[sql] Import reference version of SQLite 3.8.7.4.

third_party/sqlite/sqlite-src-3080704/test/tt3_index.c

+/*
+** 2014 December 9
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+**
+**     create_drop_index_1
+*/
+
+
+static char *create_drop_index_thread(int iTid, int iArg){
+  Error err = {0};                /* Error code and message */
+  Sqlite db = {0};                /* SQLite database connection */
+
+  while( !timetostop(&err) ){
+    opendb(&err, &db, "test.db", 0);
+
+    sql_script(&err, &db, 
+
+      "DROP INDEX IF EXISTS i1;"
+      "DROP INDEX IF EXISTS i2;"
+      "DROP INDEX IF EXISTS i3;"
+      "DROP INDEX IF EXISTS i4;"
+
+      "CREATE INDEX IF NOT EXISTS i1 ON t1(a);"
+      "CREATE INDEX IF NOT EXISTS i2 ON t1(b);"
+      "CREATE INDEX IF NOT EXISTS i3 ON t1(c);"
+      "CREATE INDEX IF NOT EXISTS i4 ON t1(d);"
+
+      "SELECT * FROM t1 ORDER BY a;"
+      "SELECT * FROM t1 ORDER BY b;"
+      "SELECT * FROM t1 ORDER BY c;"
+      "SELECT * FROM t1 ORDER BY d;"
+    );
+
+    closedb(&err, &db);
+  }
+
+  print_and_free_err(&err);
+  return sqlite3_mprintf("ok");
+}
+
+static void create_drop_index_1(int nMs){
+  Error err = {0};
+  Sqlite db = {0};
+  Threadset threads = {0};
+
+  opendb(&err, &db, "test.db", 1);
+  sql_script(&err, &db, 
+     "CREATE TABLE t1(a, b, c, d);"
+     "WITH data(x) AS (SELECT 1 UNION ALL SELECT x+1 FROM data WHERE x<100) "
+     "INSERT INTO t1 SELECT x,x,x,x FROM data;"
+  );
+  closedb(&err, &db);
+
+  setstoptime(&err, nMs);
+
+  sqlite3_enable_shared_cache(1);
+  launch_thread(&err, &threads, create_drop_index_thread, 0);
+  launch_thread(&err, &threads, create_drop_index_thread, 0);
+  launch_thread(&err, &threads, create_drop_index_thread, 0);
+  launch_thread(&err, &threads, create_drop_index_thread, 0);
+  launch_thread(&err, &threads, create_drop_index_thread, 0);
+  sqlite3_enable_shared_cache(0);
+
+  join_all_threads(&err, &threads);
+  print_and_free_err(&err);
+}