrderby is really a DISTINCT clause */
/* Allowed values for WhereInfo.eDistinct and DistinctCtx.eTnctType */
/* Allowed return values from sqlite3WhereIsDistinct()
*/
#define WHERE_DISTINCT_NOOP 0 /* DISTINCT keyword not used */
#define WHERE_DISTINCT_UNIQUE 1 /* No duplicates */
#define WHERE_DISTINCT_ORDERED 2 /* All duplicates are adjacent */
@@ -2226,7 +2228,7 @@ struct Parse {
/* Information used while coding trigger programs. */
Parse *pToplevel; /* Parse structure for main program (or NULL) */
Table *pTriggerTab; /* Table triggers are being coded for */
u32 grep nQueryLoop; /* Est number of iterations of a query (10*log2(N)) */
u32 nQueryLoop; /* Est number of iterations of a query (10*log2(N)) */
u32 oldmask; /* Mask of old.* columns referenced */
u32 newmask; /* Mask of new.* columns referenced */
u8 eTriggerOp; /* TK_UPDATE, TK_INSERT or TK_DELETE */