diff options
Diffstat (limited to 'src/sqliteInt.h')
| -rw-r--r-- | src/sqliteInt.h | 61 |
1 files changed, 52 insertions, 9 deletions
diff --git a/src/sqliteInt.h b/src/sqliteInt.h index 7b19e0a98..8a1376fd2 100644 --- a/src/sqliteInt.h +++ b/src/sqliteInt.h @@ -1107,6 +1107,7 @@ typedef struct VTable VTable; typedef struct VtabCtx VtabCtx; typedef struct Walker Walker; typedef struct WhereInfo WhereInfo; +typedef struct Window Window; typedef struct With With; /* A VList object records a mapping between parameters/variables/wildcards @@ -1588,6 +1589,8 @@ struct FuncDef { FuncDef *pNext; /* Next function with same name */ void (*xSFunc)(sqlite3_context*,int,sqlite3_value**); /* func or agg-step */ void (*xFinalize)(sqlite3_context*); /* Agg finalizer */ + void (*xValue)(sqlite3_context*); /* Current agg value */ + void (*xInverse)(sqlite3_context*,int,sqlite3_value**); /* inverse agg-step */ const char *zName; /* SQL name of the function. */ union { FuncDef *pHash; /* Next with a different name but the same hash */ @@ -1678,6 +1681,12 @@ struct FuncDestructor { ** are interpreted in the same way as the first 4 parameters to ** FUNCTION(). ** +** WFUNCTION(zName, nArg, iArg, xStep, xFinal, xValue, xInverse) +** Used to create an aggregate function definition implemented by +** the C functions xStep and xFinal. The first four parameters +** are interpreted in the same way as the first 4 parameters to +** FUNCTION(). +** ** LIKEFUNC(zName, nArg, pArg, flags) ** Used to create a scalar function definition of a function zName ** that accepts nArg arguments and is implemented by a call to C @@ -1688,31 +1697,35 @@ struct FuncDestructor { */ #define FUNCTION(zName, nArg, iArg, bNC, xFunc) \ {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \ - SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, {0} } + SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, 0, #zName, {0} } #define VFUNCTION(zName, nArg, iArg, bNC, xFunc) \ {nArg, SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \ - SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, {0} } + SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, 0, #zName, {0} } #define DFUNCTION(zName, nArg, iArg, bNC, xFunc) \ {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8, \ - 0, 0, xFunc, 0, #zName, {0} } + 0, 0, xFunc, 0, 0, 0, #zName, {0} } #define PURE_DATE(zName, nArg, iArg, bNC, xFunc) \ {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|SQLITE_FUNC_CONSTANT, \ - (void*)&sqlite3Config, 0, xFunc, 0, #zName, {0} } + (void*)&sqlite3Config, 0, xFunc, 0, 0, 0, #zName, {0} } #define FUNCTION2(zName, nArg, iArg, bNC, xFunc, extraFlags) \ {nArg,SQLITE_FUNC_CONSTANT|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL)|extraFlags,\ - SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, #zName, {0} } + SQLITE_INT_TO_PTR(iArg), 0, xFunc, 0, 0, 0, #zName, {0} } #define STR_FUNCTION(zName, nArg, pArg, bNC, xFunc) \ {nArg, SQLITE_FUNC_SLOCHNG|SQLITE_UTF8|(bNC*SQLITE_FUNC_NEEDCOLL), \ - pArg, 0, xFunc, 0, #zName, } + pArg, 0, xFunc, 0, 0, 0, #zName, } #define LIKEFUNC(zName, nArg, arg, flags) \ {nArg, SQLITE_FUNC_CONSTANT|SQLITE_UTF8|flags, \ - (void *)arg, 0, likeFunc, 0, #zName, {0} } + (void *)arg, 0, likeFunc, 0, 0, 0, #zName, {0} } #define AGGREGATE(zName, nArg, arg, nc, xStep, xFinal) \ {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL), \ - SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName, {0}} + SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,0,0,#zName, {0}} #define AGGREGATE2(zName, nArg, arg, nc, xStep, xFinal, extraFlags) \ {nArg, SQLITE_UTF8|(nc*SQLITE_FUNC_NEEDCOLL)|extraFlags, \ - SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,#zName, {0}} + SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,0,0,#zName, {0}} + +#define WFUNCTION(zName, nArg, arg, xStep, xFinal, xValue, xInverse) \ + {nArg, SQLITE_UTF8, \ + SQLITE_INT_TO_PTR(arg), 0, xStep,xFinal,xValue,xInverse,#zName, {0}} /* ** All current savepoints are stored in a linked list starting at @@ -2413,6 +2426,7 @@ struct Expr { AggInfo *pAggInfo; /* Used by TK_AGG_COLUMN and TK_AGG_FUNCTION */ Table *pTab; /* Table for TK_COLUMN expressions. Can be NULL ** for a column of an index on an expression */ + Window *pWin; /* Window definition for window functions */ }; /* @@ -2699,6 +2713,7 @@ 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 */ }; /* @@ -2721,6 +2736,7 @@ struct NameContext { #define NC_UUpsert 0x0200 /* True if uNC.pUpsert is used */ #define NC_MinMaxAgg 0x1000 /* min/max aggregates seen. See note above */ #define NC_Complex 0x2000 /* True if a function or subquery seen */ +#define NC_AllowWin 0x4000 /* Window functions are allowed here */ /* ** An instance of the following object describes a single ON CONFLICT @@ -2788,6 +2804,7 @@ struct Select { Select *pNext; /* Next select to the left in a compound */ Expr *pLimit; /* LIMIT expression. NULL means not used. */ With *pWith; /* WITH clause attached to this select. Or NULL. */ + Window *pWin; /* List of window functions */ }; /* @@ -3401,6 +3418,7 @@ struct Walker { struct IdxExprTrans *pIdxTrans; /* Convert idxed expr to column */ ExprList *pGroupBy; /* GROUP BY clause */ Select *pSelect; /* HAVING to WHERE clause ctx */ + struct WindowRewrite *pRewrite; /* Window rewrite context */ } u; }; @@ -3451,6 +3469,31 @@ struct TreeView { }; #endif /* SQLITE_DEBUG */ +struct Window { + Expr *pFilter; + ExprList *pPartition; + ExprList *pOrderBy; + 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 */ + int iEphCsr; /* Temp table used by this window */ + int regAccum; + int regResult; + FuncDef *pFunc; + int nArg; + + Expr *pOwner; /* Expression object this window is attached to */ + int nBufferCol; /* Number of columns in buffer table */ + int iArgCol; /* Offset of first argument for this function */ +}; + +void sqlite3WindowDelete(sqlite3*, Window*); +Window *sqlite3WindowAlloc(Parse*, int, int, Expr*, int , Expr*); +void sqlite3WindowAttach(Parse*, Expr*, Window*); + /* ** Assuming zIn points to the first byte of a UTF-8 character, ** advance zIn to point to the first byte of the next UTF-8 character. |