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Rearrange some code in the RowSet logic for clarity of presentation, while

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adding an /*OPTIMIZATION-IF-TRUE*/ comment.  It should operate identically.

FossilOrigin-Name: 5748e64376c1c2be5154a632d1527cfebbb9ec74
This commit is contained in:
drh 2016-04-28 18:53:08 +00:00
parent 75ab50ce8f
commit cb6d66becc
3 changed files with 20 additions and 17 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Use\scomments\sto\smark\sseveral\sbranches\sas\soptimizations.\s\sNo\schanges\sto\scode.
D 2016-04-28T14:15:12.903
C Rearrange\ssome\scode\sin\sthe\sRowSet\slogic\sfor\sclarity\sof\spresentation,\swhile\nadding\san\s/*OPTIMIZATION-IF-TRUE*/\scomment.\s\sIt\sshould\soperate\sidentically.
D 2016-04-28T18:53:08.454
F Makefile.in 9e816d0323e418fbc0f8b2c05fc14e0b3763d9e8
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 71b8b16cf9393f68e2e2035486ca104872558836
@ -376,7 +376,7 @@ F src/prepare.c 22df6171aec1d86904ed2ad30c2348a5748aa04e
F src/printf.c 63e6fb12bbe702dd664dc3703776c090383a5a26
F src/random.c ba2679f80ec82c4190062d756f22d0c358180696
F src/resolve.c b8f7174e5f8c33c44ded3a25a973d0bb89228c20
F src/rowset.c 9fe4b3ad7cc00944386bb600233d8f523de07a6e
F src/rowset.c d68d95e167cb234f51d655c9546f46752c9f6d45
F src/select.c fd4a7ce2937497181063cfedb92058ac89491a5d
F src/shell.c 14ff7f660530a52b117d110ba3390b7b2eb719b6
F src/sqlite.h.in 9984129d86243424b765fcb3f147c697bd20bb54
@ -1484,7 +1484,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
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P fcf85bfe50b254e825ee63a4cd0aa0b333b06eed
R 197c644a6cd9b0806f84f77482d9fe15
P 33e627472780b872716c504f2d585cc057c390a5
R a33e3686da943dcb038124577baa15b4
U drh
Z 413f6650964e5d2ab342130728703294
Z bac1d4beccda46e9aa1657c47d678425

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@ -1 +1 @@
33e627472780b872716c504f2d585cc057c390a5
5748e64376c1c2be5154a632d1527cfebbb9ec74

23
src/rowset.c
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@ -338,20 +338,23 @@ static struct RowSetEntry *rowSetNDeepTree(
if( *ppList==0 ){
return 0;
}
if( iDepth==1 ){
if( iDepth>1 ){ /*OPTIMIZATION-IF-TRUE*/
/* This branch cases a *balanced* tree to be generated. A valid tree
** is still generated without this branch, but it is wildly unbalanced
** and inefficient. */
pLeft = rowSetNDeepTree(ppList, iDepth-1);
p = *ppList;
if( p==0 ){
return pLeft;
}
p->pLeft = pLeft;
*ppList = p->pRight;
p->pRight = rowSetNDeepTree(ppList, iDepth-1);
}else{
p = *ppList;
*ppList = p->pRight;
p->pLeft = p->pRight = 0;
return p;
}
pLeft = rowSetNDeepTree(ppList, iDepth-1);
p = *ppList;
if( p==0 ){
return pLeft;
}
p->pLeft = pLeft;
*ppList = p->pRight;
p->pRight = rowSetNDeepTree(ppList, iDepth-1);
return p;
}