fix round crash (vesoft-inc#5773)

src/common/function/FunctionManager.cpp

@@ -584,7 +584,7 @@ FunctionManager::FunctionManager() {
         case Value::Type::FLOAT: {
           if (args.size() >= 2) {
             if (args[1].get().type() == Value::Type::INT) {
-              auto val = args[0].get().getFloat();
+              auto val = args[0].get().isInt() ? args[0].get().getInt() : args[0].get().getFloat();
               auto decimal = args[1].get().getInt();
               auto factor = pow(10.0, decimal);
 

tests/tck/features/expression/FunctionCall.feature

@@ -10,7 +10,7 @@ Feature: Function Call Expression
     When executing query:
       """
       YIELD sign(38) AS a, sign(-2) AS b, sign(0.421) AS c,
-            sign(-1.0) AS d, sign(0) AS e, sign(abs(-3)) AS f
+      sign(-1.0) AS d, sign(0) AS e, sign(abs(-3)) AS f
       """
     Then the result should be, in any order:
       | a | b  | c | d  | e | f |
@@ -185,6 +185,36 @@ Feature: Function Call Expression
       | result |
       | 0.0    |
 
+  Scenario: round int
+    When executing query:
+      """
+      YIELD round(12345, 2) as result
+      """
+    Then the result should be, in any order:
+      | result  |
+      | 12345.0 |
+    When executing query:
+      """
+      YIELD round(12345, 0) as result
+      """
+    Then the result should be, in any order:
+      | result  |
+      | 12345.0 |
+    When executing query:
+      """
+      YIELD round(12345, -2) as result
+      """
+    Then the result should be, in any order:
+      | result  |
+      | 12300.0 |
+    When executing query:
+      """
+      YIELD round(12345, -5) as result
+      """
+    Then the result should be, in any order:
+      | result |
+      | 0.0    |
+
   Scenario: error check
     When executing query:
       """