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Overview
Comment: | Finish consolidation of window frame code. Add untested support for GROUPS frames. |
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Downloads: | Tarball | ZIP archive | SQL archive |
Timelines: | family | ancestors | descendants | both | window-functions |
Files: | files | file ages | folders |
SHA3-256: |
954bf369935083c188c3b14e77ed89fc |
User & Date: | dan 2019-03-08 20:02:52 |
Wiki: | window-functions |
Context
2019-03-08
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20:57 | Add simple tests for GROUPS window frames. check-in: 2872702dac user: dan tags: window-functions | |
20:02 | Finish consolidation of window frame code. Add untested support for GROUPS frames. check-in: 954bf36993 user: dan tags: window-functions | |
2019-03-07
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20:47 | Fix other "ROWS BETWEEN" cases on this branch. check-in: a5f68f6647 user: dan tags: window-functions | |
Changes
Changes to src/parse.y.
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} frame_opt(A) ::= range_or_rows(X) BETWEEN frame_bound_s(Y) AND frame_bound_e(Z). { A = sqlite3WindowAlloc(pParse, X, Y.eType, Y.pExpr, Z.eType, Z.pExpr); } range_or_rows(A) ::= RANGE. { A = TK_RANGE; } range_or_rows(A) ::= ROWS. { A = TK_ROWS; } frame_bound_s(A) ::= frame_bound(X). { A = X; } frame_bound_s(A) ::= UNBOUNDED PRECEDING. {A.eType = TK_UNBOUNDED; A.pExpr = 0;} frame_bound_e(A) ::= frame_bound(X). { A = X; } frame_bound_e(A) ::= UNBOUNDED FOLLOWING. {A.eType = TK_UNBOUNDED; A.pExpr = 0;} |
> |
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}
frame_opt(A) ::= range_or_rows(X) BETWEEN frame_bound_s(Y) AND frame_bound_e(Z). {
A = sqlite3WindowAlloc(pParse, X, Y.eType, Y.pExpr, Z.eType, Z.pExpr);
}
range_or_rows(A) ::= RANGE. { A = TK_RANGE; }
range_or_rows(A) ::= ROWS. { A = TK_ROWS; }
range_or_rows(A) ::= GROUPS. { A = TK_GROUPS;}
frame_bound_s(A) ::= frame_bound(X). { A = X; }
frame_bound_s(A) ::= UNBOUNDED PRECEDING. {A.eType = TK_UNBOUNDED; A.pExpr = 0;}
frame_bound_e(A) ::= frame_bound(X). { A = X; }
frame_bound_e(A) ::= UNBOUNDED FOLLOWING. {A.eType = TK_UNBOUNDED; A.pExpr = 0;}
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Changes to src/window.c.
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int eEnd, /* End type: CURRENT, FOLLOWING, TK_UNBOUNDED, PRECEDING */ Expr *pEnd /* End window size if TK_FOLLOWING or PRECEDING */ ){ Window *pWin = 0; int bImplicitFrame = 0; /* Parser assures the following: */ assert( eType==0 || eType==TK_RANGE || eType==TK_ROWS ); assert( eStart==TK_CURRENT || eStart==TK_PRECEDING || eStart==TK_UNBOUNDED || eStart==TK_FOLLOWING ); assert( eEnd==TK_CURRENT || eEnd==TK_FOLLOWING || eEnd==TK_UNBOUNDED || eEnd==TK_PRECEDING ); assert( (eStart==TK_PRECEDING || eStart==TK_FOLLOWING)==(pStart!=0) ); assert( (eEnd==TK_FOLLOWING || eEnd==TK_PRECEDING)==(pEnd!=0) ); ................................................................................ pWin->regResult); sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF); } } } } /* ** This function generates VM code to invoke the sub-routine at address ** lblFlushPart once for each partition with the entire partition cached in ** the Window.iEphCsr temp table. */ static void windowPartitionCache( Parse *pParse, Select *p, /* The rewritten SELECT statement */ WhereInfo *pWInfo, /* WhereInfo to call WhereEnd() on */ int regFlushPart, /* Register to use with Gosub lblFlushPart */ int lblFlushPart, /* Subroutine to Gosub to */ int *pRegSize /* OUT: Register containing partition size */ ){ Window *pMWin = p->pWin; Vdbe *v = sqlite3GetVdbe(pParse); int iSubCsr = p->pSrc->a[0].iCursor; int nSub = p->pSrc->a[0].pTab->nCol; int k; int reg = pParse->nMem+1; int regRecord = reg+nSub; int regRowid = regRecord+1; *pRegSize = regRowid; pParse->nMem += nSub + 2; /* Load the column values for the row returned by the sub-select ** into an array of registers starting at reg. */ for(k=0; k<nSub; k++){ sqlite3VdbeAddOp3(v, OP_Column, iSubCsr, k, reg+k); } sqlite3VdbeAddOp3(v, OP_MakeRecord, reg, nSub, regRecord); /* Check if this is the start of a new partition. If so, call the ** flush_partition sub-routine. */ if( pMWin->pPartition ){ int addr; ExprList *pPart = pMWin->pPartition; int nPart = pPart->nExpr; int regNewPart = reg + 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); sqlite3VdbeAddOp3(v, OP_Copy, regNewPart, pMWin->regPart, nPart-1); sqlite3VdbeAddOp2(v, OP_Gosub, regFlushPart, lblFlushPart); VdbeComment((v, "call flush_partition")); } /* Buffer the current row in the ephemeral table. */ sqlite3VdbeAddOp2(v, OP_NewRowid, pMWin->iEphCsr, regRowid); sqlite3VdbeAddOp3(v, OP_Insert, pMWin->iEphCsr, regRecord, regRowid); /* End of the input loop */ sqlite3WhereEnd(pWInfo); /* Invoke "flush_partition" to deal with the final (or only) partition */ sqlite3VdbeAddOp2(v, OP_Gosub, regFlushPart, lblFlushPart); VdbeComment((v, "call flush_partition")); } /* ** Invoke the sub-routine at regGosub (generated by code in select.c) to ** return the current row of Window.iEphCsr. If all window functions are ** aggregate window functions that use the standard API, a single ** OP_Gosub instruction is all that this routine generates. Extra VM code ** for per-row processing is only generated for the following built-in window ** functions: ................................................................................ sqlite3VdbeResolveLabel(v, lbl); sqlite3ReleaseTempReg(pParse, tmpReg); } } sqlite3VdbeAddOp2(v, OP_Gosub, regGosub, addrGosub); } /* ** Invoke the code generated by windowReturnOneRow() and, optionally, the ** xInverse() function for each window function, for one or more rows ** from the Window.iEphCsr temp table. This routine generates VM code ** similar to: ** ** while( regCtr>0 ){ ** regCtr--; ** windowReturnOneRow() ** if( bInverse ){ ** AggInverse ** } ** Next (Window.iEphCsr) ** } */ static void windowReturnRows( Parse *pParse, Window *pMWin, /* List of window functions */ int regCtr, /* Register containing number of rows */ int regGosub, /* Register for Gosub addrGosub */ int addrGosub, /* Address of sub-routine for ReturnOneRow */ int regInvArg, /* Array of registers for xInverse args */ int regInvSize /* Register containing size of partition */ ){ int addr; Vdbe *v = sqlite3GetVdbe(pParse); windowAggFinal(pParse, pMWin, 0); addr = sqlite3VdbeAddOp3(v, OP_IfPos, regCtr, sqlite3VdbeCurrentAddr(v)+2 ,1); VdbeCoverage(v); sqlite3VdbeAddOp2(v, OP_Goto, 0, 0); windowReturnOneRow(pParse, pMWin, regGosub, addrGosub); if( regInvArg ){ windowAggStep(pParse, pMWin, pMWin->iEphCsr, 1, regInvArg, regInvSize); } sqlite3VdbeAddOp2(v, OP_Next, pMWin->iEphCsr, addr); VdbeCoverage(v); sqlite3VdbeJumpHere(v, addr+1); /* The OP_Goto */ } /* ** Generate code to set the accumulator register for each window function ** in the linked list passed as the second argument to NULL. And perform ** any equivalent initialization required by any built-in window functions ** in the list. */ static int windowInitAccum(Parse *pParse, Window *pMWin){ ................................................................................ || (pFunc->zName==lagName) ){ return 1; } } return 0; } typedef struct WindowCodeArg WindowCodeArg; struct WindowCodeArg { Parse *pParse; Window *pMWin; Vdbe *pVdbe; int regGosub; int addrGosub; int regArg; }; #define WINDOW_RETURN_ROW 1 #define WINDOW_AGGINVERSE 2 #define WINDOW_AGGSTEP 3 static int windowCodeOp( WindowCodeArg *p, int op, int csr, int regCountdown, int jumpOnEof ){ Window *pMWin = p->pMWin; int ret = 0; Vdbe *v = p->pVdbe; int addrIf = 0; /* Special case - WINDOW_AGGINVERSE is always a no-op if the frame ** starts with UNBOUNDED PRECEDING. */ if( op==WINDOW_AGGINVERSE && pMWin->eStart==TK_UNBOUNDED ){ assert( regCountdown==0 && jumpOnEof==0 ); return 0; } if( regCountdown>0 ){ addrIf = sqlite3VdbeAddOp3(v, OP_IfPos, regCountdown, 0, 1); } switch( op ){ case WINDOW_RETURN_ROW: windowAggFinal(p->pParse, pMWin, 0); windowReturnOneRow(p->pParse, pMWin, p->regGosub, p->addrGosub); break; case WINDOW_AGGINVERSE: windowAggStep(p->pParse, pMWin, csr, 1, p->regArg, pMWin->regSize); break; case WINDOW_AGGSTEP: windowAggStep(p->pParse, pMWin, csr, 0, p->regArg, pMWin->regSize); break; } if( jumpOnEof ){ sqlite3VdbeAddOp2(v, OP_Next, csr, sqlite3VdbeCurrentAddr(v)+2); ret = sqlite3VdbeAddOp0(v, OP_Goto); }else{ sqlite3VdbeAddOp2(v, OP_Next, csr, sqlite3VdbeCurrentAddr(v)+1); } if( regCountdown>0 ){ sqlite3VdbeJumpHere(v, addrIf); } return ret; } /* ** This function - windowCodeStep() - generates the VM code that reads data ** from the sub-select and returns rows to the consumer. For the simplest ** case: ** ** ROWS BETWEEN <expr1> PRECEDING AND <expr2> FOLLOWING ................................................................................ ** if( new partition ){ ** Gosub flush ** } ** Insert new row into eph table. ** ** if( first row of partition ){ ** Rewind(csrEnd, skipNext=1) ** Rewind(csrStart, skipNext=1) ** Rewind(csrCurrent, skipNext=1) ** ** regEnd = <expr2> // FOLLOWING expression ** regStart = <expr1> // PRECEDING expression ** }else{ ** if( (regEnd--)<=0 ){ ** Next(csrCurrent) ** Return one row. ** if( (regStart--)<0 ){ ** Next(csrStart) ** AggInverse(csrStart) ** } ** } ** } ** ** Next(csrEnd) ** AggStep(csrEnd) ** } ** flush: ** while( 1 ){ ** Next(csrCurrent) ** if( eof ) break ** Return one row. ** if( (regStart--)<0 ){ ** Next(csrStart) ** AggInverse(csrStart) ** } ** } ** Empty eph table. ** ** More generally, the pattern used for all window types is: ** ** while( !eof ){ ................................................................................ Parse *pParse, Select *p, WhereInfo *pWInfo, int regGosub, int addrGosub ){ Window *pMWin = p->pWin; Vdbe *v = sqlite3GetVdbe(pParse); int regFlushPart; /* Register for "Gosub flush_partition" */ int regArg; int csrCurrent = pMWin->iEphCsr; int csrWrite = csrCurrent+1; int csrStart = csrCurrent+2; int csrEnd = csrCurrent+3; int iSubCsr = p->pSrc->a[0].iCursor; /* Cursor of sub-select */ int nSub = p->pSrc->a[0].pTab->nCol; /* Number of cols returned by sub */ int iCol; /* To iterate through sub cols */ int addrGoto; int addrIf; ................................................................................ int addrGosubFlush; int addrInteger; int addrCacheRewind; int addrCacheNext; int addrShortcut = 0; int addrEmpty = 0; int bCache = windowCachePartition(pMWin); int regStart = 0; /* Value of <expr> PRECEDING */ int regEnd = 0; /* Value of <expr> FOLLOWING */ int reg = pParse->nMem+1; int regRecord = reg+nSub; int regRowid = regRecord+1; WindowCodeArg s; memset(&s, 0, sizeof(WindowCodeArg)); s.pParse = pParse; s.pMWin = pMWin; s.pVdbe = v; s.regGosub = regGosub; s.addrGosub = addrGosub; pParse->nMem += 1 + nSub + 1; regFlushPart = ++pParse->nMem; if( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_FOLLOWING ){ regStart = ++pParse->nMem; } if( pMWin->eEnd==TK_PRECEDING || pMWin->eEnd==TK_FOLLOWING ){ regEnd = ++pParse->nMem; } assert( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_CURRENT || pMWin->eStart==TK_FOLLOWING || pMWin->eStart==TK_UNBOUNDED ); assert( pMWin->eEnd==TK_FOLLOWING ................................................................................ if( pMWin->eStart==pMWin->eEnd && regStart && regEnd ){ int op = ((pMWin->eStart==TK_FOLLOWING) ? OP_Ge : OP_Le); int addrGe = sqlite3VdbeAddOp3(v, op, regStart, 0, regEnd); windowAggFinal(pParse, pMWin, 0); if( bCache ){ sqlite3VdbeAddOp2(v, OP_Rowid, csrWrite, regRowid); sqlite3VdbeAddOp3(v, OP_NotExists, csrCurrent, 0, regRowid); windowReturnOneRow(pParse, pMWin, regGosub, addrGosub); sqlite3VdbeAddOp2(v, OP_Next, csrWrite, addrCacheRewind+1); }else{ sqlite3VdbeAddOp2(v, OP_Rewind, csrCurrent, 1); windowReturnOneRow(pParse, pMWin, regGosub, addrGosub); sqlite3VdbeAddOp1(v, OP_ResetSorter, csrCurrent); } addrShortcut = sqlite3VdbeAddOp0(v, OP_Goto); sqlite3VdbeJumpHere(v, addrGe); } if( pMWin->eStart==TK_FOLLOWING && regEnd ){ assert( pMWin->eEnd==TK_FOLLOWING ); sqlite3VdbeAddOp3(v, OP_Subtract, regStart, regEnd, regStart); } if( pMWin->eStart!=TK_UNBOUNDED ){ sqlite3VdbeAddOp2(v, OP_Rewind, csrStart, 1); } sqlite3VdbeAddOp2(v, OP_Rewind, csrCurrent, 1); sqlite3VdbeAddOp2(v, OP_Rewind, csrEnd, 1); sqlite3VdbeAddOp2(v, OP_Integer, 0, pMWin->regFirst); addrGoto = sqlite3VdbeAddOp0(v, OP_Goto); /* Begin generating SECOND_ROW_CODE */ VdbeModuleComment((pParse->pVdbe, "Begin windowCodeStep.SECOND_ROW_CODE")); if( bCache ){ addrCacheNext = sqlite3VdbeCurrentAddr(v); }else{ sqlite3VdbeJumpHere(v, addrIf); } if( pMWin->eStart==TK_FOLLOWING ){ windowCodeOp(&s, WINDOW_AGGSTEP, csrEnd, 0, 0); if( pMWin->eEnd!