[GitHub] [drill] jnturton commented on a change in pull request #2496: DRILL-8169: Add UDFs to HTTP Plugin to Facilitate Joins

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jnturton commented on a change in pull request #2496:
URL: https://github.com/apache/drill/pull/2496#discussion_r828820399



##########
File path: contrib/storage-http/src/main/java/org/apache/drill/exec/store/http/udfs/HttpHelperFunctions.java
##########
@@ -0,0 +1,166 @@
+/*
+ * 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.http.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.server.DrillbitContext;
+import org.apache.drill.exec.server.options.OptionManager;
+import org.apache.drill.exec.vector.complex.reader.FieldReader;
+import org.apache.drill.exec.vector.complex.writer.BaseWriter.ComplexWriter;
+
+import javax.inject.Inject;
+
+public class HttpHelperFunctions {
+
+  @FunctionTemplate(names = {"http_get_url", "httpGetUrl"},
+    scope = FunctionTemplate.FunctionScope.SIMPLE,
+    isVarArg = true)
+  public static class HttpGetFunction implements DrillSimpleFunc {
+
+    @Param
+    FieldReader[] inputReaders;
+
+    @Output
+    ComplexWriter writer;
+
+    @Inject
+    OptionManager options;
+
+    @Inject
+    DrillBuf buffer;
+
+    @Workspace
+    org.apache.drill.exec.vector.complex.fn.JsonReader jsonReader;
+
+    @Override
+    public void setup() {
+      jsonReader = new org.apache.drill.exec.vector.complex.fn.JsonReader.Builder(buffer)
+        .defaultSchemaPathColumns()
+        .readNumbersAsDouble(options.getOption(org.apache.drill.exec.ExecConstants.JSON_READ_NUMBERS_AS_DOUBLE).bool_val)
+        .allTextMode(options.getOption(org.apache.drill.exec.ExecConstants.JSON_ALL_TEXT_MODE).bool_val)
+        .enableNanInf(options.getOption(org.apache.drill.exec.ExecConstants.JSON_READER_NAN_INF_NUMBERS).bool_val)
+        .build();
+    }
+
+    @Override
+    public void eval() {
+      if (inputReaders.length > 0) {
+        // Get the URL
+        FieldReader urlReader = inputReaders[0];
+        String url = urlReader.readObject().toString();
+
+        // Process Positional Arguments
+        java.util.List args = org.apache.drill.exec.store.http.udfs.HttpHelperUtils.buildParameterList(inputReaders);
+        String finalUrl = org.apache.drill.exec.util.HttpUtils.mapPositionalParameters(url, args);
+
+        // Make the API call
+        String results = org.apache.drill.exec.util.HttpUtils.makeSimpleGetRequest(finalUrl);
+
+        // If the result string is null or empty, return an empty map
+        if (results == null || results.length() == 0) {
+          // Return empty map
+          org.apache.drill.exec.vector.complex.writer.BaseWriter.MapWriter mapWriter = writer.rootAsMap();
+          mapWriter.start();
+          mapWriter.end();
+          return;
+        }
+
+        try {
+          jsonReader.setSource(results);
+          jsonReader.setIgnoreJSONParseErrors(true);  // Reduce number of errors
+          jsonReader.write(writer);
+          buffer = jsonReader.getWorkBuf();
+        } catch (Exception e) {
+          throw new org.apache.drill.common.exceptions.DrillRuntimeException("Error while converting from JSON. ", e);
+        }
+      }
+    }
+  }
+
+
+  @FunctionTemplate(names = {"http_get", "httpGet"},

Review comment:
       If this UDF is not only for for GET requests, but for whatever request type is configured in the named storage config then can we name it differently?  `http_req_storage` or something?

##########
File path: exec/java-exec/src/main/java/org/apache/drill/exec/util/HttpUtils.java
##########
@@ -0,0 +1,168 @@
+/*
+ * 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.util;

Review comment:
       This class looks like it belongs in contrib/storage-http.  Is there a reason why it's here?




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