diff --git a/utils/funcexp/func_concat.cpp b/utils/funcexp/func_concat.cpp
index 744b1c8ea..dc07876cb 100644
--- a/utils/funcexp/func_concat.cpp
+++ b/utils/funcexp/func_concat.cpp
@@ -55,10 +55,13 @@ string Func_concat::getStrVal(Row& row,
 								bool& isNull,
 								CalpontSystemCatalog::ColType&)
 {
-	string ret = stringValue(parm[0], row, isNull);
+	string ret;
+    string tmp;
+    stringValue(parm[0], row, isNull, ret);
 
 	for ( unsigned int id = 1 ; id < parm.size() ; id++) {
-		ret.append( stringValue(parm[id], row, isNull) );
+		stringValue(parm[id], row, isNull, tmp);
+        ret.append(tmp);
 	}
 
 	return ret;
diff --git a/utils/funcexp/func_concat_ws.cpp b/utils/funcexp/func_concat_ws.cpp
index 7a236cfea..2718f20b3 100644
--- a/utils/funcexp/func_concat_ws.cpp
+++ b/utils/funcexp/func_concat_ws.cpp
@@ -49,7 +49,8 @@ string Func_concat_ws::getStrVal(Row& row,
 								bool& isNull,
 								CalpontSystemCatalog::ColType&)
 {
-	string delim = stringValue(parm[0], row, isNull);
+	string delim;
+    stringValue(parm[0], row, isNull, delim);
 	if (isNull)
 		return "";
 
@@ -62,7 +63,8 @@ string Func_concat_ws::getStrVal(Row& row,
 
 	for ( unsigned int id = 1 ; id < parm.size() ; id++) 
 	{
-		string tstr = stringValue(parm[id], row, isNull); 
+		string tstr;
+        stringValue(parm[id], row, isNull, tstr); 
 		if (isNull)
 		{
 			isNull = false;
@@ -88,9 +90,11 @@ string Func_concat_ws::getStrVal(Row& row,
 
 #else
 	string str;
+    string tmp;
 	for ( uint32_t i = 1 ; i < parm.size() ; i++) 
 	{
-		str += string(stringValue(parm[i], row, isNull).c_str()); 
+		string(stringValue(parm[i], row, isNull).c_str(), tmp);
+        str += tmp;
 
 		if (isNull)
 		{
diff --git a/utils/funcexp/func_elt.cpp b/utils/funcexp/func_elt.cpp
index 521fc5ea5..4bdda1e1f 100644
--- a/utils/funcexp/func_elt.cpp
+++ b/utils/funcexp/func_elt.cpp
@@ -95,7 +95,9 @@ string Func_elt::getStrVal(rowgroup::Row& row,
 		return "";
 	}
 
-	return stringValue(parm[number], row, isNull);
+    std::string ret;
+	stringValue(parm[number], row, isNull, ret);
+    return ret;
 
 }
 
diff --git a/utils/funcexp/func_insert.cpp b/utils/funcexp/func_insert.cpp
index 519f860bc..1c6750e69 100644
--- a/utils/funcexp/func_insert.cpp
+++ b/utils/funcexp/func_insert.cpp
@@ -86,12 +86,14 @@ std::string Func_insert::getStrVal(rowgroup::Row& row,
 						FunctionParm& fp,
 						bool& isNull,
 						execplan::CalpontSystemCatalog::ColType&)
-{	
-	const string& tstr = stringValue(fp[0], row, isNull);
+{
+	string tstr;
+    stringValue(fp[0], row, isNull, tstr);
 	if (isNull)
 		return "";
 
-	const string& tnewstr = stringValue(fp[3], row, isNull);
+	string tnewstr;
+    stringValue(fp[3], row, isNull, tnewstr);
 	if (isNull)
 		return "";
 
diff --git a/utils/funcexp/func_repeat.cpp b/utils/funcexp/func_repeat.cpp
index b962e6690..e08cb1fb4 100644
--- a/utils/funcexp/func_repeat.cpp
+++ b/utils/funcexp/func_repeat.cpp
@@ -61,7 +61,9 @@ std::string Func_repeat::getStrVal(rowgroup::Row& row,
 						bool& isNull,
 						execplan::CalpontSystemCatalog::ColType& op_ct)
 {
-	string str = stringValue(fp[0], row, isNull);
+	string str;
+
+    stringValue(fp[0], row, isNull, str);
 
 	if (str.empty() || str == "")
 		return "";
diff --git a/utils/funcexp/func_reverse.cpp b/utils/funcexp/func_reverse.cpp
index 41ffbb198..1ae8b9f68 100644
--- a/utils/funcexp/func_reverse.cpp
+++ b/utils/funcexp/func_reverse.cpp
@@ -65,7 +65,8 @@ std::string Func_reverse::getStrVal(rowgroup::Row& row,
 						bool& isNull,
 						execplan::CalpontSystemCatalog::ColType&)
 {
-	string str = stringValue(fp[0], row, isNull);
+	string str;
+    stringValue(fp[0], row, isNull, str);
 
 	// We used to reverse in the string buffer, but that doesn't
 	// work for all compilers as some re-use the buffer on simple
diff --git a/utils/funcexp/functor_str.h b/utils/funcexp/functor_str.h
index e3c97cca8..e54511b36 100644
--- a/utils/funcexp/functor_str.h
+++ b/utils/funcexp/functor_str.h
@@ -85,7 +85,7 @@ public:
 
 
 protected:
-	const std::string& stringValue(execplan::SPTP& fp, rowgroup::Row& row, bool& isNull)
+	const void stringValue(execplan::SPTP& fp, rowgroup::Row& row, bool& isNull, std::string& fFloatStr)
 	{
 		// Bug3788, use the shorter of fixed or scientific notation for floating point values.
 		// [ the default format in treenode.h is fixed-point notation ]
@@ -103,7 +103,8 @@ protected:
             break;
 
 			default:
-				return fp->data()->getStrVal(row, isNull);
+				fFloatStr = fp->data()->getStrVal(row, isNull);
+                return;
 			break;
 		}
         exponent = (int)floor(log10( fabs(floatVal)));
@@ -121,10 +122,7 @@ protected:
             fFloatStr += buf;
         }
 
-        return fFloatStr;
 	}
-
-	std::string fFloatStr;
 };