/ Check-in [7b709a98]
Login
Home Timeline Branches Tags Tickets Wiki More...

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Allow "<expr> PRECEDING" to be used to specify the end of a window frame.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | exp-window-functions
Files: files | file ages | folders
SHA3-256: 7b709a989c188dbcf429989a0785294b36c8a7e89b5de8cefc25decf1f5b7f5a
User & Date: dan 2018-05-24 21:10:57
Context
2018-05-25
09:29
Fixes for "ROWS BETWEEN <expr> FOLLOWING AND <expr> FOLLOWING" and "ROWS BETWEEN <expr> FOLLOWING AND UNBOUNDED FOLLOWING" (check-in: 5ac44872 user: dan tags: exp-window-functions)
2018-05-24
21:10
Allow "<expr> PRECEDING" to be used to specify the end of a window frame. (check-in: 7b709a98 user: dan tags: exp-window-functions)
17:49
Support other frame types that use "<expr> PRECEDING" or "<expr> FOLLOWING" as start or end conditions. (check-in: ec7b648c user: dan tags: exp-window-functions)
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/window.c. 

88
89
90
91
92
93
94




















95
96
97
98
99
100
101
102
103
104
105
106
107
108
109


110
111
112

113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
































138
139
140
141
142
143
144
...
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

167
168
169
170
171
172
173
174
175
176

177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
...
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241

242
243
244

245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
...
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
...
548
549
550
551
552
553
554

555
556
557
558
559
560
561
562
563
564
565
566
567
568


  sqlite3VdbeAddOp2(v, OP_Integer, 0, regZero);
  sqlite3VdbeAddOp2(v, OP_MustBeInt, reg, sqlite3VdbeCurrentAddr(v)+2);
  sqlite3VdbeAddOp3(v, OP_Ge, regZero, sqlite3VdbeCurrentAddr(v)+2, reg);
  sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_ERROR, OE_Abort);
  sqlite3VdbeAppendP4(v, (void*)azErr[bEnd], P4_STATIC);
}





















/*
** ROWS BETWEEN <expr> PRECEDING    AND <expr> FOLLOWING
**
**   ...
**     if( new partition ){
**       Gosub flush_partition
**     }
**     Insert (record in eph-table)
**   sqlite3WhereEnd()
**   Gosub flush_partition
**
** flush_partition:
**   OpenDup (csr -> csr2)
**   OpenDup (csr -> csr3)


**   regPrec = <expr1>            // PRECEDING expression
**   regFollow = <expr2>          // FOLLOWING expression
**   if( regPrec<0 || regFollow<0 ) throw exception!

**   Rewind (csr,csr2,csr3)       // if EOF goto flush_partition_done
**     Aggstep (csr3)
**     Next(csr3)                 // if EOF fall-through
**     if( (regFollow--)<=0 ){
**       AggFinal (xValue)
**       Gosub addrGosub
**       Next(csr)                // if EOF goto flush_partition_done
**       if( (regPrec--)<=0 ){
**         AggStep (csr2, xInverse)
**         Next(csr2)
**       }
**     }
** flush_partition_done:
**   Close (csr2)
**   Close (csr3)
**   ResetSorter (csr)
**   Return
**
** ROWS BETWEEN <expr> PRECEDING    AND CURRENT ROW
** ROWS BETWEEN CURRENT ROW         AND <expr> FOLLOWING
** ROWS BETWEEN <expr> PRECEDING    AND UNBOUNDED FOLLOWING
** ROWS BETWEEN UNBOUNDED PRECEDING AND <expr> FOLLOWING
**
**   These are similar to the above. For "CURRENT ROW", intialize the
**   register to 0. For "UNBOUNDED ..." to infinity.
































**
*/
static void windowCodeRowExprStep(
  Parse *pParse, 
  Select *p,
  WhereInfo *pWInfo,
  int regGosub, 
................................................................................
  Window *pMWin = p->pWin;
  Vdbe *v = sqlite3GetVdbe(pParse);
  Window *pWin;
  int k;
  int iSubCsr = p->pSrc->a[0].iCursor;
  int nSub = p->pSrc->a[0].pTab->nCol;
  int regFlushPart;               /* Register for "Gosub flush_partition" */
  int addrFlushPart;              /* Label for "Gosub flush_partition" */
  int addrDone;                   /* Label for "Gosub flush_partition_done" */

