Inline Function.replace() and remove unneeded null checks

h2/src/main/org/h2/expression/Function.java

@@ -1326,7 +1326,7 @@ public class Function extends Expression implements FunctionCall {
                 if (s2 == null) {
                     s2 = "";
                 }
-                result = ValueString.get(replace(s0, s1, s2),
+                result = ValueString.get(StringUtils.replaceAll(s0, s1, s2),
                         database.getMode().treatEmptyStringsAsNull);
             }
             break;
@@ -1980,13 +1980,6 @@ public class Function extends Expression implements FunctionCall {
         return s.substring(start, start + length);
     }
 
-    private static String replace(String s, String replace, String with) {
-        if (s == null || replace == null || with == null) {
-            return null;
-        }
-        return StringUtils.replaceAll(s, replace, with);
-    }
-
     private static String repeat(String s, int count) {
         StringBuilder buff = new StringBuilder(s.length() * count);
         while (count-- > 0) {