Import SQLite 3.8.7.4.

third_party/sqlite/patches/0020-fts2-Interpret-foo-as-a-prefix-search.patch

-From 07efd3db8276f343fa9762a11ca3114ba8ffe532 Mon Sep 17 00:00:00 2001
-From: Matt Perry <mpcomplete@google.com>
-Date: Wed, 17 Dec 2008 00:50:50 +0000
-Subject: [PATCH 20/23] [fts2] Interpret "foo*" as a prefix search.
-
-By default it interpreted it as "foo *" (two tokens).
-
-Original review URL: http://codereview.chromium.org/14176
----
- third_party/sqlite/src/ext/fts2/fts2.c | 15 +++++++++++++++
- 1 file changed, 15 insertions(+)
-
-diff --git a/third_party/sqlite/src/ext/fts2/fts2.c b/third_party/sqlite/src/ext/fts2/fts2.c
-index 4945cd9..7d07137 100644
---- a/third_party/sqlite/src/ext/fts2/fts2.c
-+++ b/third_party/sqlite/src/ext/fts2/fts2.c
-@@ -3558,6 +3558,7 @@ static int tokenizeSegment(
-   int firstIndex = pQuery->nTerms;
-   int iCol;
-   int nTerm = 1;
-+  int iEndLast = -1;
-   
-   int rc = pModule->xOpen(pTokenizer, pSegment, nSegment, &pCursor);
-   if( rc!=SQLITE_OK ) return rc;
-@@ -3582,6 +3583,20 @@ static int tokenizeSegment(
-       pQuery->nextIsOr = 1;
-       continue;
-     }
-+
-+    /*
-+     * The ICU tokenizer considers '*' a break character, so the code below
-+     * sets isPrefix correctly, but since that code doesn't eat the '*', the
-+     * ICU tokenizer returns it as the next token.  So eat it here until a
-+     * better solution presents itself.
-+     */
-+    if( pQuery->nTerms>0 && nToken==1 && pSegment[iBegin]=='*' &&
-+        iEndLast==iBegin){
-+      pQuery->pTerms[pQuery->nTerms-1].isPrefix = 1;
-+      continue;
-+    }
-+    iEndLast = iEnd;
-+
-     queryAdd(pQuery, pToken, nToken);
-     if( !inPhrase && iBegin>0 && pSegment[iBegin-1]=='-' ){
-       pQuery->pTerms[pQuery->nTerms-1].isNot = 1;
--- 
-2.2.1
-