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Minor optimization in sqlite3WindowCodeStep().

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FossilOrigin-Name: b1322ffb6e63a110998068bf4f0a903028bd4fc0464ae1e517d745fb46423f39
This commit is contained in:
dan
2019-03-13 08:28:51 +00:00
parent bb40727857
commit d446165f7d
3 changed files with 13 additions and 10 deletions
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9
src/window.c
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@@ -2114,7 +2114,6 @@ void sqlite3WindowCodeStep(
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 */
@@ -2122,7 +2121,7 @@ void sqlite3WindowCodeStep(
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 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 */
@@ -2130,6 +2129,7 @@ void sqlite3WindowCodeStep(
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 */
@@ -2154,11 +2154,13 @@ void sqlite3WindowCodeStep(
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;
regFlushPart = ++pParse->nMem;
/* If the window frame contains an "<expr> PRECEDING" or "<expr> FOLLOWING"
** clause, allocate registers to store the results of evaluating each
@@ -2203,6 +2205,7 @@ void sqlite3WindowCodeStep(
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);