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Improvements to the LEFT JOIN strength reduction optimization.

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FossilOrigin-Name: 548082dfab5d9484279ccc11cd2833ac131b54b7481372b576d7c28bbb3294ea
This commit is contained in:
drh 2019-10-11 16:01:21 +00:00
parent 8b4d0e2cba
commit 4a254f98e3
3 changed files with 13 additions and 9 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Ensure\sfts3/4\sprefix\sindexes\sare\sflushed\sto\sdisk\sbefore\san\s'optimize'\scommand.\sFix\sfor\s[745f1abc].
D 2019-10-11T15:33:13.752
C Improvements\sto\sthe\sLEFT\sJOIN\sstrength\sreduction\soptimization.
D 2019-10-11T16:01:21.642
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -477,7 +477,7 @@ F src/date.c e1d8ac7102f3f283e63e13867acb0efa33861cf34f0faf4cdbaf9fa7a1eb7041
F src/dbpage.c 135eb3b5e74f9ef74bde5cec2571192c90c86984fa534c88bf4a055076fa19b7
F src/dbstat.c c12833de69cb655751487d2c5a59607e36be1c58ba1f4bd536609909ad47b319
F src/delete.c d08c9e01a2664afd12edcfa3a9c6578517e8ff8735f35509582693adbe0edeaf
F src/expr.c 88de5e67b378731da9a45c592122c754693c2a095db61dcd1a0cc64bb72b6145
F src/expr.c 8e82108846bb8ad0651feb1672eb8aae82158b6240f5677bc72d6cdf80e9d7a8
F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
F src/fkey.c 6271fda51794b569d736eba4097d28f13080cd0c9eb66d5fcecb4b77336fae50
F src/func.c ed33e38cd642058182a31a3f518f2e34f4bbe53aa483335705c153c4d3e50b12
@ -1846,7 +1846,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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R b207e5537fa5845b32cb8d65da5d4e9f
U drh
Z 75f587b0cae941ddcaa1476b9bca25c8

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manifest.uuid
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@ -1 +1 @@
4ed905b18847d4dbf5a2570052abced338065f824137b90300f62d77b3159d80
548082dfab5d9484279ccc11cd2833ac131b54b7481372b576d7c28bbb3294ea

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src/expr.c
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@ -5231,8 +5231,12 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
int sqlite3ExprImpliesNonNullRow(Expr *p, int iTab){
Walker w;
p = sqlite3ExprSkipCollateAndLikely(p);
if( p && p->op==TK_NOTNULL ){
if( p==0 ) return 0;
if( p->op==TK_NOTNULL ){
p = p->pLeft;
}else if( p->op==TK_AND ){
if( sqlite3ExprImpliesNonNullRow(p->pLeft, iTab) ) return 1;
p = p->pRight;
}
w.xExprCallback = impliesNotNullRow;
w.xSelectCallback = 0;