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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-10474) Don't translate IN with Literals to JOIN with VALUES for streaming queries
Date Wed, 10 Oct 2018 09:15:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-10474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16644699#comment-16644699

ASF GitHub Bot commented on FLINK-10474:

fhueske commented on a change in pull request #6792: [FLINK-10474][table] Don't translate
URL: https://github.com/apache/flink/pull/6792#discussion_r223996770

 File path: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/common/ConvertToNotInOrInRule.scala
 @@ -0,0 +1,136 @@
+ * 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
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+ */
+package org.apache.flink.table.plan.rules.common
+import org.apache.calcite.plan.RelOptRule.{any, operand}
+import org.apache.calcite.plan.{RelOptRule, RelOptUtil}
+import org.apache.calcite.rel.core.Filter
+import org.apache.calcite.rex.{RexCall, RexLiteral, RexNode}
+import org.apache.calcite.sql.SqlBinaryOperator
+import org.apache.calcite.sql.fun.SqlStdOperatorTable._
+import org.apache.calcite.tools.RelBuilder
+import scala.collection.JavaConversions._
+import scala.collection.mutable
+  * Common convert rule for converting a cascade of predicates to IN or NOT_IN.
+  */
+abstract class ConvertToNotInOrInRule(description: String) extends RelOptRule(
 Review comment:
   If we make this a non-abstract class with constructor parameters for `fromOperator`, `connectOperator`,
etc. we can create static instances in this class, similar to the instance in `ReduceExpressionsRule`.
That would remove some of the shared boilerplate code in the child classes.

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> Don't translate IN with Literals to JOIN with VALUES for streaming queries
> --------------------------------------------------------------------------
>                 Key: FLINK-10474
>                 URL: https://issues.apache.org/jira/browse/FLINK-10474
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API &amp; SQL
>    Affects Versions: 1.6.1, 1.7.0
>            Reporter: Fabian Hueske
>            Assignee: Hequn Cheng
>            Priority: Major
>              Labels: pull-request-available
> IN predicates with literals are translated to JOIN with VALUES if the number of elements
in the IN clause exceeds a certain threshold. This should not be done, because a streaming
join is very heavy and materializes both inputs (which is fine for the VALUES) input but not
for the other.
> There are two ways to solve this:
>  # don't translate IN to a JOIN at all
>  # translate it to a JOIN but have a special join strategy if one input is bound and
final (non-updating)
> Option 1. should be easy to do, option 2. requires much more effort.

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