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Improvements to the sqlite3ExprImpliesNonNullRow() theorem prover.

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FossilOrigin-Name: 3fde627616030ca0de87169467e2e453fdc91154942e3a3a92a221df5923b2d2
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drh
2019-04-01 19:42:42 +00:00
parent afb3f3c72c
commit d6db6598ca
3 changed files with 19 additions and 8 deletions
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manifest
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@@ -1,5 +1,5 @@
C Add\sa\stest\scase\sto\scover\sa\smissed\sVDBE\sbranch\sgenerated\sby\swindow.c.
D 2019-04-01T18:43:09.978
C Improvements\sto\sthe\ssqlite3ExprImpliesNonNullRow()\stheorem\sprover.
D 2019-04-01T19:42:42.832
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
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F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -469,7 +469,7 @@ F src/date.c ebe1dc7c8a347117bb02570f1a931c62dd78f4a2b1b516f4837d45b7d6426957
F src/dbpage.c 135eb3b5e74f9ef74bde5cec2571192c90c86984fa534c88bf4a055076fa19b7
F src/dbstat.c c12833de69cb655751487d2c5a59607e36be1c58ba1f4bd536609909ad47b319
F src/delete.c d08c9e01a2664afd12edcfa3a9c6578517e8ff8735f35509582693adbe0edeaf
F src/expr.c f2d0ecf68213770be4fad83128ce02e67667deebaa0a44061313f7e4f2a4ae28
F src/expr.c 7f39a0138ca8e07daaa25fccff97f43c2b29df1153b6e462d43fb23833be2eaf
F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
F src/fkey.c bd0138acdc008c1845ccf92f8e73787880562de649471804801c06fed814c765
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@@ -1815,7 +1815,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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Z 294bced1998ead69a391511a2008e481

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b36813d6467c82159bd3bb69d34ac28fc161a13052ca67d7cf9ad75e2aaea9d5
3fde627616030ca0de87169467e2e453fdc91154942e3a3a92a221df5923b2d2

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src/expr.c
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@@ -5032,6 +5032,17 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
*/
int sqlite3ExprImpliesNonNullRow(Expr *p, int iTab){
Walker w;
p = sqlite3ExprSkipCollate(p);
while( p ){
if( p->op==TK_NOTNULL ){
p = p->pLeft;
}else if( p->op==TK_AND ){
if( sqlite3ExprImpliesNonNullRow(p->pLeft, iTab) ) return 1;
p = p->pRight;
}else{
break;
}
}
w.xExprCallback = impliesNotNullRow;
w.xSelectCallback = 0;
w.xSelectCallback2 = 0;