feat(readers): Control knob in row reader option (facebookincubator#15767)

Summary:
Pull Request resolved: facebookincubator#15767

See D88118026 for details on the control knob to branch on the different column reader and encoding behavior.

In order for OSS build to pass, we need to first land the velox PR and then advance velox hash.

Reviewed By: Yuhta

Differential Revision: D89134173

fbshipit-source-id: 28541200097f7520ff1013934cf81f515c252cde

Author: Huameng (Michael) Jiang

velox/dwio/common/Options.h

@@ -449,8 +449,16 @@ class RowReaderOptions {
     return trackRowSize_;
   }
 
-  void setTrackRowSize(bool value) {
-    trackRowSize_ = value;
+  void setTrackRowSize(bool trackRowSize) {
+    trackRowSize_ = trackRowSize;
+  }
+
+  bool passStringBuffersFromDecoder() const {
+    return passStringBuffersFromDecoder_;
+  }
+
+  void setPassStringBuffersFromDecoder(bool passStringBuffersFromDecoder) {
+    passStringBuffersFromDecoder_ = passStringBuffersFromDecoder;
   }
 
  private:
@@ -513,6 +521,7 @@ class RowReaderOptions {
 
   std::shared_ptr<FormatSpecificOptions> formatSpecificOptions_;
   bool trackRowSize_{false};
+  bool passStringBuffersFromDecoder_{true};
 };
 
 /// Options for creating a Reader.