  int reg = pParse->nMem+1;
  int regRecord = reg+nSub;
  int regRowid = regRecord+1;
  int addr;
  int csrPrec = pParse->nTab++;
  int csrFollow = pParse->nTab++;
  int regPrec;                    /* Value of <expr> PRECEDING */
  int regFollow;                  /* Value of <expr> FOLLOWING */
  int addrNext;
  int addrGoto;

  int addrIfPos1;
  int addrIfPos2;

  assert( pMWin->eStart==TK_PRECEDING 
       || pMWin->eStart==TK_CURRENT 
       || pMWin->eStart==TK_UNBOUNDED 
  );
  assert( pMWin->eEnd==TK_FOLLOWING 
       || pMWin->eEnd==TK_CURRENT 
       || pMWin->eEnd==TK_UNBOUNDED 

  );

  pParse->nMem += nSub + 2;

  /* Allocate register and label for the "flush_partition" sub-routine. */
  regFlushPart = ++pParse->nMem;
  addrFlushPart = sqlite3VdbeMakeLabel(v);
  addrDone = sqlite3VdbeMakeLabel(v);

  regPrec = ++pParse->nMem;
  regFollow = ++pParse->nMem;

  /* Martial 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);
  }
  sqlite3VdbeAddOp3(v, OP_MakeRecord, reg, nSub, regRecord);
................................................................................
    int addrJump = 0;
    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, addr+4, addr+2);
    sqlite3VdbeAddOp2(v, OP_Gosub, regFlushPart, addrFlushPart);
    sqlite3VdbeAddOp3(v, OP_Copy, regNewPart, pMWin->regPart, nPart);
  }

  /* 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, addrFlushPart);
  addrGoto = sqlite3VdbeAddOp0(v, OP_Goto);

  /* flush_partition: */
  sqlite3VdbeResolveLabel(v, addrFlushPart);
  sqlite3VdbeAddOp2(v, OP_Once, 0, sqlite3VdbeCurrentAddr(v)+3);
  sqlite3VdbeAddOp2(v, OP_OpenDup, csrPrec, pMWin->iEphCsr);
  sqlite3VdbeAddOp2(v, OP_OpenDup, csrFollow, pMWin->iEphCsr);

  /* If either regPrec or regFollow are not non-negative integers, throw 
  ** an exception.  */
  if( pMWin->pStart ){
    assert( pMWin->eStart==TK_PRECEDING );
    sqlite3ExprCode(pParse, pMWin->pStart, regPrec);
    windowCheckFrameValue(pParse, regPrec, 0);
  }
  if( pMWin->pEnd ){
    assert( pMWin->eEnd==TK_FOLLOWING );
    sqlite3ExprCode(pParse, pMWin->pEnd, regFollow);
    windowCheckFrameValue(pParse, regFollow, 1);
  }


  sqlite3VdbeAddOp2(v, OP_Null, 0, pMWin->regResult);
  sqlite3VdbeAddOp2(v, OP_Null, 0, pMWin->regAccum);


  sqlite3VdbeAddOp2(v, OP_Rewind, pMWin->iEphCsr, addrDone);
  sqlite3VdbeAddOp2(v, OP_Rewind, csrPrec, addrDone);
  sqlite3VdbeChangeP5(v, 1);
  sqlite3VdbeAddOp2(v, OP_Rewind, csrFollow, addrDone);
  sqlite3VdbeChangeP5(v, 1);

  /* Invoke AggStep function for each window function using the row that
  ** csrFollow currently points to. Or, if csrFollow is already at EOF,
  ** do nothing.  */
  addrNext = sqlite3VdbeCurrentAddr(v);
  sqlite3VdbeAddOp2(v, OP_Next, csrFollow, addrNext+2);
  sqlite3VdbeAddOp0(v, OP_Goto);
  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    int i;
    for(i=0; i<pWin->nArg; i++){
      sqlite3VdbeAddOp3(v, OP_Column, csrFollow, pWin->iArgCol+i, reg+i);
    }
    sqlite3VdbeAddOp3(v, OP_AggStep0, 0, reg, pWin->regAccum);
    sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, (u8)pWin->nArg);
  }
  if( pMWin->eEnd==TK_UNBOUNDED ){
    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrNext);
    sqlite3VdbeJumpHere(v, addrNext+1);
    addrNext = sqlite3VdbeCurrentAddr(v);
  }else{
    sqlite3VdbeJumpHere(v, addrNext+1);
  }

  if( pMWin->eEnd==TK_FOLLOWING ){
    addrIfPos1 = sqlite3VdbeAddOp3(v, OP_IfPos, regFollow, 0 , 1);
  }
  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    sqlite3VdbeAddOp3(v, 
        OP_AggFinal, pWin->regAccum, pWin->nArg, pWin->regResult
    );
    sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
  }
  sqlite3VdbeAddOp2(v, OP_Gosub, regGosub, addrGosub);
  sqlite3VdbeAddOp2(v, OP_Next, pMWin->iEphCsr, sqlite3VdbeCurrentAddr(v)+2);
  sqlite3VdbeAddOp2(v, OP_Goto, 0, addrDone);

  if( pMWin->eStart==TK_CURRENT || pMWin->eStart==TK_PRECEDING ){
    if( pMWin->eStart==TK_PRECEDING ){
      addrIfPos2 = sqlite3VdbeAddOp3(v, OP_IfPos, regPrec, 0 , 1);
    }
    sqlite3VdbeAddOp2(v, OP_Next, csrPrec, sqlite3VdbeCurrentAddr(v)+1);
    for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
      int i;
      for(i=0; i<pWin->nArg; i++){
        sqlite3VdbeAddOp3(v, OP_Column, csrPrec, pWin->iArgCol+i, reg+i);
      }
      sqlite3VdbeAddOp3(v, OP_AggStep0, 1, reg, pWin->regAccum);
      sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
      sqlite3VdbeChangeP5(v, (u8)pWin->nArg);
    }
    if( pMWin->eStart==TK_PRECEDING ){
      sqlite3VdbeJumpHere(v, addrIfPos2);
    }
  }
  if( pMWin->eEnd==TK_FOLLOWING ){
    sqlite3VdbeJumpHere(v, addrIfPos1);
  }
  sqlite3VdbeAddOp2(v, OP_Goto, 0, addrNext);

  /* flush_partition_done: */
  sqlite3VdbeResolveLabel(v, addrDone);
  sqlite3VdbeAddOp1(v, OP_ResetSorter, pMWin->iEphCsr);
  sqlite3VdbeAddOp1(v, OP_Return, regFlushPart);

  /* Jump to here to skip over flush_partition */
  sqlite3VdbeJumpHere(v, addrGoto);
}

................................................................................
**
**========================================================================
**
** ROWS BETWEEN <expr> PRECEDING    AND <expr> PRECEDING
**
**   Replace the bit after "Rewind" in the above with:
**
**     if( (regFollow--)<=0 ){
**       AggStep (csr3)
**       Next (csr3)
**     }
**     AggFinal (xValue)
**     Gosub addrGosub
**     Next(csr)                  // if EOF goto flush_partition_done
**     if( (regPrec--)<=0 ){
**       AggStep (csr2, xInverse)
**       Next (csr2)
**     }
**
** ROWS BETWEEN <expr> FOLLOWING    AND <expr> FOLLOWING
**
**   regFollow = regFollow - regPrec
**   Rewind (csr,csr2,csr3)       // if EOF goto flush_partition_done
**     Aggstep (csr3)
**     Next(csr3)                 // if EOF fall-through
**     if( (regFollow--)<=0 ){
**       AggStep (csr2, xInverse)
**       Next (csr2)
**       if( (regPrec--)<=0 ){
**         AggFinal (xValue)
**         Gosub addrGosub
**         Next(csr)              // if EOF goto flush_partition_done
**       }
**     }
**
** ROWS BETWEEN UNBOUNDED PRECEDING AND <expr> PRECEDING
** ROWS BETWEEN <expr> FOLLOWING    AND UNBOUNDED FOLLOWING
**
**   Similar to the above, except with regPrec or regFollow set to infinity,
**   as appropriate.
**
**
**
*/
void sqlite3WindowCodeStep(
  Parse *pParse, 
................................................................................
  WhereInfo *pWInfo,
  int regGosub, 
  int addrGosub,
  int *pbLoop
){
  Window *pMWin = p->pWin;


  if( pMWin->eType==TK_ROWS 
   && (pMWin->eStart==TK_PRECEDING || pMWin->eEnd==TK_FOLLOWING)
   && (pMWin->eStart!=TK_FOLLOWING || pMWin->eEnd==TK_PRECEDING)
  ){
    *pbLoop = 0;
    windowCodeRowExprStep(pParse, p, pWInfo, regGosub, addrGosub);
    return;
  }

