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Overview
| Comment: | Add comments to the WHERE_DISTINCT_* macros. No changes to code. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
82320501904f65030622a67836ba30f4 |
| User & Date: | drh 2012-09-19 17:31:15 |
Context
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2012-09-19
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| 21:15 | Tighter VDBE code for the WHERE_DISTINCT_ORDERED case of DISTINCT keyword handling. check-in: 94b48064 user: drh tags: trunk | |
| 17:31 | Add comments to the WHERE_DISTINCT_* macros. No changes to code. check-in: 82320501 user: drh tags: trunk | |
| 00:35 | Merge the covering-index-scan optimization into trunk. check-in: ddd5d789 user: drh tags: trunk | |
Changes
Changes to src/sqliteInt.h.
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** into the second half to give some continuity.
*/
struct WhereInfo {
Parse *pParse; /* Parsing and code generating context */
u16 wctrlFlags; /* Flags originally passed to sqlite3WhereBegin() */
u8 okOnePass; /* Ok to use one-pass algorithm for UPDATE or DELETE */
u8 untestedTerms; /* Not all WHERE terms resolved by outer loop */
u8 eDistinct;
SrcList *pTabList; /* List of tables in the join */
int iTop; /* The very beginning of the WHERE loop */
int iContinue; /* Jump here to continue with next record */
int iBreak; /* Jump here to break out of the loop */
int nLevel; /* Number of nested loop */
struct WhereClause *pWC; /* Decomposition of the WHERE clause */
double savedNQueryLoop; /* pParse->nQueryLoop outside the WHERE loop */
double nRowOut; /* Estimated number of output rows */
WhereLevel a[1]; /* Information about each nest loop in WHERE */
};
#define WHERE_DISTINCT_UNIQUE 1
#define WHERE_DISTINCT_ORDERED 2
/*
** A NameContext defines a context in which to resolve table and column
** names. The context consists of a list of tables (the pSrcList) field and
** a list of named expression (pEList). The named expression list may
** be NULL. The pSrc corresponds to the FROM clause of a SELECT or
** to the table being operated on by INSERT, UPDATE, or DELETE. The
|
| > > | | |
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 |
** into the second half to give some continuity.
*/
struct WhereInfo {
Parse *pParse; /* Parsing and code generating context */
u16 wctrlFlags; /* Flags originally passed to sqlite3WhereBegin() */
u8 okOnePass; /* Ok to use one-pass algorithm for UPDATE or DELETE */
u8 untestedTerms; /* Not all WHERE terms resolved by outer loop */
u8 eDistinct; /* One of the WHERE_DISTINCT_* values below */
SrcList *pTabList; /* List of tables in the join */
int iTop; /* The very beginning of the WHERE loop */
int iContinue; /* Jump here to continue with next record */
int iBreak; /* Jump here to break out of the loop */
int nLevel; /* Number of nested loop */
struct WhereClause *pWC; /* Decomposition of the WHERE clause */
double savedNQueryLoop; /* pParse->nQueryLoop outside the WHERE loop */
double nRowOut; /* Estimated number of output rows */
WhereLevel a[1]; /* Information about each nest loop in WHERE */
};
/* Allowed values for WhereInfo.eDistinct */
#define WHERE_DISTINCT_NOT 0 /* May contain non-adjacent duplicates */
#define WHERE_DISTINCT_UNIQUE 1 /* No duplicates */
#define WHERE_DISTINCT_ORDERED 2 /* All duplicates are adjacent */
/*
** A NameContext defines a context in which to resolve table and column
** names. The context consists of a list of tables (the pSrcList) field and
** a list of named expression (pEList). The named expression list may
** be NULL. The pSrc corresponds to the FROM clause of a SELECT or
** to the table being operated on by INSERT, UPDATE, or DELETE. The
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