Converting HashJoinBasicTest to ESIntegTestCase (#74)

*Issue:* #17 

*How tested:* ./gradlew build

src/test/java/com/amazon/opendistroforelasticsearch/sql/esintgtest/HashJoinBasicIT.java

@@ -0,0 +1,98 @@
+/*
+ *   Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License").
+ *   You may not use this file except in compliance with the License.
+ *   A copy of the License is located at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   or in the "license" file accompanying this file. This file 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 com.amazon.opendistroforelasticsearch.sql.esintgtest;
+
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Set;
+
+import static com.amazon.opendistroforelasticsearch.sql.esintgtest.TestsConstants.TEST_INDEX_ACCOUNT;
+import static org.hamcrest.Matchers.equalTo;
+
+/**
+ * Test new hash join algorithm by comparison with old implementation.
+ */
+public class HashJoinBasicIT extends SQLIntegTestCase {
+
+    /**
+     * Hint to use old join algorithm
+     */
+    private static final String USE_OLD_JOIN_ALGORITHM = "/*! USE_NL*/";
+
+    /**
+     * Set limit to 100% to bypass circuit break check
+     */
+    private static final String BYPASS_CIRCUIT_BREAK = "/*! JOIN_CIRCUIT_BREAK_LIMIT(100)*/";
+
+    @Override
+    protected void init() throws Exception {
+        loadIndex(Index.ACCOUNT);
+    }
+
+    @Test
+    public void innerJoin() throws IOException {
+
+        testJoin("INNER JOIN");
+    }
+
+    @Test
+    public void leftJoin() throws IOException {
+
+        testJoin("LEFT JOIN");
+    }
+
+    public void testJoin(final String join) throws IOException {
+
+        final String queryPrefix = "SELECT";
+
+        // TODO: reduce the balance threshold to 10000 when the memory circuit breaker issue
+        //  (https://github.com/opendistro-for-elasticsearch/sql/issues/73) is fixed.
+        final String querySuffixTemplate = "a.firstname, a.lastname, b.city, b.state FROM %1$s a %2$s %1$s b " +
+                "ON b.age = a.age WHERE a.balance > 45000 AND b.age > 25 LIMIT 1000000";
+        final String querySuffix = String.format(Locale.ROOT, querySuffixTemplate, TEST_INDEX_ACCOUNT, join);
+
+        final String oldQuery = String.join(" ", queryPrefix, USE_OLD_JOIN_ALGORITHM, querySuffix);
+        final String newQuery = String.join(" ", queryPrefix, BYPASS_CIRCUIT_BREAK, querySuffix);
+
+        final JSONObject responseOld = executeQuery(oldQuery);
+        final JSONObject responseNew = executeQuery(newQuery);
+
+        Assert.assertThat(getTotalHits(responseOld), equalTo(getTotalHits(responseNew)));
+
+        final JSONArray hitsOld = getHits(responseOld);
+        final JSONArray hitsNew = getHits(responseNew);
+
+        Assert.assertThat(hitsOld.length(), equalTo(hitsNew.length()));
+
+        Set<String> idsOld = new HashSet<>();
+
+        hitsOld.forEach(hitObj -> {
+            JSONObject hit = (JSONObject) hitObj;
+            idsOld.add(hit.getString("_id"));
+        });
+
+        hitsNew.forEach(hitObj -> {
+            JSONObject hit = (JSONObject) hitObj;
+            Assert.assertTrue(idsOld.contains(hit.getString("_id")));
+        });
+    }
+}

src/test/java/com/amazon/opendistroforelasticsearch/sql/intgtest/MainTestSuite.java

@@ -67,7 +67,6 @@
 @Suite.SuiteClasses({
     QueryTest.class,
     AggregationTest.class,
-    HashJoinBasicTest.class,
     HashJoinMoreTest.class,
     CSVResultsExtractorTests.class,
     MultiQueryTests.class,