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https://issues.apache.org/jira/browse/BEAM-3171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16274745#comment-16274745
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ASF GitHub Bot commented on BEAM-3171:
--------------------------------------
XuMingmin commented on a change in pull request #4196: [BEAM-3171] convert a
join into lookup
URL: https://github.com/apache/beam/pull/4196#discussion_r154413322
##########
File path:
sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/BeamSqlSeekableTable.java
##########
@@ -0,0 +1,35 @@
+/*
+ * 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.beam.sdk.extensions.sql;
+
+import java.io.Serializable;
+import java.util.List;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.values.BeamRecord;
+
+/**
+ * A seekable table converts a JOIN operator to an inline lookup.
+ * It's triggered by {@code SELECT * FROM FACT_TABLE JOIN LOOKUP_TABLE ON ...}.
+ */
+@Experimental
+public interface BeamSqlSeekableTable extends Serializable{
Review comment:
1. Yes, I'll add it to the surface test;
2. Intent to keep it as a separated interface, so users can leverage it to
convert a provided BeamTable to seekable when required; (For example I have an
extended seekable BeamTextCSVTable to lookup from daily changed files)
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> convert a join into lookup
> --------------------------
>
> Key: BEAM-3171
> URL: https://issues.apache.org/jira/browse/BEAM-3171
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql
> Reporter: Xu Mingmin
> Assignee: Xu Mingmin
> Labels: experimental
>
> We use BeamSQL to run streaming jobs mostly, and add a join_as_lookup
> improvement(internal branch) to cover the streaming-to-batch case(similar as
> [1]). I could submit a PR as experimental if people are interested.
> The rough solution is, if one source of join node implements
> {{BeamSeekableTable}} and the other is not, then the join node is converted
> to a fact-lookup operation.
> Ref:
> [1]
> https://docs.google.com/document/d/1B-XnUwXh64lbswRieckU0BxtygSV58hysqZbpZmk03A/edit?usp=sharing
>
> [~xumingming] [~takidau] for any comments
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