From eb3c7dd562b48c0d7f7caf269bb75d031ea25daf Mon Sep 17 00:00:00 2001
From: Aiee <18348405+Aiee@users.noreply.github.com>
Date: Wed, 21 Jul 2021 19:45:44 +0800
Subject: [PATCH] add isContainerExpr() interface

---
 src/common/expression/ContainerExpression.h | 12 ++++++++++++
 src/common/expression/Expression.h          |  4 ++++
 2 files changed, 16 insertions(+)

diff --git a/src/common/expression/ContainerExpression.h b/src/common/expression/ContainerExpression.h
index 236e3bd17..e3f675bdc 100644
--- a/src/common/expression/ContainerExpression.h
+++ b/src/common/expression/ContainerExpression.h
@@ -115,6 +115,10 @@ class ListExpression final : public Expression {
         return ListExpression::make(pool_, items);
     }
 
+    bool isContainerExpr() const override {
+        return true;
+    }
+
 private:
     explicit ListExpression(ObjectPool *pool) : Expression(pool, Kind::kList) {}
 
@@ -181,6 +185,10 @@ class SetExpression final : public Expression {
         return SetExpression::make(pool_, items);
     }
 
+    bool isContainerExpr() const override {
+        return true;
+    }
+
 private:
     explicit SetExpression(ObjectPool *pool) : Expression(pool, Kind::kSet) {}
 
@@ -247,6 +255,10 @@ class MapExpression final : public Expression {
         return MapExpression::make(pool_, items);
     }
 
+    bool isContainerExpr() const override {
+        return true;
+    }
+
 private:
     explicit MapExpression(ObjectPool *pool) : Expression(pool, Kind::kMap) {}
 
diff --git a/src/common/expression/Expression.h b/src/common/expression/Expression.h
index 873e06346..6fb379232 100644
--- a/src/common/expression/Expression.h
+++ b/src/common/expression/Expression.h
@@ -168,6 +168,10 @@ class Expression {
         return false;
     }
 
+    virtual bool isContainerExpr() const {
+        return false;
+    }
+
 protected:
     class Encoder final {
     public: