kkhatua commented on a change in pull request #1491: DRILL-6084: Show Drill 
functions in WebUI for autocomplete
URL: https://github.com/apache/drill/pull/1491#discussion_r224943081
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/server/rest/WebServer.java
 ##########
 @@ -495,4 +509,50 @@ private void generateOptionsDescriptionJSFile() throws 
IOException {
       writer.flush();
     }
   }
+
+  //Generates ACE library javascript populated with list of available SQL 
functions
+  private void generateFunctionJS() throws IOException {
+    //Naturally ordered set of function names
+    TreeSet<String> functionSet = new TreeSet<>();
+    //Extracting ONLY builtIn functions (i.e those already available)
+    List<FunctionHolder> builtInFuncHolderList = 
this.drillbit.getContext().getFunctionImplementationRegistry().getLocalFunctionRegistry()
+        .getAllJarsWithFunctionsHolders().get(LocalFunctionRegistry.BUILT_IN);
+
+    //Build List of usable functions
+    int skipCount = 0;
+    for (FunctionHolder builtInFunctionHolder : builtInFuncHolderList) {
+      String name = builtInFunctionHolder.getName();
+      if (!name.contains(" ") && name.matches("([a-z]|[A-Z])\\w+")) {
+        functionSet.add(name);
+      } else {
+        logger.debug("Non-alphabetic leading character. Function skipped : {} 
", name);
+        skipCount++;
+      }
+    }
+    logger.debug("{} functions will not be available in WebUI : {} ", 
skipCount);
 
 Review comment:
   😇  fixed it

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