  *pbLoop = 1;
  windowCodeDefaultStep(pParse, p, pWInfo, regGosub, addrGosub);
}










>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>













|
|
>
>
|
|
<
>
|
|
|
|



|
|
|



<
<










>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>







 







|
|





|
|
|
|


>










>






|
|

|
|







 







|











|



|

|
|

|



|
|


<
|
|


>
|
|
|
>
|
|

|



|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<
<



|









|



|

|
|
<
<
<
<
<
<
<
<







|


|







 







|






|






|



|


|









|







 







>
|
<
<
<











88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

134
135
136
137
138
139
140
141
142
143
144
145
146
147


148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
...
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
...
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290

291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324


325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345








346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
...
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
...
593
594
595
596
597
598
599
600
601



602
603
604
605
606
607
608
609
610
611


  sqlite3VdbeAddOp2(v, OP_Integer, 0, regZero);
  sqlite3VdbeAddOp2(v, OP_MustBeInt, reg, sqlite3VdbeCurrentAddr(v)+2);
  sqlite3VdbeAddOp3(v, OP_Ge, regZero, sqlite3VdbeCurrentAddr(v)+2, reg);
  sqlite3VdbeAddOp2(v, OP_Halt, SQLITE_ERROR, OE_Abort);
  sqlite3VdbeAppendP4(v, (void*)azErr[bEnd], P4_STATIC);
}

static void windowAggStep(
  Parse *pParse, 
  Window *pMWin, 
  int csr,
  int bInverse, 
  int reg
){
  Vdbe *v = sqlite3GetVdbe(pParse);
  Window *pWin;
  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    int i;
    for(i=0; i<pWin->nArg; i++){
      sqlite3VdbeAddOp3(v, OP_Column, csr, pWin->iArgCol+i, reg+i);
    }
    sqlite3VdbeAddOp3(v, OP_AggStep0, bInverse, reg, pWin->regAccum);
    sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
    sqlite3VdbeChangeP5(v, (u8)pWin->nArg);
  }
}

/*
** ROWS BETWEEN <expr> PRECEDING    AND <expr> FOLLOWING
**
**   ...
**     if( new partition ){
**       Gosub flush_partition
**     }
**     Insert (record in eph-table)
**   sqlite3WhereEnd()
**   Gosub flush_partition
**
** flush_partition:
**   Once {
**     OpenDup (iEphCsr -> csrStart)
**     OpenDup (iEphCsr -> csrEnd)
**   }
**   regStart = <expr1>            // PRECEDING expression
**   regEnd = <expr2>          // FOLLOWING expression

**   if( regStart<0 || regEnd<0 ) throw exception!
**   Rewind (csr,csrStart,csrEnd)       // if EOF goto flush_partition_done
**     Aggstep (csrEnd)
**     Next(csrEnd)                     // if EOF fall-through
**     if( (regEnd--)<=0 ){
**       AggFinal (xValue)
**       Gosub addrGosub
**       Next(csr)                // if EOF goto flush_partition_done
**       if( (regStart--)<=0 ){
**         AggStep (csrStart, xInverse)
**         Next(csrStart)
**       }
**     }
** flush_partition_done:


**   ResetSorter (csr)
**   Return
**
** ROWS BETWEEN <expr> PRECEDING    AND CURRENT ROW
** ROWS BETWEEN CURRENT ROW         AND <expr> FOLLOWING
** ROWS BETWEEN <expr> PRECEDING    AND UNBOUNDED FOLLOWING
** ROWS BETWEEN UNBOUNDED PRECEDING AND <expr> FOLLOWING
**
**   These are similar to the above. For "CURRENT ROW", intialize the
**   register to 0. For "UNBOUNDED ..." to infinity.
**
** ROWS BETWEEN <expr> FOLLOWING    AND <expr> FOLLOWING
**
**   regEnd = regEnd - regStart
**   Rewind (csr,csrStart,csrEnd)   // if EOF goto flush_partition_done
**     Aggstep (csrEnd)
**     Next(csrEnd)                 // if EOF fall-through
**     if( (regEnd--)<=0 ){
**       AggStep (csrStart, xInverse)
**       Next (csrStart)
**       if( (regStart--)<=0 ){
**         AggFinal (xValue)
**         Gosub addrGosub
**         Next(csr)              // if EOF goto flush_partition_done
**       }
**     }
**
** ROWS BETWEEN <expr> PRECEDING    AND <expr> PRECEDING
**
**   Replace the bit after "Rewind" in the above with:
**
**     if( (regEnd--)<=0 ){
**       AggStep (csrEnd)
**       Next (csrEnd)
**     }
**     AggFinal (xValue)
**     Gosub addrGosub
**     Next(csr)                  // if EOF goto flush_partition_done
**     if( (regStart--)<=0 ){
**       AggStep (csr2, xInverse)
**       Next (csr2)
**     }
**
*/
static void windowCodeRowExprStep(
  Parse *pParse, 
  Select *p,
  WhereInfo *pWInfo,
  int regGosub, 
................................................................................
  Window *pMWin = p->pWin;
  Vdbe *v = sqlite3GetVdbe(pParse);
  Window *pWin;
  int k;
  int iSubCsr = p->pSrc->a[0].iCursor;
  int nSub = p->pSrc->a[0].pTab->nCol;
  int regFlushPart;               /* Register for "Gosub flush_partition" */
  int lblFlushPart;               /* Label for "Gosub flush_partition" */
  int lblFlushDone;               /* Label for "Gosub flush_partition_done" */

