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https://issues.apache.org/jira/browse/DRILL-8169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17508880#comment-17508880
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ASF GitHub Bot commented on DRILL-8169:
---------------------------------------
cgivre commented on a change in pull request #2496:
URL: https://github.com/apache/drill/pull/2496#discussion_r830124255
##########
File path:
contrib/storage-http/src/main/java/org/apache/drill/exec/store/http/udfs/HttpHelperFunctions.java
##########
@@ -0,0 +1,167 @@
+/*
+ * 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.expr.holders.VarCharHolder;
+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", "httpGet"},
+ scope = FunctionTemplate.FunctionScope.SIMPLE,
+ isVarArg = true)
+ public static class HttpGetFunction implements DrillSimpleFunc {
+
+ @Param
+ VarCharHolder rawInput;
+
+ @Param
+ FieldReader[] inputReaders;
Review comment:
Thanks @vvysotskyi. I changed to `VarCharHolder[]` for both functions.
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> Add UDFs to HTTP Plugin to Facilitate Joins
> -------------------------------------------
>
> Key: DRILL-8169
> URL: https://issues.apache.org/jira/browse/DRILL-8169
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Other
> Affects Versions: 1.20.0
> Reporter: Charles Givre
> Assignee: Charles Givre
> Priority: Major
> Fix For: 2.0.0
>
>
> There are some situations where a user might want to join data with an API
> result and the pushdowns prevent that from happening. The main situation
> where this happens is when
> an API has parameters which are part of the URL AND these parameters are
> dynamically populated via a join.
> In this case, there are two functions `http_get_url` and `http_get` which you
> can use to faciliate these joins.
> * `http_get('<storage_plugin_name>', <params>)`: This function accepts a
> storage plugin as input and an optional list of parameters to include in a
> URL.
> * `http_get_url(<url>, <params>)`: This function works in the same way except
> that it does not pull any configuration information from existing storage
> plugins.
> ### Example Queries
> Let's say that you have a storage plugin called `github` with an endpoint
> called `repos` which points to the url: https://github.com/orgs/\{org}/repos.
> It is easy enough to
> write a query like this:
> ```sql
> SELECT *
> FROM github.repos
> WHERE org='apache'
> ```
> However, if you had a file with organizations and wanted to join this with
> the API, the query would fail. Using the functions listed above you could get
> this data as follows:
> ```sql
> SELECT http_get('github.repos', `org`)
> FROM dfs.`some_data.csvh`
> ```
> or
> ```sql
> SELECT http_get('https://github.com/orgs/\{org}/repos', `org`)
> FROM dfs.`some_data.csvh`
> ```
> ** WARNING: This functionality will execute an HTTP Request FOR EVERY ROW IN
> YOUR DATA. Use with caution. **
>
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