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https://issues.apache.org/jira/browse/TAJO-1383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14357975#comment-14357975
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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_r26273284
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/planner/physical/ScanExec.java
---
@@ -0,0 +1,70 @@
+/**
+ * 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.planner.physical;
+
+import org.apache.tajo.catalog.Schema;
+import org.apache.tajo.catalog.proto.CatalogProtos;
+import org.apache.tajo.engine.planner.enforce.Enforcer;
+import org.apache.tajo.ipc.TajoWorkerProtocol;
+import org.apache.tajo.worker.TaskAttemptContext;
+
+import java.io.IOException;
+import java.util.List;
+
+public abstract class ScanExec extends PhysicalExec {
+ private boolean canBroadcast;
--- End diff --
Would you add some descriptions on this variable?
It makes me confusing.
Does it mean this scan is broadcasted or is a broadcast candidate?
> 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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