=TK_UNBOUNDED ){ windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, regEnd, 0); windowCodeOp(&s, WINDOW_AGGINVERSE, csrStart, regStart, 0); } }else if( pMWin->eEnd==TK_PRECEDING ){ windowCodeOp(&s, WINDOW_AGGSTEP, csrEnd, regEnd, 0); windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, 0, 0); windowCodeOp(&s, WINDOW_AGGINVERSE, csrStart, regStart, 0); }else{ int addr; windowCodeOp(&s, WINDOW_AGGSTEP, csrEnd, 0, 0); if( pMWin->eEnd!=TK_UNBOUNDED ){ if( regEnd ) addr = sqlite3VdbeAddOp3(v, OP_IfPos, regEnd, 0, 1); windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, 0, 0); windowCodeOp(&s, WINDOW_AGGINVERSE, csrStart, regStart, 0); if( regEnd ) sqlite3VdbeJumpHere(v, addr); } } VdbeModuleComment((pParse->pVdbe, "End windowCodeStep.SECOND_ROW_CODE")); /* End of the main input loop */ sqlite3VdbeJumpHere(v, addrGoto); if( bCache ){ sqlite3VdbeAddOp2(v, OP_Next, csrWrite, addrCacheNext); sqlite3VdbeJumpHere(v, addrCacheRewind); ................................................................................ addrInteger = sqlite3VdbeAddOp2(v, OP_Integer, 0, regFlushPart); sqlite3VdbeJumpHere(v, addrGosubFlush); } VdbeModuleComment((pParse->pVdbe, "Begin windowCodeStep.FLUSH_CODE")); addrEmpty = sqlite3VdbeAddOp1(v, OP_Rewind, csrWrite); if( pMWin->eEnd==TK_PRECEDING ){ windowCodeOp(&s, WINDOW_AGGSTEP, csrEnd, regEnd, 0); windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, 0, 0); }else if( pMWin->eStart==TK_FOLLOWING ){ int addrStart; int addrBreak1; int addrBreak2; int addrBreak3; windowCodeOp(&s, WINDOW_AGGSTEP, csrEnd, 0, 0); if( pMWin->eEnd==TK_UNBOUNDED ){ addrStart = sqlite3VdbeCurrentAddr(v); addrBreak1 = windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, regStart, 1); addrBreak2 = windowCodeOp(&s, WINDOW_AGGINVERSE, csrStart, 0, 1); }else{ assert( pMWin->eEnd==TK_FOLLOWING ); addrStart = sqlite3VdbeCurrentAddr(v); addrBreak1 = windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, regEnd, 1); addrBreak2 = windowCodeOp(&s, WINDOW_AGGINVERSE, csrStart, regStart, 1); } sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart); sqlite3VdbeJumpHere(v, addrBreak2); addrStart = sqlite3VdbeCurrentAddr(v); addrBreak3 = windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, 0, 1); sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart); sqlite3VdbeJumpHere(v, addrBreak1); sqlite3VdbeJumpHere(v, addrBreak3); }else{ int addrBreak; int addrStart; windowCodeOp(&s, WINDOW_AGGSTEP, csrEnd, 0, 0); addrStart = sqlite3VdbeCurrentAddr(v); addrBreak = windowCodeOp(&s, WINDOW_RETURN_ROW, csrCurrent, 0, 1); windowCodeOp(&s, WINDOW_AGGINVERSE, csrStart, regStart, 0); sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart); sqlite3VdbeJumpHere(v, addrBreak); } sqlite3VdbeJumpHere(v, addrEmpty); if( bCache && addrShortcut>0 ) sqlite3VdbeJumpHere(v, addrShortcut); sqlite3VdbeAddOp1(v, OP_ResetSorter, csrCurrent); sqlite3VdbeAddOp2(v, OP_Integer, 0, pMWin->regSize); if( bCache==0 ) sqlite3VdbeAddOp2(v, OP_Integer, 1, pMWin->regFirst); VdbeModuleComment((pParse->pVdbe, "End windowCodeStep.FLUSH_CODE")); if( pMWin->pPartition ){ sqlite3VdbeChangeP1(v, addrInteger, sqlite3VdbeCurrentAddr(v)); sqlite3VdbeAddOp1(v, OP_Return, regFlushPart); } } /* ** This function does the work of sqlite3WindowCodeStep() for cases that ** would normally be handled by windowCodeDefaultStep() when there are ** one or more built-in window-functions that require the entire partition ** to be cached in a temp table before any rows can be returned. Additionally. ** "RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING" is always handled by ** this function. ** ** Pseudo-code corresponding to the VM code generated by this function ** for each type of window follows. ** ** RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ** ** flush_partition: ** Once { ** OpenDup (iEphCsr -> csrLead) ** } ** Integer ctr 0 ** foreach row (csrLead){ ** if( new peer ){ ** AggFinal (xValue) ** for(i=0; i<ctr; i++){ ** Gosub addrGosub ** Next iEphCsr ** } ** Integer ctr 0 ** } ** AggStep (csrLead) ** Incr ctr ** } ** ** AggFinal (xFinalize) ** for(i=0; i<ctr; i++){ ** Gosub addrGosub ** Next iEphCsr ** } ** ** ResetSorter (csr) ** Return ** ** ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ** ** As above, except that the "if( new peer )" branch is always taken. ** ** RANGE BETWEEN CURRENT ROW AND CURRENT ROW ** ** As above, except that each of the for() loops becomes: ** ** for(i=0; i<ctr; i++){ ** Gosub addrGosub ** AggInverse (iEphCsr) ** Next iEphCsr ** } ** ** RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING ** ** flush_partition: ** Once { ** OpenDup (iEphCsr -> csrLead) ** } ** foreach row (csrLead) { ** AggStep (csrLead) ** } ** foreach row (iEphCsr) { ** Gosub addrGosub ** } ** ** RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING ** ** flush_partition: ** Once { ** OpenDup (iEphCsr -> csrLead) ** } ** foreach row (csrLead){ ** AggStep (csrLead) ** } ** Rewind (csrLead) ** Integer ctr 0 ** foreach row (csrLead){ ** if( new peer ){ ** AggFinal (xValue) ** for(i=0; i<ctr; i++){ ** Gosub addrGosub ** AggInverse (iEphCsr) ** Next iEphCsr ** } ** Integer ctr 0 ** } ** Incr ctr ** } ** ** AggFinal (xFinalize) ** for(i=0; i<ctr; i++){ ** Gosub addrGosub ** Next iEphCsr ** } ** ** ResetSorter (csr) ** Return */ static void windowCodeCacheStep( Parse *pParse, Select *p, WhereInfo *pWInfo, int regGosub, int addrGosub ){ Window *pMWin = p->pWin; Vdbe *v = sqlite3GetVdbe(pParse); int k; int addr; ExprList *pPart = pMWin->pPartition; ExprList *pOrderBy = pMWin->pOrderBy; int nPeer = pOrderBy ? pOrderBy->nExpr : 0; int regNewPeer; int addrGoto; /* Address of Goto used to jump flush_par.. */ int addrNext; /* Jump here for next iteration of loop */ int regFlushPart; int lblFlushPart; int csrLead; int regCtr; int regArg; /* Register array to martial function args */ int regSize; int lblEmpty; int bReverse = pMWin->pOrderBy && pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_UNBOUNDED; assert( (pMWin->eStart==TK_UNBOUNDED && pMWin->eEnd==TK_CURRENT) || (pMWin->eStart==TK_UNBOUNDED && pMWin->eEnd==TK_UNBOUNDED) || (pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_CURRENT) || (pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_UNBOUNDED) ); lblEmpty = sqlite3VdbeMakeLabel(pParse); regNewPeer = pParse->nMem+1; pParse->nMem += nPeer; /* Allocate register and label for the "flush_partition" sub-routine. */ regFlushPart = ++pParse->nMem; lblFlushPart = sqlite3VdbeMakeLabel(pParse); csrLead = pParse->nTab++; regCtr = ++pParse->nMem; windowPartitionCache(pParse, p, pWInfo, regFlushPart, lblFlushPart, ®Size); addrGoto = sqlite3VdbeAddOp0(v, OP_Goto); /* Start of "flush_partition" */ sqlite3VdbeResolveLabel(v, lblFlushPart); sqlite3VdbeAddOp2(v, OP_Once, 0, sqlite3VdbeCurrentAddr(v)+2); VdbeCoverage(v); sqlite3VdbeAddOp2(v, OP_OpenDup, csrLead, pMWin->iEphCsr); /* Initialize the accumulator register for each window function to NULL */ regArg = windowInitAccum(pParse, pMWin); sqlite3VdbeAddOp2(v, OP_Integer, 0, regCtr); sqlite3VdbeAddOp2(v, OP_Rewind, csrLead, lblEmpty); VdbeCoverage(v); sqlite3VdbeAddOp2(v, OP_Rewind, pMWin->iEphCsr, lblEmpty); VdbeCoverageNeverTaken(v); if( bReverse ){ int addr2 = sqlite3VdbeCurrentAddr(v); windowAggStep(pParse, pMWin, csrLead, 0, regArg, regSize); sqlite3VdbeAddOp2(v, OP_Next, csrLead, addr2); VdbeCoverage(v); sqlite3VdbeAddOp2(v, OP_Rewind, csrLead, lblEmpty); VdbeCoverageNeverTaken(v); } addrNext = sqlite3VdbeCurrentAddr(v); if( pOrderBy && (pMWin->eEnd==TK_CURRENT || pMWin->eStart==TK_CURRENT) ){ int bCurrent = (pMWin->eStart==TK_CURRENT); int addrJump = 0; /* Address of OP_Jump below */ if( pMWin->eType==TK_RANGE ){ int iOff = pMWin->nBufferCol + (pPart ? pPart->nExpr : 0); int regPeer = pMWin->regPart + (pPart ? pPart->nExpr : 0); KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pOrderBy, 0, 0); for(k=0; k<nPeer; k++){ sqlite3VdbeAddOp3(v, OP_Column, csrLead, iOff+k, regNewPeer+k); } addr = sqlite3VdbeAddOp3(v, OP_Compare, regNewPeer, regPeer, nPeer); sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO); addrJump = sqlite3VdbeAddOp3(v, OP_Jump, addr+2, 0, addr+2); VdbeCoverage(v); sqlite3VdbeAddOp3(v, OP_Copy, regNewPeer, regPeer, nPeer-1); } windowReturnRows(pParse, pMWin, regCtr, regGosub, addrGosub, (bCurrent ? regArg : 0), (bCurrent ? regSize : 0) ); if( addrJump ) sqlite3VdbeJumpHere(v, addrJump); } if( bReverse==0 ){ windowAggStep(pParse, pMWin, csrLead, 0, regArg, regSize); } sqlite3VdbeAddOp2(v, OP_AddImm, regCtr, 1); sqlite3VdbeAddOp2(v, OP_Next, csrLead, addrNext); VdbeCoverage(v); windowReturnRows(pParse, pMWin, regCtr, regGosub, addrGosub, 0, 0); sqlite3VdbeResolveLabel(v, lblEmpty); sqlite3VdbeAddOp1(v, OP_ResetSorter, pMWin->iEphCsr); sqlite3VdbeAddOp1(v, OP_Return, regFlushPart); /* Jump to here to skip over flush_partition */ sqlite3VdbeJumpHere(v, addrGoto); } /* ** RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ** ** ... ** if( new partition ){ ** AggFinal (xFinalize) ** Gosub addrGosub ** ResetSorter eph-table ** } ** else if( new peer ){ ** AggFinal (xValue) ** Gosub addrGosub ** ResetSorter eph-table ** } ** AggStep ** Insert (record into eph-table) ** sqlite3WhereEnd() ** AggFinal (xFinalize) ** Gosub addrGosub ** ** RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING ** ** As above, except take no action for a "new peer". Invoke ** the sub-routine once only for each partition. ** ** RANGE BETWEEN CURRENT ROW AND CURRENT ROW ** ** As above, except that the "new peer" condition is handled in the ** same way as "new partition" (so there is no "else if" block). ** ** ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ** ** As above, except assume every row is a "new peer". */ static void windowCodeDefaultStep( Parse *pParse, Select *p, WhereInfo *pWInfo, int regGosub, int addrGosub ){ Window *pMWin = p->pWin; Vdbe *v = sqlite3GetVdbe(pParse); int k; int iSubCsr = p->pSrc->a[0].iCursor; int nSub = p->pSrc->a[0].pTab->nCol; int reg = pParse->nMem+1; int regRecord = reg+nSub; int regRowid = regRecord+1; int addr; ExprList *pPart = pMWin->pPartition; ExprList *pOrderBy = pMWin->pOrderBy; assert( pMWin->eType==TK_RANGE || (pMWin->eStart==TK_UNBOUNDED && pMWin->eEnd==TK_CURRENT) ); assert( (pMWin->eStart==TK_UNBOUNDED && pMWin->eEnd==TK_CURRENT) || (pMWin->eStart==TK_UNBOUNDED && pMWin->eEnd==TK_UNBOUNDED) || (pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_CURRENT) || (pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_UNBOUNDED && !pOrderBy) ); if( pMWin->eEnd==TK_UNBOUNDED ){ pOrderBy = 0; } pParse->nMem += nSub + 2; /* Load the individual column values of the row returned by ** the sub-select into an array of registers. */ for(k=0; k<nSub; k++){ sqlite3VdbeAddOp3(v, OP_Column, iSubCsr, k, reg+k); } /* Check if this is the start of a new partition or peer group. */ if( pPart || pOrderBy ){ int nPart = (pPart ? pPart->nExpr : 0); int addrGoto = 0; int addrJump = 0; int nPeer = (pOrderBy ? pOrderBy->nExpr : 0); if( pPart ){ int regNewPart = reg + pMWin->nBufferCol; KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pPart, 0, 0); addr = sqlite3VdbeAddOp3(v, OP_Compare, regNewPart, pMWin->regPart,nPart); sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO); addrJump = sqlite3VdbeAddOp3(v, OP_Jump, addr+2, 0, addr+2); VdbeCoverageEqNe(v); windowAggFinal(pParse, pMWin, 1); if( pOrderBy ){ addrGoto = sqlite3VdbeAddOp0(v, OP_Goto); } } if( pOrderBy ){ int regNewPeer = reg + pMWin->nBufferCol + nPart; int regPeer = pMWin->regPart + nPart; if( addrJump ) sqlite3VdbeJumpHere(v, addrJump); if( pMWin->eType==TK_RANGE ){ KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pOrderBy, 0, 0); addr = sqlite3VdbeAddOp3(v, OP_Compare, regNewPeer, regPeer, nPeer); sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO); addrJump = sqlite3VdbeAddOp3(v, OP_Jump, addr+2, 0, addr+2); VdbeCoverage(v); }else{ addrJump = 0; } windowAggFinal(pParse, pMWin, pMWin->eStart==TK_CURRENT); if( addrGoto ) sqlite3VdbeJumpHere(v, addrGoto); } sqlite3VdbeAddOp2(v, OP_Rewind, pMWin->iEphCsr,sqlite3VdbeCurrentAddr(v)+3); VdbeCoverage(v); sqlite3VdbeAddOp2(v, OP_Gosub, regGosub, addrGosub); sqlite3VdbeAddOp2(v, OP_Next, pMWin->iEphCsr, sqlite3VdbeCurrentAddr(v)-1); VdbeCoverage(v); sqlite3VdbeAddOp1(v, OP_ResetSorter, pMWin->iEphCsr); sqlite3VdbeAddOp3( v, OP_Copy, reg+pMWin->nBufferCol, pMWin->regPart, nPart+nPeer-1 ); if( addrJump ) sqlite3VdbeJumpHere(v, addrJump); } /* Invoke