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Experiments with the optimization of ORDER BY and GROUP BY clauses.

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FossilOrigin-Name: b150902579d708b454efd5f8750e26a816f7f1a6
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drh
2014-03-18 15:30:27 +00:00
parent 0e682099a1
commit 0401acec91
4 changed files with 47 additions and 49 deletions
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5
src/whereInt.h
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@@ -121,7 +121,7 @@ struct WhereLoop {
struct { /* Information for virtual tables */
int idxNum; /* Index number */
u8 needFree; /* True if sqlite3_free(idxStr) is needed */
u8 isOrdered; /* True if satisfies ORDER BY */
i8 isOrdered; /* True if satisfies ORDER BY */
u16 omitMask; /* Terms that may be omitted */
char *idxStr; /* Index identifier string */
} vtab;
@@ -183,8 +183,7 @@ struct WherePath {
Bitmask revLoop; /* aLoop[]s that should be reversed for ORDER BY */
LogEst nRow; /* Estimated number of rows generated by this path */
LogEst rCost; /* Total cost of this path */
u8 isOrdered; /* True if this path satisfies ORDER BY */
u8 isOrderedValid; /* True if the isOrdered field is valid */
i8 isOrdered; /* No. of ORDER BY terms satisfied. -1 for unknown */
WhereLoop **aLoop; /* Array of WhereLoop objects implementing this path */
};