Clean up sqlite_stat2 related code. Add test cases.
FossilOrigin-Name: aa728e06ce456fa42e68687bff6c7424460c31ef
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 277ffb4..da14167 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2833,6 +2833,7 @@
int sqlite3FindDb(sqlite3*, Token*);
int sqlite3FindDbName(sqlite3 *, const char *);
int sqlite3AnalysisLoad(sqlite3*,int iDB);
+void sqlite3DeleteIndexSamples(Index*);
void sqlite3DefaultRowEst(Index*);
void sqlite3RegisterLikeFunctions(sqlite3*, int);
int sqlite3IsLikeFunction(sqlite3*,Expr*,int*,char*);