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Experimental implementation of NULLS FIRST/LAST. This branch still has problems - the most significant of which is that ORDER BY clauses with a non-default NULLS FIRST/LAST qualifier can never use an index.

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FossilOrigin-Name: 07babb0f897fc8c9cb5b30481899c32fdd743f3f3ca508d8d957826252107dd5
This commit is contained in:
dan
2019-08-12 16:36:38 +00:00
parent 41428a97b8
commit 6e11892db8
14 changed files with 171 additions and 64 deletions
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9
src/sqliteInt.h
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@@ -2134,10 +2134,13 @@ struct KeyInfo {
u16 nKeyField; /* Number of key columns in the index */
u16 nAllField; /* Total columns, including key plus others */
sqlite3 *db; /* The database connection */
u8 *aSortOrder; /* Sort order for each column. */
u8 *aSortFlags; /* Sort order for each column. */
CollSeq *aColl[1]; /* Collating sequence for each term of the key */
};
#define KEYINFO_ORDER_DESC 0x01
#define KEYINFO_ORDER_BIGNULL 0x02
/*
** This object holds a record which has been parsed out into individual
** fields, for the purposes of doing a comparison.
@@ -2597,7 +2600,7 @@ struct ExprList {
Expr *pExpr; /* The parse tree for this expression */
char *zName; /* Token associated with this expression */
char *zSpan; /* Original text of the expression */
u8 sortOrder; /* 1 for DESC or 0 for ASC */
u8 sortFlags; /* 1 for DESC or 0 for ASC */
unsigned done :1; /* A flag to indicate when processing is finished */
unsigned bSpanIsTab :1; /* zSpan holds DB.TABLE.COLUMN */
unsigned reusable :1; /* Constant expression is reusable */
@@ -3881,7 +3884,7 @@ void sqlite3ExprDelete(sqlite3*, Expr*);
void sqlite3ExprUnmapAndDelete(Parse*, Expr*);
ExprList *sqlite3ExprListAppend(Parse*,ExprList*,Expr*);
ExprList *sqlite3ExprListAppendVector(Parse*,ExprList*,IdList*,Expr*);
void sqlite3ExprListSetSortOrder(ExprList*,int);
void sqlite3ExprListSetSortOrder(ExprList*,int,int);
void sqlite3ExprListSetName(Parse*,ExprList*,Token*,int);
void sqlite3ExprListSetSpan(Parse*,ExprList*,const char*,const char*);
void sqlite3ExprListDelete(sqlite3*, ExprList*);