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https://issues.apache.org/jira/browse/DRILL-7458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17021360#comment-17021360
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ASF GitHub Bot commented on DRILL-7458:
---------------------------------------

vvysotskyi commented on pull request #1914: DRILL-7458: Base framework for 
storage plugins
URL: https://github.com/apache/drill/pull/1914#discussion_r369720302
 
 

 ##########
 File path: 
exec/java-exec/src/test/java/org/apache/drill/exec/store/base/TestFilterPushDown.java
 ##########
 @@ -0,0 +1,264 @@
+/*
+ * 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.base;
+
+import org.apache.drill.test.ClusterFixtureBuilder;
+import org.apache.drill.test.ClusterTest;
+import org.junit.BeforeClass;
+import org.junit.Ignore;
+import org.junit.Test;
+
+/**
+ * Tests for the Filter push-down helper classes as part of the
+ * "Base" storage plugin to be used for add-on plugins. Uses a
+ * "test mule" ("Dummy") plug-in which goes through the paces of
+ * planning push down, but then glosses over the details at run time.
+ * The focus here are plans: the tests plan a query then compare the
+ * actual plan against and expected ("golden") plan.
+ */
+public class TestFilterPushDown extends ClusterTest {
+
+  private static final String BASE_SQL = "SELECT a, b FROM dummy.myTable";
+  private static final String BASE_WHERE = BASE_SQL +  " WHERE ";
+  private static final PlanVerifier verifier = new 
PlanVerifier("/store/base/");
+
+  // Uncomment the next line to save failing plans to /tmp
+  // static { verifier.saveResults = true; }
+
+  @BeforeClass
+  public static void setup() throws Exception {
+    ClusterFixtureBuilder builder = new ClusterFixtureBuilder(dirTestWatcher);
+    startCluster(builder);
+
+    DummyStoragePluginConfig config =
+        new DummyStoragePluginConfig(true, true, false);
+    cluster.defineStoragePlugin("dummy", config);
+  }
+
+  //-------------------------------------------------
+  // Unsupported filter push-down cases
+
+  // No predicates
+
+  @Test
+  public void testNoPushDown() throws Exception
+  {
 
 Review comment:
   Please move brace to the same line
 
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> Base storage plugin framework
> -----------------------------
>
>                 Key: DRILL-7458
>                 URL: https://issues.apache.org/jira/browse/DRILL-7458
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Major
>              Labels: doc-impacting
>             Fix For: 1.18.0
>
>
> The "Easy" framework allows third-parties to add format plugins to Drill with 
> moderate effort. (The process could be easier, but "Easy" makes it as simple 
> as possible given the current structure.)
> At present, no such "starter" framework exists for storage plugins. Further, 
> multiple storage plugins have implemented filter push down, seemingly by 
> copying large blocks of code.
> This ticket offers a "base" framework for storage plugins and for filter 
> push-downs. The framework builds on the EVF, allowing plugins to also support 
> project push down.
> The framework has a "test mule" storage plugin to verify functionality, and 
> was used as the basis of an REST-like plugin.



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