Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/574#discussion_r79155363
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/FunctionImplementationRegistry.java
 ---
    @@ -186,4 +226,105 @@ public boolean isFunctionComplexOutput(String name) {
         return false;
       }
     
    +  public RemoteFunctionRegistry getRemoteFunctionRegistry() {
    +    return remoteFunctionRegistry;
    +  }
    +
    +  public List<Func> validate(Path path) throws IOException {
    +    URL url = path.toUri().toURL();
    +    URL[] urls = {url};
    +    ClassLoader classLoader = new URLClassLoader(urls);
    +    return drillFuncRegistry.validate(path.getName(), scan(classLoader, 
path, urls));
    +  }
    +
    +  public void register(String jarName, ScanResult classpathScan, 
ClassLoader classLoader) {
    +    drillFuncRegistry.register(jarName, classpathScan, classLoader);
    +  }
    +
    +  public void unregister(String jarName) {
    +    drillFuncRegistry.unregister(jarName);
    +  }
    +
    +  /**
    +   * Loads all missing functions from remote registry.
    +   * Compares list of already registered jars and remote jars, loads 
missing jars.
    +   * Missing jars are stores in local DRILL_UDF_DIR.
    +   *
    +   * @return true if at least functions from one jar were loaded
    +   */
    +  public boolean loadRemoteFunctions() {
    +    List<String> missingJars = Lists.newArrayList();
    +    Registry registry = remoteFunctionRegistry.getRegistry();
    +
    +    List<String> localJars = drillFuncRegistry.getAllJarNames();
    +    for (Jar jar : registry.getJarList()) {
    +      if (!localJars.contains(jar.getName())) {
    +        missingJars.add(jar.getName());
    +      }
    +    }
    +
    +    for (String jarName : missingJars) {
    +      try {
    +        Path localUdfArea = new Path(new File(getUdfDir()).toURI());
    --- End diff --
    
    Agree, I have already removed creation from sh script to Drill.


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