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Consolidate more of the DISTINCT processing logic into a single spot in the

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code.  Reduce the number of OP_Column operations needed to perform a
WHERE_DISTINCT_ORDERED.

FossilOrigin-Name: 79e922f7ae29bbe06d639d648fbd72523cf9a28e
This commit is contained in:
drh
2012-09-21 00:04:28 +00:00
parent 634d81dee0
commit e8e4af7697
7 changed files with 128 additions and 113 deletions
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10
src/sqliteInt.h
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@@ -1998,10 +1998,11 @@ struct WhereInfo {
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 */
/* Allowed values for WhereInfo.eDistinct and DistinctCtx.eTnctType */
#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 */
#define WHERE_DISTINCT_UNORDERED 3 /* Duplicates are scattered */
/*
** A NameContext defines a context in which to resolve table and column
@@ -2816,7 +2817,6 @@ void sqlite3WhereEnd(WhereInfo*);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, u8);
void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);
void sqlite3ExprCodeMove(Parse*, int, int, int);
void sqlite3ExprCodeCopy(Parse*, int, int, int);
void sqlite3ExprCacheStore(Parse*, int, int, int);
void sqlite3ExprCachePush(Parse*);
void sqlite3ExprCachePop(Parse*, int);