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https://issues.apache.org/jira/browse/FLINK-10474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16647960#comment-16647960
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ASF GitHub Bot commented on FLINK-10474:
----------------------------------------
fhueske commented on a change in pull request #6792: [FLINK-10474][table] Don't
translate IN/NOT_IN to JOIN with VALUES
URL: https://github.com/apache/flink/pull/6792#discussion_r224801724
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/rules/common/ConvertToNotInOrInRule.scala
##########
@@ -0,0 +1,179 @@
+/*
+ * 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.flink.table.plan.rules.common
+
+import org.apache.calcite.plan.RelOptRule.{any, operand}
+import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall, 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.{IN, NOT_IN, EQUALS,
NOT_EQUALS, AND, OR}
+import org.apache.calcite.tools.RelBuilder
+
+import scala.collection.JavaConversions._
+import scala.collection.mutable
+
+/**
+ * Rule for converting a cascade of predicates to [[IN]] or [[NOT_IN]].
+ *
+ * For example, convert predicate: (x = 1 OR x = 2 OR x = 3) AND y = 4 to
+ * predicate: x IN (1, 2, 3) AND y = 4.
+ *
+ * @param fromOperator The fromOperator, for example, when convert to
[[IN]], fromOperator is
+ * [[EQUALS]]. We convert a cascade of [[EQUALS]] to
[[IN]].
+ * @param connectOperator The connect operator to connect the fromOperator.
+ * @param composedOperator The composed operator that may contains sub [[IN]]
or [[NOT_IN]].
+ * @param toOperator The toOperator, for example, when convert to
[[IN]], toOperator is
+ * [[IN]]. We convert a cascade of [[EQUALS]] to
[[IN]].
+ * @param description The description of the rule.
+ */
+class ConvertToNotInOrInRule(
+ fromOperator: SqlBinaryOperator,
Review comment:
Only pass the `toOperator` parameter and set all other parameters
appropriately?
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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 & 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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