Fix overzealous fts2 assertions WRT rowid 0 or lower. Only check that

docids are ascending if there was a prior docid set for the doclist,
ignore the initial docid of 0. (CVS 4026)

FossilOrigin-Name: ed3a131f1d3fe51d1e79bdfe1bfafa55f825afa9

ext/fts2/fts2.c

@@ -716,12 +716,18 @@ typedef struct DLWriter {
   DocListType iType;
   DataBuffer *b;
   sqlite_int64 iPrevDocid;
+#ifndef NDEBUG
+  int has_iPrevDocid;
+#endif
 } DLWriter;
 
 static void dlwInit(DLWriter *pWriter, DocListType iType, DataBuffer *b){
   pWriter->b = b;
   pWriter->iType = iType;
   pWriter->iPrevDocid = 0;
+#ifndef NDEBUG
+  pWriter->has_iPrevDocid = 0;
+#endif
 }
 static void dlwDestroy(DLWriter *pWriter){
   SCRAMBLE(pWriter);
@@ -780,11 +786,15 @@ static void dlwAdd(DLWriter *pWriter, sqlite_int64 iDocid){
   char c[VARINT_MAX];
   int n = putVarint(c, iDocid-pWriter->iPrevDocid);
 
-  assert( pWriter->iPrevDocid<iDocid );
+  /* Docids must ascend. */
+  assert( !pWriter->has_iPrevDocid || iDocid>pWriter->iPrevDocid );
   assert( pWriter->iType==DL_DOCIDS );
 
   dataBufferAppend(pWriter->b, c, n);
   pWriter->iPrevDocid = iDocid;
+#ifndef NDEBUG
+  pWriter->has_iPrevDocid = 1;
+#endif
 }
 
 /*******************************************************************/
@@ -961,10 +971,14 @@ static void plwInit(PLWriter *pWriter, DLWriter *dlw, sqlite_int64 iDocid){
 
   pWriter->dlw = dlw;
 
-  assert( iDocid>pWriter->dlw->iPrevDocid );
+  /* Docids must ascend. */
+  assert( !pWriter->dlw->has_iPrevDocid || iDocid>pWriter->dlw->iPrevDocid );
   n = putVarint(c, iDocid-pWriter->dlw->iPrevDocid);
   dataBufferAppend(pWriter->dlw->b, c, n);
   pWriter->dlw->iPrevDocid = iDocid;
+#ifndef NDEBUG
+  pWriter->dlw->has_iPrevDocid = 1;
+#endif
 
   pWriter->iColumn = 0;
   pWriter->iPos = 0;

manifest

@@ -1,5 +1,5 @@
-C Add\sthe\slarger\sSQLite\sicon\sto\sthe\srepository.\s(CVS\s4025)
+C Fix\soverzealous\sfts2\sassertions\sWRT\srowid\s0\sor\slower.\s\sOnly\scheck\sthat\ndocids\sare\sascending\sif\sthere\swas\sa\sprior\sdocid\sset\sfor\sthe\sdoclist,\nignore\sthe\sinitial\sdocid\sof\s0.\s(CVS\s4026)
-D 2007-05-19T11:50:36
+D 2007-05-21T21:59:18
 F Makefile.in a42354804b50c2708ce72cf79e4daa30f50191b5
 F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
 F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -36,7 +36,7 @@ F ext/fts1/fulltext.h 08525a47852d1d62a0be81d3fc3fe2d23b094efd
 F ext/fts1/simple_tokenizer.c 1844d72f7194c3fd3d7e4173053911bf0661b70d
 F ext/fts1/tokenizer.h 0c53421b832366d20d720d21ea3e1f6e66a36ef9
 F ext/fts2/README.txt 8c18f41574404623b76917b9da66fcb0ab38328d
-F ext/fts2/fts2.c 9e1f5942fc063f2d6778bc44372eba9b2b43eebd
+F ext/fts2/fts2.c 4c68ff4f2c95f1cb36d760c89b2a98d07a9dc518
 F ext/fts2/fts2.h 591916a822cfb6426518fdbf6069359119bc46eb
 F ext/fts2/fts2_hash.c b3f22116d4ef0bc8f2da6e3fdc435c86d0951a9b
 F ext/fts2/fts2_hash.h e283308156018329f042816eb09334df714e105e
@@ -235,7 +235,7 @@ F test/fts1j.test e4c0ffcd0ba2adce09c6b7b43ffd0749b5fda5c7
 F test/fts1k.test fdf295cb797ba6a2ef81ec41cb98df0ceb2e572c
 F test/fts1l.test 15c119ed2362b2b28d5300c0540a6a43eab66c36
 F test/fts1porter.test d86e9c3e0c7f8ff95add6582b4b585fb4e02b96d
-F test/fts2a.test 103fc178d134c54c44c1938a4331e9e2030792d9
+F test/fts2a.test 473a5c8b473a4e21a8e3fddaed1e59666e0c6ab7
 F test/fts2b.test 964abc0236c849c07ca1ae496bb25c268ae94816
 F test/fts2c.test ffb5a35230ac72c4354535c547965ce6824537c0
 F test/fts2d.test b7eaa671ca9a16997f3e5b158ee777ae21052b0b
@@ -494,7 +494,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
-P 315dc71b921ffba514271a2ed571d5f4162c775f
+P d7539c6e8b66d537307e70aac5f2001135151c78
-R 6690b927b9e60ea3f1ce16e28d14b75e
+R fc1fc4b99da3f2060e3c202b7bab5aec
-U drh
+U shess
-Z 34db7163f46344eeab9731ece1a3c204
+Z a33da34f6d94403bda46e441bbf9b0fa

manifest.uuid

@@ -1 +1 @@
-d7539c6e8b66d537307e70aac5f2001135151c78
+ed3a131f1d3fe51d1e79bdfe1bfafa55f825afa9

test/fts2a.test

@@ -11,7 +11,7 @@
 # This file implements regression tests for SQLite library.  The
 # focus of this script is testing the FTS2 module.
 #
-# $Id: fts2a.test,v 1.1 2006/10/19 23:36:26 shess Exp $
+# $Id: fts2a.test,v 1.2 2007/05/21 21:59:18 shess Exp $
 #
 
 set testdir [file dirname $argv0]
@@ -181,6 +181,22 @@ do_test fts2a-5.3 {
   execsql {SELECT rowid FROM t1 WHERE content MATCH NULL}
 } {}
 
-
+# Test the ability to handle non-positive rowids
+#
+do_test fts2a-6.0 {
+  execsql {INSERT INTO t1(rowid, content) VALUES(0, 'four five')}
+} {}
+do_test fts2a-6.1 {
+  execsql {SELECT content FROM t1 WHERE rowid = 0}
+} {{four five}}
+do_test fts2a-6.2 {
+  execsql {INSERT INTO t1(rowid, content) VALUES(-1, 'three four')}
+} {}
+do_test fts2a-6.3 {
+  execsql {SELECT content FROM t1 WHERE rowid = -1}
+} {{three four}}
+do_test fts2a-6.4 {
+  execsql {SELECT rowid FROM t1 WHERE t1 MATCH 'four'}
+} {-1 0 8 9 10 11 12 13 14 15 24 25 26 27 28 29 30 31}
 
 finish_test