diff --git a/velox/exec/HashProbe.cpp b/velox/exec/HashProbe.cpp
index 2e93eb70d52d..0adcc13ffa7f 100644
--- a/velox/exec/HashProbe.cpp
+++ b/velox/exec/HashProbe.cpp
@@ -1018,7 +1018,7 @@ RowVectorPtr HashProbe::getOutputInternal(bool toSpillOutput) {
 
     // Intialize 'leftSemiProjectIsNull_' for null aware lft semi join.
     if (isLeftSemiProjectJoin(joinType_) && nullAware_) {
-      leftSemiProjectIsNull_.clearAll();
+      leftSemiProjectIsNull_.resize(outputTableRowsCapacity_, false);
     }
   }
 
@@ -1488,8 +1488,6 @@ int32_t HashProbe::evalFilter(int32_t numRows, int32_t offset) {
     static const char* kPassed = "passed";
 
     if (nullAware_) {
-      leftSemiProjectIsNull_.resize(numRows + offset, false);
-
       auto addLast = [&](auto row, std::optional<bool> passed) {
         if (passed.has_value()) {
           outputTableRows[numPassed] =
diff --git a/velox/vector/BaseVector.h b/velox/vector/BaseVector.h
index 0453a74305fe..82eb92799020 100644
--- a/velox/vector/BaseVector.h
+++ b/velox/vector/BaseVector.h
@@ -867,18 +867,6 @@ class BaseVector {
     storageByteCount_ = std::nullopt;
   }
 
-  // Slice a buffer with specific type.
-  //
-  // For boolean type and if the offset is not multiple of 8, return a shifted
-  // copy; otherwise return a BufferView into the original buffer (with shared
-  // ownership of original buffer).
-  static BufferPtr sliceBuffer(
-      const Type&,
-      const BufferPtr&,
-      vector_size_t offset,
-      vector_size_t length,
-      memory::MemoryPool*);
-
  protected:
   // Returns a brief summary of the vector. The default implementation includes
   // encoding, type, number of rows and number of nulls.