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More efficient removal of duplicates in recursive queries using the UNION

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compound operator.

FossilOrigin-Name: 06c2db875e6cabd81c2a153b2fa4aba03eaed268
This commit is contained in:
drh
2014-02-26 21:35:31 +00:00
parent 3852b68edd
commit 7e4efaecad
3 changed files with 13 additions and 11 deletions
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10
src/select.c
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@@ -818,14 +818,16 @@ static void selectInnerLoop(
r1 = sqlite3GetTempReg(pParse);
r2 = sqlite3GetTempRange(pParse, nKey+2);
r3 = r2+nKey+1;
sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r3);
if( eDest==SRT_DistQueue ){
/* If the destination is DistQueue, then cursor (iParm+1) is open
** on a second ephemeral index that holds all values every previously
** added to the queue. Only add this new value if it has never before
** been added */
addrTest = sqlite3VdbeAddOp4Int(v, OP_Found, iParm+1, 0, r3, 0);
** added to the queue. */
addrTest = sqlite3VdbeAddOp4Int(v, OP_Found, iParm+1, 0,
regResult, nResultCol);
VdbeCoverage(v);
}
sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nResultCol, r3);
if( eDest==SRT_DistQueue ){
sqlite3VdbeAddOp2(v, OP_IdxInsert, iParm+1, r3);
sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
}