diff --git a/velox/exec/FilterProject.cpp b/velox/exec/FilterProject.cpp
index a4311b24f0cd..43d15d343f21 100644
--- a/velox/exec/FilterProject.cpp
+++ b/velox/exec/FilterProject.cpp
@@ -56,12 +56,8 @@ FilterProject::FilterProject(
       project_(project),
       filter_(filter) {}
 
-void FilterProject::ensureInitialized() {
-  if (initialized_) {
-    VELOX_CHECK_NULL(filter_);
-    VELOX_CHECK_NULL(project_);
-    return;
-  }
+void FilterProject::initialize() {
+  Operator::initialize();
   std::vector<core::TypedExprPtr> allExprs;
   if (hasFilter_) {
     VELOX_CHECK_NOT_NULL(filter_);
@@ -102,13 +98,11 @@ void FilterProject::ensureInitialized() {
       }
     }
   }
-  initialized_ = true;
   filter_.reset();
   project_.reset();
 }
 
 void FilterProject::addInput(RowVectorPtr input) {
-  ensureInitialized();
   input_ = std::move(input);
   numProcessedInputRows_ = 0;
   if (!resultProjections_.empty()) {
@@ -139,7 +133,6 @@ bool FilterProject::isFinished() {
 }
 
 RowVectorPtr FilterProject::getOutput() {
-  ensureInitialized();
   if (allInputProcessed()) {
     return nullptr;
   }
diff --git a/velox/exec/FilterProject.h b/velox/exec/FilterProject.h
index 03e749a4bef6..e4eaf396af5f 100644
--- a/velox/exec/FilterProject.h
+++ b/velox/exec/FilterProject.h
@@ -71,7 +71,7 @@ class FilterProject : public Operator {
     return Export{exprs_.get(), hasFilter_, &resultProjections_};
   }
 
-  void ensureInitialized();
+  void initialize() override;
 
  private:
   // Tests if 'numProcessedRows_' equals to the length of input_ and clears
diff --git a/velox/experimental/wave/exec/ToWave.cpp b/velox/experimental/wave/exec/ToWave.cpp
index f9b9cae638e7..ddccfb3b5868 100644
--- a/velox/experimental/wave/exec/ToWave.cpp
+++ b/velox/experimental/wave/exec/ToWave.cpp
@@ -355,10 +355,6 @@ bool CompileState::compile() {
   // them during the transformation.
   driver_.initializeOperators();
   for (; operatorIndex < operators.size(); ++operatorIndex) {
-    if (auto filterProject = dynamic_cast<velox::exec::FilterProject*>(
-            operators[operatorIndex])) {
-      filterProject->ensureInitialized();
-    }
     if (!addOperator(operators[operatorIndex], nodeIndex, outputType)) {
       break;
     }