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https://issues.apache.org/jira/browse/TAJO-1383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14357984#comment-14357984
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ASF GitHub Bot commented on TAJO-1383:
--------------------------------------
Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/404#discussion_r26273518
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/utils/TableCache.java ---
@@ -0,0 +1,81 @@
+/**
+ * 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.tajo.engine.utils;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.tajo.ExecutionBlockId;
+
+import java.util.List;
+import java.util.Map;
+
+public class TableCache {
--- End diff --
Would you add some descriptions on this class?
> Improve broadcast table cache
> -----------------------------
>
> Key: TAJO-1383
> URL: https://issues.apache.org/jira/browse/TAJO-1383
> Project: Tajo
> Issue Type: Improvement
> Components: physical operator
> Affects Versions: 0.8.0, 0.9.0, 0.10
> Reporter: Jinho Kim
> Assignee: Jinho Kim
> Labels: performance
> Attachments: TAJO-1383.patch
>
>
> Currently, broadcast implementation keep a tuples on scan operator and It
> create a duplicated table cache in memory.
> We should improve it
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