step function for window functions */ windowAggStep(pParse, pMWin, -1, 0, reg, 0); /* Buffer the current row in the ephemeral table. */ if( pMWin->nBufferCol>0 ){ sqlite3VdbeAddOp3(v, OP_MakeRecord, reg, pMWin->nBufferCol, regRecord); }else{ sqlite3VdbeAddOp2(v, OP_Blob, 0, regRecord); sqlite3VdbeAppendP4(v, (void*)"", 0); } sqlite3VdbeAddOp2(v, OP_NewRowid, pMWin->iEphCsr, regRowid); sqlite3VdbeAddOp3(v, OP_Insert, pMWin->iEphCsr, regRecord, regRowid); /* End the database scan loop. */ sqlite3WhereEnd(pWInfo); windowAggFinal(pParse, pMWin, 1); sqlite3VdbeAddOp2(v, OP_Rewind, pMWin->iEphCsr,sqlite3VdbeCurrentAddr(v)+3); VdbeCoverage(v); sqlite3VdbeAddOp2(v, OP_Gosub, regGosub, addrGosub); sqlite3VdbeAddOp2(v, OP_Next, pMWin->iEphCsr, sqlite3VdbeCurrentAddr(v)-1); VdbeCoverage(v); } /* ** Allocate and return a duplicate of the Window object indicated by the ** third argument. Set the Window.pOwner field of the new object to ** pOwner. */ Window *sqlite3WindowDup(sqlite3 *db, Expr *pOwner, Window *p){ ................................................................................ void sqlite3WindowCodeStep( Parse *pParse, /* Parse context */ Select *p, /* Rewritten SELECT statement */ 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; /* There are three different functions that may be used to do the work ** of this one, depending on the window frame and the specific built-in ** window functions used (if any). ** ** windowCodeRowExprStep() handles all "ROWS" window frames, except for: ** ** ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ** ** The exception is because windowCodeRowExprStep() implements all window ** frame types by caching the entire partition in a temp table, and ** "ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW" is easy enough to ** implement without such a cache. ** ** windowCodeCacheStep() is used for: ** ** RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING ** ** It is also used for anything not handled by windowCodeRowExprStep() ** that invokes a built-in window function that requires the entire ** partition to be cached in a temp table before any rows are returned ** (e.g. nth_value() or percent_rank()). ** ** Finally, assuming there is no built-in window function that requires ** the partition to be cached, windowCodeDefaultStep() is used for: ** ** RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ** RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING ** RANGE BETWEEN CURRENT ROW AND CURRENT ROW ** ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ** ** windowCodeDefaultStep() is the only one of the three functions that ** does not cache each partition in a temp table before beginning to ** return rows. */ if( pMWin->eType==TK_ROWS ){ VdbeModuleComment((pParse->pVdbe, "Begin windowCodeStep()")); windowCodeStep(pParse, p, pWInfo, regGosub, addrGosub); VdbeModuleComment((pParse->pVdbe, "End windowCodeStep()")); }else{ Window *pWin; int bCache = 0; /* True to use CacheStep() */ if( pMWin->eStart==TK_CURRENT && pMWin->eEnd==TK_UNBOUNDED ){ bCache = 1; }else{ for(pWin=pMWin; pWin; pWin=pWin->pNextWin){ FuncDef *pFunc = pWin->pFunc; if( (pFunc->funcFlags & SQLITE_FUNC_WINDOW_SIZE) || (pFunc->zName==nth_valueName) || (pFunc->zName==first_valueName) || (pFunc->zName==leadName) || (pFunc->zName==lagName) ){ bCache = 1; break; } } } /* Otherwise, call windowCodeDefaultStep(). */ if( bCache ){ VdbeModuleComment((pParse->pVdbe, "Begin CacheStep()")); windowCodeCacheStep(pParse, p, pWInfo, regGosub, addrGosub); VdbeModuleComment((pParse->pVdbe, "End CacheStep()")); }else{ VdbeModuleComment((pParse->pVdbe, "Begin DefaultStep()")); windowCodeDefaultStep(pParse, p, pWInfo, regGosub, addrGosub); VdbeModuleComment((pParse->pVdbe, "End DefaultStep()")); } } } #endif /* SQLITE_OMIT_WINDOWFUNC */ |
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int eEnd, /* End type: CURRENT, FOLLOWING, TK_UNBOUNDED, PRECEDING */ Expr *pEnd /* End window size if TK_FOLLOWING or PRECEDING */ ){ Window *pWin = 0; int bImplicitFrame = 0; /* Parser assures the following: */ assert( eType==0 || eType==TK_RANGE || eType==TK_ROWS || eType==TK_GROUPS ); assert( eStart==TK_CURRENT || eStart==TK_PRECEDING || eStart==TK_UNBOUNDED || eStart==TK_FOLLOWING ); assert( eEnd==TK_CURRENT || eEnd==TK_FOLLOWING || eEnd==TK_UNBOUNDED || eEnd==TK_PRECEDING ); assert( (eStart==TK_PRECEDING || eStart==TK_FOLLOWING)==(pStart!=0) ); assert( (eEnd==TK_FOLLOWING || eEnd==TK_PRECEDING)==(pEnd!=0) ); ................................................................................ pWin->regResult); sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF); } } } } /* ** Invoke the sub-routine at regGosub (generated by code in select.c) to ** return the current row of Window.iEphCsr. If all window functions are ** aggregate window functions that use the standard API, a single ** OP_Gosub instruction is all that this routine generates. Extra VM code ** for per-row processing is only generated for the following built-in window ** functions: ................................................................................ sqlite3VdbeResolveLabel(v, lbl); sqlite3ReleaseTempReg(pParse, tmpReg); } } sqlite3VdbeAddOp2(v, OP_Gosub, regGosub, addrGosub); } /* ** Generate code to set the accumulator register for each window function ** in the linked list passed as the second argument to NULL. And perform ** any equivalent initialization required by any built-in window functions ** in the list. */ static int windowInitAccum(Parse *pParse, Window *pMWin){ ................................................................................ || (pFunc->zName==lagName) ){ return 1; } } return 0; } /* ** regOld and regNew are each the first register in an array of size ** pOrderBy->nExpr. This function generates code to compare the two ** arrays of registers using the collation sequences and other comparison ** parameters specified by pOrderBy. ** ** If the two arrays are not equal, the contents of regNew is copied to ** regOld and control falls through. Otherwise, if the contents of the arrays ** are equal, an OP_Goto is executed. The address of the OP_Goto is returned. */ static int windowIfNewPeer( Parse *pParse, ExprList *pOrderBy, int regNew, /* First in array of new values */ int regOld /* First in array of old values */ ){ Vdbe *v = sqlite3GetVdbe(pParse); int addr; if( pOrderBy ){ int nVal = pOrderBy->nExpr; KeyInfo *pKeyInfo = sqlite3KeyInfoFromExprList(pParse, pOrderBy, 0, 0); sqlite3VdbeAddOp3(v, OP_Compare, regOld, regNew, nVal); sqlite3VdbeAppendP4(v, (void*)pKeyInfo, P4_KEYINFO); addr = sqlite3VdbeAddOp3( v, OP_Jump, sqlite3VdbeCurrentAddr(v)+1, 0, sqlite3VdbeCurrentAddr(v)+1 ); VdbeCoverageEqNe(v); sqlite3VdbeAddOp3(v, OP_Copy, regNew, regOld, nVal-1); }else{ addr = sqlite3VdbeAddOp0(v, OP_Goto); } return addr; } typedef struct WindowCodeArg WindowCodeArg; typedef struct WindowCsrAndReg WindowCsrAndReg; struct WindowCsrAndReg { int csr; int reg; }; struct WindowCodeArg { Parse *pParse; Window *pMWin; Vdbe *pVdbe; int regGosub; int addrGosub; int regArg; WindowCsrAndReg start; WindowCsrAndReg current; WindowCsrAndReg end; }; #define WINDOW_RETURN_ROW 1 #define WINDOW_AGGINVERSE 2 #define WINDOW_AGGSTEP 3 /* ** Generate VM code to read the window frames peer values from cursor csr into ** an array of registers starting at reg. */ static void windowReadPeerValues( WindowCodeArg *p, int csr, int reg ){ Window *pMWin = p->pMWin; ExprList *pOrderBy = pMWin->pOrderBy; if( pOrderBy ){ Vdbe *v = sqlite3GetVdbe(p->pParse); ExprList *pPart = pMWin->pPartition; int iColOff = pMWin->nBufferCol + (pPart ? pPart->nExpr : 0); int i; for(i=0; i<pOrderBy->nExpr; i++){ sqlite3VdbeAddOp3(v, OP_Column, csr, iColOff+i, reg+i); } } } static int windowCodeOp( WindowCodeArg *p, int op, int regCountdown, int jumpOnEof ){ int csr, reg; Parse *pParse = p->pParse; Window *pMWin = p->pMWin; int ret = 0; Vdbe *v = p->pVdbe; int addrIf = 0; int addrContinue = 0; int addrGoto = 0; int bPeer = (pMWin->eType!=TK_ROWS); /* Special case - WINDOW_AGGINVERSE is always a no-op if the frame ** starts with UNBOUNDED PRECEDING. */ if( op==WINDOW_AGGINVERSE && pMWin->eStart==TK_UNBOUNDED ){ assert( regCountdown==0 && jumpOnEof==0 ); return 0; } if( regCountdown>0 ){ addrIf = sqlite3VdbeAddOp3(v, OP_IfPos, regCountdown, 0, 1); } if( op==WINDOW_RETURN_ROW ){ windowAggFinal(pParse, pMWin, 0); } addrContinue = sqlite3VdbeCurrentAddr(v); switch( op ){ case WINDOW_RETURN_ROW: csr = p->current.csr; reg = p->current.reg; windowReturnOneRow(pParse, pMWin, p->regGosub, p->addrGosub); break; case WINDOW_AGGINVERSE: csr = p->start.csr; reg = p->start.reg; windowAggStep(pParse, pMWin, csr, 1, p->regArg, pMWin->regSize); break; case WINDOW_AGGSTEP: csr = p->end.csr; reg = p->end.reg; windowAggStep(pParse, pMWin, csr, 0, p->regArg, pMWin->regSize); break; } if( jumpOnEof ){ sqlite3VdbeAddOp2(v, OP_Next, csr, sqlite3VdbeCurrentAddr(v)+2); ret = sqlite3VdbeAddOp0(v, OP_Goto); }else{ sqlite3VdbeAddOp2(v, OP_Next, csr, sqlite3VdbeCurrentAddr(v)+1+bPeer); if( bPeer ){ addrGoto = sqlite3VdbeAddOp0(v, OP_Goto); } } if( bPeer ){ int addr; int nReg = (pMWin->pOrderBy ? pMWin->pOrderBy->nExpr : 0); int regTmp = (nReg ? sqlite3GetTempRange(pParse, nReg) : 0); windowReadPeerValues(p, csr, regTmp); addr = windowIfNewPeer(pParse, pMWin->pOrderBy, regTmp, reg); sqlite3VdbeChangeP2(v, addr, addrContinue); sqlite3ReleaseTempRange(pParse, regTmp, nReg); } if( addrGoto ) sqlite3VdbeJumpHere(v, addrGoto); if( addrIf ) sqlite3VdbeJumpHere(v, addrIf); return ret; } /* ** This function - windowCodeStep() - generates the VM code that reads data ** from the sub-select and returns rows to the consumer. For the simplest ** case: ** ** ROWS BETWEEN <expr1> PRECEDING AND <expr2> FOLLOWING ................................................................................ ** if( new partition ){ ** Gosub flush ** } ** Insert new row into eph table. ** ** if( first row of partition ){ ** Rewind(csrEnd, skipNext=1) ** Rewind(start.csr, skipNext=1) ** Rewind(csrCurrent, skipNext=1) ** ** regEnd = <expr2> // FOLLOWING expression ** regStart = <expr1> // PRECEDING expression ** }else{ ** if( (regEnd--)<=0 ){ ** Next(csrCurrent) ** Return one row. ** if( (regStart--)<0 ){ ** Next(start.csr) ** AggInverse(start.csr) ** } ** } ** } ** ** Next(csrEnd) ** AggStep(csrEnd) ** } ** flush: ** while( 1 ){ ** Next(csrCurrent) ** if( eof ) break ** Return one row. ** if( (regStart--)<0 ){ ** Next(start.csr) ** AggInverse(start.csr) ** } ** } ** Empty eph table. ** ** More generally, the pattern used for all window types is: ** ** while( !eof ){ ................................................................................ Parse *pParse, Select *p, WhereInfo *pWInfo, int regGosub, int addrGosub ){ Window *pMWin = p->pWin; ExprList *pOrderBy = pMWin->pOrderBy; Vdbe *v = sqlite3GetVdbe(pParse); int regFlushPart; /* Register for "Gosub flush_partition" */ int regArg; int csrWrite = pMWin->iEphCsr+1; int iSubCsr = p->pSrc->a[0].iCursor; /* Cursor of sub-select */ int nSub = p->pSrc->a[0].pTab->nCol; /* Number of cols returned by sub */ int iCol; /* To iterate through sub cols */ int addrGoto; int addrIf; ................................................................................ int addrGosubFlush; int addrInteger; int addrCacheRewind; int addrCacheNext; int addrShortcut = 0; int addrEmpty = 0; int addrPeerJump = 0; int bCache = windowCachePartition(pMWin); int regStart = 0; /* Value of <expr> PRECEDING */ int regEnd = 0; /* Value of <expr> FOLLOWING */ int reg = pParse->nMem+1; int regRecord = reg+nSub; int regRowid = regRecord+1; int regPeer = 0; int regNewPeer = 0; WindowCodeArg s; memset(&s, 0, sizeof(WindowCodeArg)); s.pParse = pParse; s.pMWin = pMWin; s.pVdbe = v; s.regGosub = regGosub; s.addrGosub = addrGosub; s.current.csr = pMWin->iEphCsr; s.start.csr = s.current.csr+2; s.end.csr = s.current.csr+3; pParse->nMem += 1 + nSub + 1; regFlushPart = ++pParse->nMem; if( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_FOLLOWING ){ regStart = ++pParse->nMem; } if( pMWin->eEnd==TK_PRECEDING || pMWin->eEnd==TK_FOLLOWING ){ regEnd = ++pParse->nMem; } /* If this is not a "ROWS BETWEEN ..." frame, then allocate registers to ** store a copy of the current ORDER BY expressions. */ if( pMWin->eType!