[ 
https://issues.apache.org/jira/browse/DRILL-7343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16908175#comment-16908175
 ] 

ASF GitHub Bot commented on DRILL-7343:
---------------------------------------

arina-ielchiieva commented on pull request #1840: DRILL-7343: Add User-Agent 
UDFs to Drill
URL: https://github.com/apache/drill/pull/1840#discussion_r314356145
 
 

 ##########
 File path: 
contrib/udfs/src/main/java/org/apache/drill/exec/udfs/UserAgentFunctions.java
 ##########
 @@ -0,0 +1,126 @@
+/*
+ * 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.udfs;
+
+import io.netty.buffer.DrillBuf;
+import org.apache.drill.exec.expr.DrillSimpleFunc;
+import org.apache.drill.exec.expr.annotations.FunctionTemplate;
+import org.apache.drill.exec.expr.annotations.Output;
+import org.apache.drill.exec.expr.annotations.Param;
+import org.apache.drill.exec.expr.annotations.Workspace;
+import org.apache.drill.exec.expr.holders.VarCharHolder;
+import org.apache.drill.exec.vector.complex.writer.BaseWriter;
+
+import javax.inject.Inject;
+
+public class UserAgentFunctions {
+
+  @FunctionTemplate(name = "parse_user_agent", scope = 
FunctionTemplate.FunctionScope.SIMPLE)
+
+  public static class UserAgentFunction implements DrillSimpleFunc {
+    @Param
+    VarCharHolder input;
+
+    @Output
+    BaseWriter.ComplexWriter outWriter;
+
+    @Inject
+    DrillBuf outBuffer;
+
+    @Workspace
+    nl.basjes.parse.useragent.UserAgentAnalyzerDirect uaa;
+
+    public void setup() {
+      uaa = 
nl.basjes.parse.useragent.UserAgentAnalyzerDirect.newBuilder().dropTests().hideMatcherLoadStats().build();
+      uaa.getAllPossibleFieldNamesSorted();
+    }
+
+    public void eval() {
+      org.apache.drill.exec.vector.complex.writer.BaseWriter.MapWriter 
queryMapWriter = outWriter.rootAsMap();
+
+      String userAgentString = 
org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.getStringFromVarCharHolder(input);
+
+      if (userAgentString.isEmpty() || userAgentString.equals("null")) {
+        userAgentString = "";
+      }
+
+      nl.basjes.parse.useragent.UserAgent agent = uaa.parse(userAgentString);
+
+      for (String fieldName : agent.getAvailableFieldNamesSorted()) {
+
+        org.apache.drill.exec.expr.holders.VarCharHolder rowHolder = new 
org.apache.drill.exec.expr.holders.VarCharHolder();
+        String field = agent.getValue(fieldName);
+
+        byte[] rowStringBytes = field.getBytes();
+        outBuffer.reallocIfNeeded(rowStringBytes.length);
+        outBuffer.setBytes(0, rowStringBytes);
+
+        rowHolder.start = 0;
+        rowHolder.end = rowStringBytes.length;
+        rowHolder.buffer = outBuffer;
+
+        queryMapWriter.varChar(fieldName).write(rowHolder);
+      }
+    }
+  }
+
+  @FunctionTemplate(name = "parse_user_agent", scope = 
FunctionTemplate.FunctionScope.SIMPLE)
+
+  public static class UserAgentFieldFunction implements DrillSimpleFunc {
+    @Param
+    VarCharHolder input;
+
+    @Param
+    VarCharHolder desiredField;
+
+    @Output
+    VarCharHolder out;
+
+    @Inject
+    DrillBuf outBuffer;
+
+    @Workspace
+    nl.basjes.parse.useragent.UserAgentAnalyzerDirect uaa;
+
+    public void setup() {
+      uaa = 
nl.basjes.parse.useragent.UserAgentAnalyzerDirect.newBuilder().dropTests().hideMatcherLoadStats().build();
+      uaa.getAllPossibleFieldNamesSorted();
+    }
+
+    public void eval() {
+      String userAgentString = 
org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.getStringFromVarCharHolder(input);
+      String requestedField = 
org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.getStringFromVarCharHolder(desiredField);
+
+      if (userAgentString.isEmpty() || userAgentString.equals("null")) {
+        userAgentString = "";
+      }
+
+      nl.basjes.parse.useragent.UserAgent agent = uaa.parse(userAgentString);
+      String field = agent.getValue(requestedField);
 
 Review comment:
   What behavior if requested field is absent? It returns `Unknown`?
 
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> Add User-Agent UDFs to Drill
> ----------------------------
>
>                 Key: DRILL-7343
>                 URL: https://issues.apache.org/jira/browse/DRILL-7343
>             Project: Apache Drill
>          Issue Type: New Feature
>    Affects Versions: 1.17.0
>            Reporter: Charles Givre
>            Assignee: Charles Givre
>            Priority: Major
>             Fix For: 1.17.0
>
>
> This collection of UDFs adds the ability to parse user agent strings which is 
> useful for security data analysis. 



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