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Overview
Comment: | Minor optimization in sqlite3WindowCodeStep(). |
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Downloads: | Tarball | ZIP archive | SQL archive |
Timelines: | family | ancestors | descendants | both | window-functions |
Files: | files | file ages | folders |
SHA3-256: |
b1322ffb6e63a110998068bf4f0a9030 |
User & Date: | dan 2019-03-13 08:28:51 |
Wiki: | window-functions |
Context
2019-03-13
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15:29 | Remove rows from the ephemeral table used by window functions once they are no longer required. check-in: 6ad5531920 user: dan tags: window-functions | |
08:28 | Minor optimization in sqlite3WindowCodeStep(). check-in: b1322ffb6e user: dan tags: window-functions | |
2019-03-12
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18:28 | Allow real values to be used in PRECEDING and FOLLOWING expressions for RANGE window frames. check-in: 25ff7091cb user: dan tags: window-functions | |
Changes
Changes to src/window.c.
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WhereInfo *pWInfo, /* Context returned by sqlite3WhereBegin() */ int regGosub, /* Register for OP_Gosub */ int addrGosub /* OP_Gosub here to return each row */ ){ Window *pMWin = p->pWin; ExprList *pOrderBy = pMWin->pOrderBy; Vdbe *v = sqlite3GetVdbe(pParse); int regFlushPart; /* Register for "Gosub flush_partition" */ int csrWrite; /* Cursor used to write to eph. table */ int csrInput = p->pSrc->a[0].iCursor; /* Cursor of sub-select */ int nInput = p->pSrc->a[0].pTab->nCol; /* Number of cols returned by sub */ int iInput; /* To iterate through sub cols */ int addrIfNot; /* Address of OP_IfNot */ int addrGosubFlush; /* Address of OP_Gosub to flush: */ int addrInteger; /* Address of OP_Integer */ int addrEmpty = 0; /* Address of OP_Rewind in flush: */ int regStart = 0; /* Value of <expr> PRECEDING */ int regEnd = 0; /* Value of <expr> FOLLOWING */ int regNew; /* Array of registers holding new input row */ int regRecord; /* regNew array in record form */ int regRowid; /* Rowid for regRecord in eph table */ int regNewPeer = 0; /* Peer values for new row (part of regNew) */ int regPeer = 0; /* Peer values for current row */ WindowCodeArg s; /* Context object for sub-routines */ int lblWhereEnd; /* Label just before sqlite3WhereEnd() code */ assert( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_CURRENT || pMWin->eStart==TK_FOLLOWING || pMWin->eStart==TK_UNBOUNDED ); assert( pMWin->eEnd==TK_FOLLOWING || pMWin->eEnd==TK_CURRENT ................................................................................ s.regGosub = regGosub; s.addrGosub = addrGosub; s.current.csr = pMWin->iEphCsr; csrWrite = s.current.csr+1; s.start.csr = s.current.csr+2; s.end.csr = s.current.csr+3; regNew = pParse->nMem+1; pParse->nMem += nInput; regRecord = ++pParse->nMem; regRowid = ++pParse->nMem; regFlushPart = ++pParse->nMem; /* If the window frame contains an "<expr> PRECEDING" or "<expr> FOLLOWING" ** clause, allocate registers to store the results of evaluating each ** <expr>. */ if( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_FOLLOWING ){ regStart = ++pParse->nMem; } ................................................................................ if( pMWin->pPartition ){ int addr; ExprList *pPart = pMWin->pPartition; int nPart = pPart->nExpr; int regNewPart = regNew + pMWin->nBufferCol; KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pPart, 0, 0); addr = sqlite3VdbeAddOp3(v, OP_Compare, regNewPart, pMWin->regPart, nPart); sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO); sqlite3VdbeAddOp3(v, OP_Jump, addr+2, addr+4, addr+2); VdbeCoverageEqNe(v); addrGosubFlush = sqlite3VdbeAddOp1(v, OP_Gosub, regFlushPart); VdbeComment((v, "call flush_partition")); sqlite3VdbeAddOp3(v, OP_Copy, regNewPart, pMWin->regPart, nPart-1); |
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WhereInfo *pWInfo, /* Context returned by sqlite3WhereBegin() */ int regGosub, /* Register for OP_Gosub */ int addrGosub /* OP_Gosub here to return each row */ ){ Window *pMWin = p->pWin; ExprList *pOrderBy = pMWin->pOrderBy; Vdbe *v = sqlite3GetVdbe(pParse); int csrWrite; /* Cursor used to write to eph. table */ int csrInput = p->pSrc->a[0].iCursor; /* Cursor of sub-select */ int nInput = p->pSrc->a[0].pTab->nCol; /* Number of cols returned by sub */ int iInput; /* To iterate through sub cols */ int addrIfNot; /* Address of OP_IfNot */ int addrGosubFlush; /* Address of OP_Gosub to flush: */ int addrInteger; /* Address of OP_Integer */ int addrEmpty; /* Address of OP_Rewind in flush: */ int regStart = 0; /* Value of <expr> PRECEDING */ int regEnd = 0; /* Value of <expr> FOLLOWING */ int regNew; /* Array of registers holding new input row */ int regRecord; /* regNew array in record form */ int regRowid; /* Rowid for regRecord in eph table */ int regNewPeer = 0; /* Peer values for new row (part of regNew) */ int regPeer = 0; /* Peer values for current row */ int regFlushPart = 0; /* Register for "Gosub flush_partition" */ WindowCodeArg s; /* Context object for sub-routines */ int lblWhereEnd; /* Label just before sqlite3WhereEnd() code */ assert( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_CURRENT || pMWin->eStart==TK_FOLLOWING || pMWin->eStart==TK_UNBOUNDED ); assert( pMWin->eEnd==TK_FOLLOWING || pMWin->eEnd==TK_CURRENT ................................................................................ s.regGosub = regGosub; s.addrGosub = addrGosub; s.current.csr = pMWin->iEphCsr; csrWrite = s.current.csr+1; s.start.csr = s.current.csr+2; s.end.csr = s.current.csr+3; /* Allocate registers for the array of values from the sub-query, the ** samve values in record form, and the rowid used to insert said record ** into the ephemeral table. */ regNew = pParse->nMem+1; pParse->nMem += nInput; regRecord = ++pParse->nMem; regRowid = ++pParse->nMem; /* If the window frame contains an "<expr> PRECEDING" or "<expr> FOLLOWING" ** clause, allocate registers to store the results of evaluating each ** <expr>. */ if( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_FOLLOWING ){ regStart = ++pParse->nMem; } ................................................................................ if( pMWin->pPartition ){ int addr; ExprList *pPart = pMWin->pPartition; int nPart = pPart->nExpr; int regNewPart = regNew + pMWin->nBufferCol; KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pPart, 0, 0); regFlushPart = ++pParse->nMem; addr = sqlite3VdbeAddOp3(v, OP_Compare, regNewPart, pMWin->regPart, nPart); sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO); sqlite3VdbeAddOp3(v, OP_Jump, addr+2, addr+4, addr+2); VdbeCoverageEqNe(v); addrGosubFlush = sqlite3VdbeAddOp1(v, OP_Gosub, regFlushPart); VdbeComment((v, "call flush_partition")); sqlite3VdbeAddOp3(v, OP_Copy, regNewPart, pMWin->regPart, nPart-1); |