=TK_ROWS ){ int nPeer = (pOrderBy ? pOrderBy->nExpr : 0); regNewPeer = reg + pMWin->nBufferCol; if( pMWin->pPartition ) regNewPeer += pMWin->pPartition->nExpr; regPeer = pParse->nMem+1; pParse->nMem += nPeer; s.start.reg = pParse->nMem+1; pParse->nMem += nPeer; s.current.reg = pParse->nMem+1; pParse->nMem += nPeer; s.end.reg = pParse->nMem+1; pParse->nMem += nPeer; } assert( pMWin->eStart==TK_PRECEDING || pMWin->eStart==TK_CURRENT || pMWin->eStart==TK_FOLLOWING || pMWin->eStart==TK_UNBOUNDED ); assert( pMWin->eEnd==TK_FOLLOWING ................................................................................ if( pMWin->eStart==pMWin->eEnd && regStart && regEnd ){ int op = ((pMWin->eStart==TK_FOLLOWING) ? OP_Ge : OP_Le); int addrGe = sqlite3VdbeAddOp3(v, op, regStart, 0, regEnd); windowAggFinal(pParse, pMWin, 0); if( bCache ){ sqlite3VdbeAddOp2(v, OP_Rowid, csrWrite, regRowid); sqlite3VdbeAddOp3(v, OP_NotExists, s.current.csr, 0, regRowid); windowReturnOneRow(pParse, pMWin, regGosub, addrGosub); sqlite3VdbeAddOp2(v, OP_Next, csrWrite, addrCacheRewind+1); }else{ sqlite3VdbeAddOp2(v, OP_Rewind, s.current.csr, 1); windowReturnOneRow(pParse, pMWin, regGosub, addrGosub); sqlite3VdbeAddOp1(v, OP_ResetSorter, s.current.csr); } addrShortcut = sqlite3VdbeAddOp0(v, OP_Goto); sqlite3VdbeJumpHere(v, addrGe); } if( pMWin->eStart==TK_FOLLOWING && regEnd ){ assert( pMWin->eEnd==TK_FOLLOWING ); sqlite3VdbeAddOp3(v, OP_Subtract, regStart, regEnd, regStart); } if( pMWin->eStart!=TK_UNBOUNDED ){ sqlite3VdbeAddOp2(v, OP_Rewind, s.start.csr, 1); } sqlite3VdbeAddOp2(v, OP_Rewind, s.current.csr, 1); sqlite3VdbeAddOp2(v, OP_Rewind, s.end.csr, 1); if( regPeer && pOrderBy ){ if( bCache ){ windowReadPeerValues(&s, csrWrite, regPeer); }else{ sqlite3VdbeAddOp3(v, OP_Copy, regNewPeer, regPeer, pOrderBy->nExpr-1); } sqlite3VdbeAddOp3(v, OP_Copy, regPeer, s.start.reg, pOrderBy->nExpr-1); sqlite3VdbeAddOp3(v, OP_Copy, regPeer, s.current.reg, pOrderBy->nExpr-1); sqlite3VdbeAddOp3(v, OP_Copy, regPeer, s.end.reg, pOrderBy->nExpr-1); } sqlite3VdbeAddOp2(v, OP_Integer, 0, pMWin->regFirst); addrGoto = sqlite3VdbeAddOp0(v, OP_Goto); /* Begin generating SECOND_ROW_CODE */ VdbeModuleComment((pParse->pVdbe, "Begin windowCodeStep.SECOND_ROW_CODE")); if( bCache ){ addrCacheNext = sqlite3VdbeCurrentAddr(v); if( pMWin->eType!=TK_ROWS ){ windowReadPeerValues(&s, csrWrite, regNewPeer); } }else{ sqlite3VdbeJumpHere(v, addrIf); } if( regPeer ){ addrPeerJump = windowIfNewPeer(pParse, pOrderBy, regNewPeer, regPeer); } if( pMWin->eStart==TK_FOLLOWING ){ windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0); if( pMWin->eEnd!=TK_UNBOUNDED ){ windowCodeOp(&s, WINDOW_RETURN_ROW, regEnd, 0); windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0); } }else if( pMWin->eEnd==TK_PRECEDING ){ windowCodeOp(&s, WINDOW_AGGSTEP, regEnd, 0); windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0); windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0); }else{ int addr; windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0); if( pMWin->eEnd!=TK_UNBOUNDED ){ if( regEnd ) addr = sqlite3VdbeAddOp3(v, OP_IfPos, regEnd, 0, 1); windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0); windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0); if( regEnd ) sqlite3VdbeJumpHere(v, addr); } } if( addrPeerJump ){ sqlite3VdbeJumpHere(v, addrPeerJump); } VdbeModuleComment((pParse->pVdbe, "End windowCodeStep.SECOND_ROW_CODE")); /* End of the main input loop */ sqlite3VdbeJumpHere(v, addrGoto); if( bCache ){ sqlite3VdbeAddOp2(v, OP_Next, csrWrite, addrCacheNext); sqlite3VdbeJumpHere(v, addrCacheRewind); ................................................................................ addrInteger = sqlite3VdbeAddOp2(v, OP_Integer, 0, regFlushPart); sqlite3VdbeJumpHere(v, addrGosubFlush); } VdbeModuleComment((pParse->pVdbe, "Begin windowCodeStep.FLUSH_CODE")); addrEmpty = sqlite3VdbeAddOp1(v, OP_Rewind, csrWrite); if( pMWin->eEnd==TK_PRECEDING ){ windowCodeOp(&s, WINDOW_AGGSTEP, regEnd, 0); windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 0); }else if( pMWin->eStart==TK_FOLLOWING ){ int addrStart; int addrBreak1; int addrBreak2; int addrBreak3; windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0); if( pMWin->eEnd==TK_UNBOUNDED ){ addrStart = sqlite3VdbeCurrentAddr(v); addrBreak1 = windowCodeOp(&s, WINDOW_RETURN_ROW, regStart, 1); addrBreak2 = windowCodeOp(&s, WINDOW_AGGINVERSE, 0, 1); }else{ assert( pMWin->eEnd==TK_FOLLOWING ); addrStart = sqlite3VdbeCurrentAddr(v); addrBreak1 = windowCodeOp(&s, WINDOW_RETURN_ROW, regEnd, 1); addrBreak2 = windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 1); } sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart); sqlite3VdbeJumpHere(v, addrBreak2); addrStart = sqlite3VdbeCurrentAddr(v); addrBreak3 = windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 1); sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart); sqlite3VdbeJumpHere(v, addrBreak1); sqlite3VdbeJumpHere(v, addrBreak3); }else{ int addrBreak; int addrStart; windowCodeOp(&s, WINDOW_AGGSTEP, 0, 0); addrStart = sqlite3VdbeCurrentAddr(v); addrBreak = windowCodeOp(&s, WINDOW_RETURN_ROW, 0, 1); windowCodeOp(&s, WINDOW_AGGINVERSE, regStart, 0); sqlite3VdbeAddOp2(v, OP_Goto, 0, addrStart); sqlite3VdbeJumpHere(v, addrBreak); } sqlite3VdbeJumpHere(v, addrEmpty); if( bCache && addrShortcut>0 ) sqlite3VdbeJumpHere(v, addrShortcut); sqlite3VdbeAddOp1(v, OP_ResetSorter, s.current.csr); sqlite3VdbeAddOp2(v, OP_Integer, 0, pMWin->regSize); if( bCache==0 ) sqlite3VdbeAddOp2(v, OP_Integer, 1, pMWin->regFirst); VdbeModuleComment((pParse->pVdbe, "End windowCodeStep.FLUSH_CODE")); if( pMWin->pPartition ){ sqlite3VdbeChangeP1(v, addrInteger, sqlite3VdbeCurrentAddr(v)); sqlite3VdbeAddOp1(v, OP_Return, regFlushPart); } } /* ** Allocate and return a duplicate of the Window object indicated by the ** third argument. Set the Window.pOwner field of the new object to ** pOwner. */ Window *sqlite3WindowDup(sqlite3 *db, Expr *pOwner, Window *p){ ................................................................................ void sqlite3WindowCodeStep( Parse *pParse, /* Parse context */ Select *p, /* Rewritten SELECT statement */ WhereInfo *pWInfo, /* Context returned by sqlite3WhereBegin() */ int regGosub, /* Register for OP_Gosub */ int addrGosub /* OP_Gosub here to return each row */ ){ VdbeModuleComment((pParse->pVdbe, "Begin windowCodeStep()")); windowCodeStep(pParse, p, pWInfo, regGosub, addrGosub); VdbeModuleComment((pParse->pVdbe, "End windowCodeStep()")); } #endif /* SQLITE_OMIT_WINDOWFUNC */ |
Changes to test/pg_common.tcl.
