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The OP_SeekScan opcode is a no-op if the cursor is not pointing to a valid

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row upon entry.

FossilOrigin-Name: 4afc96b5fe80bd192a23e0230edc207e641931c3bf48296b1a385c786386f1b7
This commit is contained in:
drh
2020-09-29 23:52:25 +00:00
parent 0b2949c36e
commit a54e1b1fc8
3 changed files with 11 additions and 13 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Coverage\stesting\sof\sthe\sOP_SeekScan\sopcode.\s\sFix\sa\sproblem\sthat\scomes\sup\swhen\nOP_SeekScan\sreaches\sthe\send\sof\sthe\stable.
D 2020-09-29T20:22:20.000
C The\sOP_SeekScan\sopcode\sis\sa\sno-op\sif\sthe\scursor\sis\snot\spointing\sto\sa\svalid\nrow\supon\sentry.
D 2020-09-29T23:52:25.083
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -607,7 +607,7 @@ F src/upsert.c 2920de71b20f04fe25eb00b655d086f0ba60ea133c59d7fa3325c49838818e78
F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
F src/util.c c0c7977de7ef9b8cb10f6c85f2d0557889a658f817b0455909a49179ba4c8002
F src/vacuum.c 492422c1463c076473bae1858799c7a0a5fe87a133d1223239447c422cd26286
F src/vdbe.c a5f9dbd62905ce5f7fde94c4b6e9d24eeb0e1844a4f352d7ce7b447bad62afcb
F src/vdbe.c 015caaa6afdce7cfa4f304b76cce6caaecc73c2fa36268d07de4df555dd33336
F src/vdbe.h 83603854bfa5851af601fc0947671eb260f4363e62e960e8a994fb9bbcd2aaa1
F src/vdbeInt.h 3ca5e9fd6e095a8b6cf6bc3587a46fc93499503b2fe48951e1034ba9e2ce2f6e
F src/vdbeapi.c c5e7cb2ab89a24d7f723e87b508f21bfb1359a04db5277d8a99fd1e015c12eb9
@@ -1880,7 +1880,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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2
manifest.uuid
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@@ -1 +1 @@
9e57e758a6a33f54d28a546b4eebfb5cfacef30dc4e0207e43bb9d2c06fc3439
4afc96b5fe80bd192a23e0230edc207e641931c3bf48296b1a385c786386f1b7

10
src/vdbe.c
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@@ -4407,10 +4407,8 @@ seek_not_found:
** is the desired entry that we want the cursor SeekGE.P1 to be pointing
** to. Call this SeekGE.P4/P5 row the "target".
**
** If the OP_SeekGE opcode that immediately follows this opcode has
** never run before, which is to say if the SeekGE.P1 cursor is not pointing
** to a valid raow, then this opcode is a no-op and control passes
** through into the OP_SeekGE.
** If the SeekGE.P1 cursor is not currently pointing to a valid row,
** then this opcode is a no-op and control passes through into the OP_SeekGE.
**
** If the SeekGE.P1 cursor is pointing to a valid row, then that row
** might be the target row, or it might be near and slightly before the
@@ -4449,10 +4447,10 @@ case OP_SeekScan: {
assert( pC!=0 );
assert( pC->eCurType==CURTYPE_BTREE );
assert( !pC->isTable );
if( pC->nullRow ){
if( !sqlite3BtreeCursorIsValidNN(pC->uc.pCursor) ){
#ifdef SQLITE_DEBUG
if( db->flags&SQLITE_VdbeTrace ){
printf("... no prior seeks - fall through\n");
printf("... cursor not valid - fall through\n");
}
#endif
break;