[GitHub] arina-ielchiieva commented on a change in pull request #1483: DRILL-3988: Expose Drill built-in functions & UDFs in a system table

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arina-ielchiieva commented on a change in pull request #1483: DRILL-3988: Expose Drill built-in functions & UDFs  in a system table
URL: https://github.com/apache/drill/pull/1483#discussion_r222602309
 
 

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 File path: exec/java-exec/src/main/java/org/apache/drill/exec/store/sys/FunctionsIterator.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.store.sys;
+
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.drill.exec.expr.fn.DrillFuncHolder;
+import org.apache.drill.exec.expr.fn.FunctionImplementationRegistry;
+import org.apache.drill.exec.expr.fn.registry.FunctionHolder;
+import org.apache.drill.exec.expr.fn.registry.LocalFunctionRegistry;
+import org.apache.drill.exec.ops.ExecutorFragmentContext;
+import org.apache.drill.exec.store.pojo.NonNullable;
+
+/**
+ * List functions as a System Table
+ */
+public class FunctionsIterator implements Iterator<Object> {
+  //private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(FunctionsIterator.class);
+
+  private Iterator<FunctionInfo> sortedIterator;
+
+  public FunctionsIterator(ExecutorFragmentContext context) {
+    Map<String, FunctionInfo> functionMap = new HashMap<String, FunctionInfo>();
+    //Access Registry for function list
+    FunctionImplementationRegistry funcImplRegistry = (FunctionImplementationRegistry) context.getFunctionRegistry();
+    Map<String, List<FunctionHolder>>  jarFunctionListMap = funcImplRegistry.getAllFunctionsHoldersByJar();
+
+    //Step 1: Load Built-In
+    for (FunctionHolder builtInEntry : jarFunctionListMap.get(LocalFunctionRegistry.BUILT_IN)) {
+      populateFunctionMap(functionMap, LocalFunctionRegistry.BUILT_IN, builtInEntry.getHolder());
+    }
+    //Step 2: Load UDFs
+    for (String jarName : new ArrayList<>(jarFunctionListMap.keySet())) {
+      if (!jarName.equals(LocalFunctionRegistry.BUILT_IN)) {
+        for (FunctionHolder udfEntry : jarFunctionListMap.get(jarName)) {
+          populateFunctionMap(functionMap, jarName, udfEntry.getHolder());
+        }
+      }
+    }
+
+    List<FunctionInfo> functionList = new ArrayList<FunctionsIterator.FunctionInfo>(functionMap.values());
+    functionList.sort(new Comparator<FunctionInfo>() {
 
 Review comment:
   You can make comparator class level variable.

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