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Add support for the WINDOW clause.

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FossilOrigin-Name: 19c983b511f1c823fdfb051713681b4c779f02fa83b41189afca0a9b8b72048d
This commit is contained in:
dan
2018-06-08 20:58:27 +00:00
parent dacf1de95c
commit e3bf632cc2
12 changed files with 136 additions and 39 deletions
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15
src/sqliteInt.h
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@@ -2715,7 +2715,7 @@ struct NameContext {
int nRef; /* Number of names resolved by this context */
int nErr; /* Number of errors encountered while resolving names */
u16 ncFlags; /* Zero or more NC_* flags defined below */
Window *pWin; /* List of window functions in this context */
Select *pWinSelect; /* SELECT statement for any window functions */
};
/*
@@ -2807,6 +2807,7 @@ struct Select {
Expr *pLimit; /* LIMIT expression. NULL means not used. */
With *pWith; /* WITH clause attached to this select. Or NULL. */
Window *pWin; /* List of window functions */
Window *pWinDefn; /* List of named window definitions */
};
/*
@@ -3472,15 +3473,18 @@ struct TreeView {
#endif /* SQLITE_DEBUG */
struct Window {
Expr *pFilter;
ExprList *pPartition;
ExprList *pOrderBy;
char *zName; /* Name of window (may be NULL) */
ExprList *pPartition; /* PARTITION BY clause */
ExprList *pOrderBy; /* ORDER BY clause */
u8 eType; /* TK_RANGE or TK_ROWS */
u8 eStart; /* UNBOUNDED, CURRENT, PRECEDING or FOLLOWING */
u8 eEnd; /* UNBOUNDED, CURRENT, PRECEDING or FOLLOWING */
Expr *pStart; /* Expression for "<expr> PRECEDING" */
Expr *pEnd; /* Expression for "<expr> FOLLOWING" */
Window *pNextWin; /* Next window function belonging to this SELECT */
Expr *pFilter;
FuncDef *pFunc;
int nArg;
@@ -3498,6 +3502,7 @@ struct Window {
};
void sqlite3WindowDelete(sqlite3*, Window*);
void sqlite3WindowListDelete(sqlite3 *db, Window *p);
Window *sqlite3WindowAlloc(Parse*, int, int, Expr*, int , Expr*);
void sqlite3WindowAttach(Parse*, Expr*, Window*);
int sqlite3WindowCompare(Parse*, Window*, Window*);
@@ -3505,7 +3510,7 @@ void sqlite3WindowCodeInit(Parse*, Window*);
void sqlite3WindowCodeStep(Parse*, Select*, WhereInfo*, int, int);
int sqlite3WindowRewrite(Parse*, Select*);
int sqlite3ExpandSubquery(Parse*, struct SrcList_item*);
void sqlite3WindowUpdate(Parse*, Window*, FuncDef*);
void sqlite3WindowUpdate(Parse*, Window*, Window*, FuncDef*);
Window *sqlite3WindowDup(sqlite3 *db, Window *p);
/*