[
https://issues.apache.org/jira/browse/DRILL-4743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373518#comment-15373518
]
ASF GitHub Bot commented on DRILL-4743:
---------------------------------------
Github user gparai commented on a diff in the pull request:
https://github.com/apache/drill/pull/534#discussion_r70504733
--- Diff: exec/java-exec/src/test/java/org/apache/drill/TestOptions.java ---
@@ -0,0 +1,79 @@
+/**
+ * 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;
+
+import org.apache.drill.common.util.TestTools;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestOptions extends BaseTestQuery {
+ static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(TestOptions.class);
+
+ static final String WORKING_PATH = TestTools.getWorkingPath();
+ static final String TEST_RES_PATH = WORKING_PATH +
"/src/test/resources";
+ private static final String EXPLAIN_PREFIX = "EXPLAIN PLAN FOR ";
+ private static final String EXPLAIN_WITH_ATTRIB_PREFIX = "EXPLAIN PLAN
INCLUDING ATTRIBUTES FOR ";
--- End diff --
Removed.
> HashJoin's not fully parallelized in query plan
> -----------------------------------------------
>
> Key: DRILL-4743
> URL: https://issues.apache.org/jira/browse/DRILL-4743
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.5.0
> Reporter: Gautam Kumar Parai
> Assignee: Gautam Kumar Parai
> Labels: doc-impacting
>
> The underlying problem is filter selectivity under-estimate for a query with
> complicated predicates e.g. deeply nested and/or predicates. This leads to
> under parallelization of the major fragment doing the join.
> To really resolve this problem we need table/column statistics to correctly
> estimate the selectivity. However, in the absence of statistics OR even when
> existing statistics are insufficient to get a correct estimate of selectivity
> this will serve as a workaround.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