  int reg = pParse->nMem+1;
  int regRecord = reg+nSub;
  int regRowid = regRecord+1;
  int addr;
  int csrStart = pParse->nTab++;
  int csrEnd = pParse->nTab++;
  int regStart;                    /* Value of <expr> PRECEDING */
  int regEnd;                      /* Value of <expr> FOLLOWING */
  int addrNext;
  int addrGoto;
  int addrTop;
  int addrIfPos1;
  int addrIfPos2;

  assert( pMWin->eStart==TK_PRECEDING 
       || pMWin->eStart==TK_CURRENT 
       || pMWin->eStart==TK_UNBOUNDED 
  );
  assert( pMWin->eEnd==TK_FOLLOWING 
       || pMWin->eEnd==TK_CURRENT 
       || pMWin->eEnd==TK_UNBOUNDED 
       || pMWin->eEnd==TK_PRECEDING 
  );

  pParse->nMem += nSub + 2;

  /* Allocate register and label for the "flush_partition" sub-routine. */
  regFlushPart = ++pParse->nMem;
  lblFlushPart = sqlite3VdbeMakeLabel(v);
  lblFlushDone = sqlite3VdbeMakeLabel(v);

  regStart = ++pParse->nMem;
  regEnd = ++pParse->nMem;

  /* Martial 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);
  }
  sqlite3VdbeAddOp3(v, OP_MakeRecord, reg, nSub, regRecord);
................................................................................
    int addrJump = 0;
    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, addr+4, addr+2);
    sqlite3VdbeAddOp2(v, OP_Gosub, regFlushPart, lblFlushPart);
    sqlite3VdbeAddOp3(v, OP_Copy, regNewPart, pMWin->regPart, nPart);
  }

  /* 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);
  addrGoto = sqlite3VdbeAddOp0(v, OP_Goto);

  /* flush_partition: */
  sqlite3VdbeResolveLabel(v, lblFlushPart);
  sqlite3VdbeAddOp2(v, OP_Once, 0, sqlite3VdbeCurrentAddr(v)+3);
  sqlite3VdbeAddOp2(v, OP_OpenDup, csrStart, pMWin->iEphCsr);
  sqlite3VdbeAddOp2(v, OP_OpenDup, csrEnd, pMWin->iEphCsr);

  /* If either regStart or regEnd are not non-negative integers, throw 
  ** an exception.  */
  if( pMWin->pStart ){
    assert( pMWin->eStart==TK_PRECEDING );
    sqlite3ExprCode(pParse, pMWin->pStart, regStart);
    windowCheckFrameValue(pParse, regStart, 0);
  }
  if( pMWin->pEnd ){

    sqlite3ExprCode(pParse, pMWin->pEnd, regEnd);
    windowCheckFrameValue(pParse, regEnd, 1);
  }

  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regResult);
    sqlite3VdbeAddOp2(v, OP_Null, 0, pWin->regAccum);
  }

  sqlite3VdbeAddOp2(v, OP_Rewind, pMWin->iEphCsr, lblFlushDone);
  sqlite3VdbeAddOp2(v, OP_Rewind, csrStart, lblFlushDone);
  sqlite3VdbeChangeP5(v, 1);
  sqlite3VdbeAddOp2(v, OP_Rewind, csrEnd, lblFlushDone);
  sqlite3VdbeChangeP5(v, 1);

