Temporarily disable caching index/filter blocks

Summary:
Mixing index/filter blocks with data blocks resulted in some known
issues.  To make sure in next release our users won't be affected,
we added a new option in BlockBasedTableFactory::TableOption to
conceal this functionality for now.

This patch also introduced a BlockBasedTableReader::OpenOptions,
which avoids the "infinite" growth of parameters in
BlockBasedTableReader::Open().

Test Plan: make check

Reviewers: haobo, sdong, igor, dhruba

Reviewed By: igor

CC: leveldb, tnovak

Differential Revision: https://reviews.facebook.net/D15327

table/table_test.cc

@@ -243,13 +243,12 @@ class BlockConstructor: public Constructor {
 
 class BlockBasedTableConstructor: public Constructor {
  public:
-  explicit BlockBasedTableConstructor(
-      const Comparator* cmp)
-      : Constructor(cmp) {
-  }
+  explicit BlockBasedTableConstructor(const Comparator* cmp)
+      : Constructor(cmp) {}
   ~BlockBasedTableConstructor() {
     Reset();
   }
+
   virtual Status FinishImpl(const Options& options, const KVMap& data) {
     Reset();
     sink_.reset(new StringSink());
@@ -277,7 +276,6 @@ class BlockBasedTableConstructor: public Constructor {
     // Open the table
     uniq_id_ = cur_uniq_id_++;
     source_.reset(new StringSource(sink_->contents(), uniq_id_));
-    unique_ptr<TableFactory> table_factory;
     return options.table_factory->GetTableReader(options, soptions,
                                                  std::move(source_),
                                                  sink_->contents().size(),
@@ -979,6 +977,11 @@ TEST(TableTest, BlockCacheTest) {
   options.create_if_missing = true;
   options.statistics = CreateDBStatistics();
   options.block_cache = NewLRUCache(1024);
+
+  // Enable the cache for index/filter blocks
+  BlockBasedTableOptions table_options;
+  table_options.cache_index_and_filter_blocks = true;
+  options.table_factory.reset(new BlockBasedTableFactory(table_options));
   std::vector<std::string> keys;
   KVMap kvmap;
 
@@ -1292,7 +1295,6 @@ TEST(MemTableTest, Simple) {
   delete memtable->Unref();
 }
 
-
 }  // namespace rocksdb
 
 int main(int argc, char** argv) {