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Allow the "order=DESC" and "order=ASC" parameters in FTS4 "CREATE VIRTUAL TABLE" statements. Tables created with "order=DESC" store all doclists in descending order, which allows optimizations normally applied to "ORDER BY docid ASC" queries to be used with "ORDER BY docid DESC" queries instead.

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FossilOrigin-Name: f6a0193f5a32603eb48bddc6297042dbd2ffe96e
This commit is contained in:
dan
2011-06-04 20:04:35 +00:00
parent 126ba6c0ac
commit b46ee91729
6 changed files with 682 additions and 303 deletions
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5
ext/fts3/fts3Int.h
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@ -180,6 +180,7 @@ struct Fts3Table {
int nNodeSize; /* Soft limit for node size */
u8 bHasStat; /* True if %_stat table exists */
u8 bHasDocsize; /* True if %_docsize table exists */
u8 bDescIdx; /* True if doclists are in reverse order */
int nPgsz; /* Page size for host database */
char *zSegmentsTbl; /* Name of %_segments table */
sqlite3_blob *pSegments; /* Blob handle open on %_segments table */
@ -236,7 +237,7 @@ struct Fts3Cursor {
char *pNextId; /* Pointer into the body of aDoclist */
char *aDoclist; /* List of docids for full-text queries */
int nDoclist; /* Size of buffer at aDoclist */
int bDesc; /* True to sort in descending order */
u8 bDesc; /* True to sort in descending order */
int eEvalmode; /* An FTS3_EVAL_XX constant */
int nRowAvg; /* Average size of database rows, in pages */
@ -438,6 +439,7 @@ int sqlite3Fts3GetVarint(const char *, sqlite_int64 *);
int sqlite3Fts3GetVarint32(const char *, int *);
int sqlite3Fts3VarintLen(sqlite3_uint64);
void sqlite3Fts3Dequote(char *);
void sqlite3Fts3DoclistPrev(int,char*,int,char**,sqlite3_int64*,int*,u8*);
int sqlite3Fts3ExprLoadDoclist(Fts3Cursor *, Fts3Expr *);
int sqlite3Fts3ExprNearTrim(Fts3Expr *, Fts3Expr *, int);
@ -495,4 +497,5 @@ int sqlite3Fts3MsrOvfl(Fts3Cursor *, Fts3MultiSegReader *, int *);
int sqlite3Fts3DeferredTokenList(Fts3DeferredToken *, char **, int *);
#endif /* _FTSINT_H */