  /* Invoke AggStep function for each window function using the row that
  ** csrEnd currently points to. Or, if csrEnd is already at EOF,
  ** do nothing.  */
  addrTop = sqlite3VdbeCurrentAddr(v);
  if( pMWin->eEnd==TK_PRECEDING ){
    addrIfPos1 = sqlite3VdbeAddOp3(v, OP_IfPos, regEnd, 0 , 1);
  }
  sqlite3VdbeAddOp2(v, OP_Next, csrEnd, sqlite3VdbeCurrentAddr(v)+2);
  addr = sqlite3VdbeAddOp0(v, OP_Goto);
  windowAggStep(pParse, pMWin, csrEnd, 0, reg);
  if( pMWin->eEnd==TK_UNBOUNDED ){
    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrTop);
    sqlite3VdbeJumpHere(v, addr);
    addrTop = sqlite3VdbeCurrentAddr(v);
  }else{
    sqlite3VdbeJumpHere(v, addr);
    if( pMWin->eEnd==TK_PRECEDING ){
      sqlite3VdbeJumpHere(v, addrIfPos1);
    }


  }

  if( pMWin->eEnd==TK_FOLLOWING ){
    addrIfPos1 = sqlite3VdbeAddOp3(v, OP_IfPos, regEnd, 0 , 1);
  }
  for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
    sqlite3VdbeAddOp3(v, 
        OP_AggFinal, pWin->regAccum, pWin->nArg, pWin->regResult
    );
    sqlite3VdbeAppendP4(v, pWin->pFunc, P4_FUNCDEF);
  }
  sqlite3VdbeAddOp2(v, OP_Gosub, regGosub, addrGosub);
  sqlite3VdbeAddOp2(v, OP_Next, pMWin->iEphCsr, sqlite3VdbeCurrentAddr(v)+2);
  sqlite3VdbeAddOp2(v, OP_Goto, 0, lblFlushDone);

  if( pMWin->eStart==TK_CURRENT || pMWin->eStart==TK_PRECEDING ){
    if( pMWin->eStart==TK_PRECEDING ){
      addrIfPos2 = sqlite3VdbeAddOp3(v, OP_IfPos, regStart, 0 , 1);
    }
    sqlite3VdbeAddOp2(v, OP_Next, csrStart, sqlite3VdbeCurrentAddr(v)+1);
    windowAggStep(pParse, pMWin, csrStart, 1, reg);








    if( pMWin->eStart==TK_PRECEDING ){
      sqlite3VdbeJumpHere(v, addrIfPos2);
    }
  }
  if( pMWin->eEnd==TK_FOLLOWING ){
    sqlite3VdbeJumpHere(v, addrIfPos1);
  }
  sqlite3VdbeAddOp2(v, OP_Goto, 0, addrTop);

  /* flush_partition_done: */
  sqlite3VdbeResolveLabel(v, lblFlushDone);
  sqlite3VdbeAddOp1(v, OP_ResetSorter, pMWin->iEphCsr);
  sqlite3VdbeAddOp1(v, OP_Return, regFlushPart);

  /* Jump to here to skip over flush_partition */
  sqlite3VdbeJumpHere(v, addrGoto);
}

................................................................................
**
**========================================================================
**
** ROWS BETWEEN <expr> PRECEDING    AND <expr> PRECEDING
**
**   Replace the bit after "Rewind" in the above with:
**
**     if( (regEnd--)<=0 ){
**       AggStep (csr3)
**       Next (csr3)
**     }
**     AggFinal (xValue)
**     Gosub addrGosub
**     Next(csr)                  // if EOF goto flush_partition_done
**     if( (regStart--)<=0 ){
**       AggStep (csr2, xInverse)
**       Next (csr2)
**     }
**
** ROWS BETWEEN <expr> FOLLOWING    AND <expr> FOLLOWING
**
**   regEnd = regEnd - regStart
**   Rewind (csr,csr2,csr3)       // if EOF goto flush_partition_done
**     Aggstep (csr3)
**     Next(csr3)                 // if EOF fall-through
**     if( (regEnd--)<=0 ){
**       AggStep (csr2, xInverse)
**       Next (csr2)
**       if( (regStart--)<=0 ){
**         AggFinal (xValue)
**         Gosub addrGosub
**         Next(csr)              // if EOF goto flush_partition_done
**       }
**     }
**
** ROWS BETWEEN UNBOUNDED PRECEDING AND <expr> PRECEDING
** ROWS BETWEEN <expr> FOLLOWING    AND UNBOUNDED FOLLOWING
**
**   Similar to the above, except with regStart or regEnd set to infinity,
**   as appropriate.
**
**
**
*/
void sqlite3WindowCodeStep(
  Parse *pParse, 
................................................................................
  WhereInfo *pWInfo,
  int regGosub, 
  int addrGosub,
  int *pbLoop
){
  Window *pMWin = p->pWin;