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puts $::fd [subst -nocommands { do_test $tn { set myres {} foreach r [db eval {$sql}] { lappend myres [format $F [set r]] } set res2 {$res2} foreach r [set myres] r2 [set res2] { if {[set r]<([set r2]-$T) || [set r]>([set r2]+$T)} { error "list element [set i] does not match: got=[set r] expected=[set r2]" } } set {} {} } {} }] } proc start_test {name date} { |
> > |
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puts $::fd [subst -nocommands { do_test $tn { set myres {} foreach r [db eval {$sql}] { lappend myres [format $F [set r]] } set res2 {$res2} set i 0 foreach r [set myres] r2 [set res2] { if {[set r]<([set r2]-$T) || [set r]>([set r2]+$T)} { error "list element [set i] does not match: got=[set r] expected=[set r2]" } incr i } set {} {} } {} }] } proc start_test {name date} { |
Changes to test/window3.test.
cannot compute difference between binary files
Changes to test/window4.test.
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do_test 9.3 {
set myres {}
foreach r [db eval {SELECT x, percent_rank() OVER (PARTITION BY x ORDER BY x) FROM t2}] {
lappend myres [format %.4f [set r]]
}
set res2 {1.0000 0.0000 1.0000 0.0000 1.0000 0.0000 4.0000 0.0000 4.0000 0.0000 6.0000 0.0000 7.0000 0.0000}
foreach r [set myres] r2 [set res2] {
if {[set r]<([set r2]-0.0001) || [set r]>([set r2]+0.0001)} {
error "list element [set i] does not match: got=[set r] expected=[set r2]"
}
}
set {} {}
} {}
do_execsql_test 9.4 {
SELECT x, rank() OVER (ORDER BY x) FROM t2 ORDER BY 1,2
} {1 1 1 1 1 1 4 4 4 4 6 6 7 7}
................................................................................
do_test 9.6 {
set myres {}
foreach r [db eval {SELECT percent_rank() OVER () FROM t1}] {
lappend myres [format %.4f [set r]]
}
set res2 {0.0000 0.0000 0.0000}
foreach r [set myres] r2 [set res2] {
if {[set r]<([set r2]-0.0001) || [set r]>([set r2]+0.0001)} {
error "list element [set i] does not match: got=[set r] expected=[set r2]"
}
}
set {} {}
} {}
do_test 9.7 {
set myres {}
foreach r [db eval {SELECT cume_dist() OVER () FROM t1}] {
lappend myres [format %.4f [set r]]
}
set res2 {1.0000 1.0000 1.0000}
foreach r [set myres] r2 [set res2] {
if {[set r]<([set r2]-0.0001) || [set r]>([set r2]+0.0001)} {
error "list element [set i] does not match: got=[set r] expected=[set r2]"
}
}
set {} {}
} {}
do_execsql_test 10.0 {
DROP TABLE IF EXISTS t7;
CREATE TABLE t7(id INTEGER PRIMARY KEY, a INTEGER, b INTEGER);
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do_test 9.3 { set myres {} foreach r [db eval {SELECT x, percent_rank() OVER (PARTITION BY x ORDER BY x) FROM t2}] { lappend myres [format %.4f [set r]] } set res2 {1.0000 0.0000 1.0000 0.0000 1.0000 0.0000 4.0000 0.0000 4.0000 0.0000 6.0000 0.0000 7.0000 0.0000} set i 0 foreach r [set myres] r2 [set res2] { if {[set r]<([set r2]-0.0001) || [set r]>([set r2]+0.0001)} { error "list element [set i] does not match: got=[set r] expected=[set r2]" } incr i } set {} {} } {} do_execsql_test 9.4 { SELECT x, rank() OVER (ORDER BY x) FROM t2 ORDER BY 1,2 } {1 1 1 1 1 1 4 4 4 4 6 6 7 7} ................................................................................ do_test 9.6 { set myres {} foreach r [db eval {SELECT percent_rank() OVER () FROM t1}] { lappend myres [format %.4f [set r]] } set res2 {0.0000 0.0000 0.0000} set i 0 foreach r [set myres] r2 [set res2] { if {[set r]<([set r2]-0.0001) || [set r]>([set r2]+0.0001)} { error "list element [set i] does not match: got=[set r] expected=[set r2]" } incr i } set {} {} } {} do_test 9.7 { set myres {} foreach r [db eval {SELECT cume_dist() OVER () FROM t1}] { lappend myres [format %.4f [set r]] } set res2 {1.0000 1.0000 1.0000} set i 0 foreach r [set myres] r2 [set res2] { if {[set r]<([set r2]-0.0001) || [set r]>([set r2]+0.0001)} { error "list element [set i] does not match: got=[set r] expected=[set r2]" } incr i } set {} {} } {} do_execsql_test 10.0 { DROP TABLE IF EXISTS t7; CREATE TABLE t7(id INTEGER PRIMARY KEY, a INTEGER, b INTEGER); |
Changes to tool/mkkeywordhash.c.
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{ "FOLLOWING", "TK_FOLLOWING", WINDOWFUNC }, { "FOR", "TK_FOR", TRIGGER }, { "FOREIGN", "TK_FOREIGN", FKEY }, { "FROM", "TK_FROM", ALWAYS }, { "FULL", "TK_JOIN_KW", ALWAYS }, { "GLOB", "TK_LIKE_KW", ALWAYS }, { "GROUP", "TK_GROUP", ALWAYS }, { "HAVING", "TK_HAVING", ALWAYS }, { "IF", "TK_IF", ALWAYS }, { "IGNORE", "TK_IGNORE", CONFLICT|TRIGGER }, { "IMMEDIATE", "TK_IMMEDIATE", ALWAYS }, { "IN", "TK_IN", ALWAYS }, { "INDEX", "TK_INDEX", ALWAYS }, { "INDEXED", "TK_INDEXED", ALWAYS }, |
> |
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{ "FOLLOWING", "TK_FOLLOWING", WINDOWFUNC },
{ "FOR", "TK_FOR", TRIGGER },
{ "FOREIGN", "TK_FOREIGN", FKEY },
{ "FROM", "TK_FROM", ALWAYS },
{ "FULL", "TK_JOIN_KW", ALWAYS },
{ "GLOB", "TK_LIKE_KW", ALWAYS },
{ "GROUP", "TK_GROUP", ALWAYS },
{ "GROUPS", "TK_GROUPS", WINDOWFUNC },
{ "HAVING", "TK_HAVING", ALWAYS },
{ "IF", "TK_IF", ALWAYS },
{ "IGNORE", "TK_IGNORE", CONFLICT|TRIGGER },
{ "IMMEDIATE", "TK_IMMEDIATE", ALWAYS },
{ "IN", "TK_IN", ALWAYS },
{ "INDEX", "TK_INDEX", ALWAYS },
{ "INDEXED", "TK_INDEXED", ALWAYS },
|