remove unnecessary internal_comparator param in newIterator

Summary:
solved https://github.com/facebook/rocksdb/issues/2604
Closes https://github.com/facebook/rocksdb/pull/2648

Differential Revision: D5504875

Pulled By: lightmark

fbshipit-source-id: c14bb62ccbdc9e7bda9cd914cae4ea0765d882ee

db/table_cache.cc

@@ -225,8 +225,7 @@ InternalIterator* TableCache::NewIterator(
   }
   InternalIterator* result = nullptr;
   if (s.ok()) {
-    result =
-      table_reader->NewIterator(options, arena, &icomparator, skip_filters);
+    result = table_reader->NewIterator(options, arena, skip_filters);
     if (create_new_table_reader) {
       assert(handle == nullptr);
       result->RegisterCleanup(&DeleteTableReader, table_reader, nullptr);

table/block_based_table_reader.cc

@@ -1545,11 +1545,12 @@ bool BlockBasedTable::PrefixMayMatch(const Slice& internal_key) {
   return may_match;
 }
 
-InternalIterator* BlockBasedTable::NewIterator(
-    const ReadOptions& read_options, Arena* arena,
-    const InternalKeyComparator* icomp, bool skip_filters) {
+InternalIterator* BlockBasedTable::NewIterator(const ReadOptions& read_options,
+                                               Arena* arena,
+                                               bool skip_filters) {
   return NewTwoLevelIterator(
-      new BlockEntryIteratorState(this, read_options, icomp, skip_filters),
+      new BlockEntryIteratorState(this, read_options,
+                                  &rep_->internal_comparator, skip_filters),
       NewIndexIterator(read_options), arena);
 }
 

table/block_based_table_reader.h

@@ -102,7 +102,6 @@ class BlockBasedTable : public TableReader {
   // @param skip_filters Disables loading/accessing the filter block
   InternalIterator* NewIterator(
       const ReadOptions&, Arena* arena = nullptr,
-      const InternalKeyComparator* icomparator = nullptr,
       bool skip_filters = false) override;
 
   InternalIterator* NewRangeTombstoneIterator(

table/cuckoo_table_reader.cc

@@ -364,8 +364,7 @@ extern InternalIterator* NewErrorInternalIterator(const Status& status,
                                                   Arena* arena);
 
 InternalIterator* CuckooTableReader::NewIterator(
-    const ReadOptions& read_options, Arena* arena,
-    const InternalKeyComparator* icomp, bool skip_filters) {
+    const ReadOptions& read_options, Arena* arena, bool skip_filters) {
   if (!status().ok()) {
     return NewErrorInternalIterator(
         Status::Corruption("CuckooTableReader status is not okay."), arena);

table/cuckoo_table_reader.h

@@ -47,7 +47,6 @@ class CuckooTableReader: public TableReader {
 
   InternalIterator* NewIterator(
       const ReadOptions&, Arena* arena = nullptr,
-      const InternalKeyComparator* icomparator = nullptr,
       bool skip_filters = false) override;
   void Prepare(const Slice& target) override;
 

table/mock_table.cc

@@ -28,7 +28,6 @@ stl_wrappers::KVMap MakeMockFile(
 
 InternalIterator* MockTableReader::NewIterator(const ReadOptions&,
                                                Arena* arena,
-                                               const InternalKeyComparator*,
                                                bool skip_filters) {
   return new MockTableIterator(table_);
 }

table/mock_table.h

@@ -40,7 +40,6 @@ class MockTableReader : public TableReader {
 
   InternalIterator* NewIterator(const ReadOptions&,
                                 Arena* arena,
-                                const InternalKeyComparator* = nullptr,
                                 bool skip_filters = false) override;
 
   Status Get(const ReadOptions&, const Slice& key, GetContext* get_context,

table/plain_table_reader.cc

@@ -191,7 +191,6 @@ void PlainTableReader::SetupForCompaction() {
 
 InternalIterator* PlainTableReader::NewIterator(const ReadOptions& options,
                                                 Arena* arena,
-                                                const InternalKeyComparator*,
                                                 bool skip_filters) {
   bool use_prefix_seek = !IsTotalOrderMode() && !options.total_order_seek;
   if (arena == nullptr) {

table/plain_table_reader.h

@@ -71,7 +71,7 @@ class PlainTableReader: public TableReader {
  public:
   static Status Open(const ImmutableCFOptions& ioptions,
                      const EnvOptions& env_options,
-                     const InternalKeyComparator& icomparator,
+                     const InternalKeyComparator& internal_comparator,
                      unique_ptr<RandomAccessFileReader>&& file,
                      uint64_t file_size, unique_ptr<TableReader>* table,
                      const int bloom_bits_per_key, double hash_table_ratio,
@@ -80,7 +80,6 @@ class PlainTableReader: public TableReader {
 
   InternalIterator* NewIterator(const ReadOptions&,
                                 Arena* arena = nullptr,
-                                const InternalKeyComparator* = nullptr,
                                 bool skip_filters = false) override;
 
   void Prepare(const Slice& target) override;

table/table_reader.h

@@ -40,7 +40,6 @@ class TableReader {
   //               option is effective only for block-based table format.
   virtual InternalIterator* NewIterator(const ReadOptions&,
                                         Arena* arena = nullptr,
-                                        const InternalKeyComparator* = nullptr,
                                         bool skip_filters = false) = 0;
 
   virtual InternalIterator* NewRangeTombstoneIterator(