  if( pMWin->pStart || pMWin->pEnd ){
    assert( pMWin->eType==TK_ROWS );



    *pbLoop = 0;
    windowCodeRowExprStep(pParse, p, pWInfo, regGosub, addrGosub);
    return;
  }

  *pbLoop = 1;
  windowCodeDefaultStep(pParse, p, pWInfo, regGosub, addrGosub);
}

Changes to test/window2.tcl. 

214
215
216
217
218
219
220







































221
222
223
224
225
226
227


execsql_test 2.13 {
  SELECT a, sum(d) OVER (
    ORDER BY d 
    ROWS BETWEEN 2 PRECEDING AND UNBOUNDED FOLLOWING
  ) FROM t1
}









































==========

puts $::fd finish_test
==========









>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>








214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266


execsql_test 2.13 {
  SELECT a, sum(d) OVER (
    ORDER BY d 
    ROWS BETWEEN 2 PRECEDING AND UNBOUNDED FOLLOWING
  ) FROM t1
}

execsql_test 2.14 {
  SELECT a, sum(d) OVER (
    ORDER BY d 
    ROWS BETWEEN 3 PRECEDING AND 1 PRECEDING
  ) FROM t1
}

execsql_test 2.15 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN 1 PRECEDING AND 0 PRECEDING
  ) FROM t1
}

execsql_test 2.16 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING
  ) FROM t1
}

execsql_test 2.17 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN 1 PRECEDING AND 2 PRECEDING
  ) FROM t1
}

execsql_test 2.18 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN UNBOUNDED PRECEDING AND 2 PRECEDING
  ) FROM t1
}


==========

puts $::fd finish_test
==========

Changes to test/window2.test. 

126
127
128
129
130
131
132







































133
134
135
136
137
138
139

do_execsql_test 2.13 {
  SELECT a, sum(d) OVER (
    ORDER BY d 
    ROWS BETWEEN 2 PRECEDING AND UNBOUNDED FOLLOWING
  ) FROM t1
} {1 21   2 21   3 21   4 20   5 18   6 15}








































#==========================================================================

finish_test
#==========================================================================

do_execsql_test 3.1 {
  SELECT a, sum(d) OVER (








>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>








126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178

do_execsql_test 2.13 {
  SELECT a, sum(d) OVER (
    ORDER BY d 
    ROWS BETWEEN 2 PRECEDING AND UNBOUNDED FOLLOWING
  ) FROM t1
} {1 21   2 21   3 21   4 20   5 18   6 15}

do_execsql_test 2.14 {
  SELECT a, sum(d) OVER (
    ORDER BY d 
    ROWS BETWEEN 3 PRECEDING AND 1 PRECEDING
  ) FROM t1
} {1 {}   2 1   3 3   4 6   5 9   6 12}

do_execsql_test 2.15 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN 1 PRECEDING AND 0 PRECEDING
  ) FROM t1
} {2 2   4 6   6 10   1 1   3 4   5 8}

do_execsql_test 2.16 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING
  ) FROM t1
} {2 {}   4 2   6 4   1 {}   3 1   5 3}

do_execsql_test 2.17 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN 1 PRECEDING AND 2 PRECEDING
  ) FROM t1
} {2 {}   4 {}   6 {}   1 {}   3 {}   5 {}}

do_execsql_test 2.18 {
  SELECT a, sum(d) OVER (
    PARTITION BY b
    ORDER BY d 
    ROWS BETWEEN UNBOUNDED PRECEDING AND 2 PRECEDING
  ) FROM t1
} {2 {}   4 {}   6 2   1 {}   3 {}   5 1}

#==========================================================================

finish_test
#==========================================================================

do_execsql_test 3.1 {
  SELECT a, sum(d) OVER (

This page was generated in about 0.011s by Fossil 2.11 [4dbd4e33c4] 2020-02-16 15:25:00