[GitHub] [ignite-3] AMashenkov commented on a diff in pull request #2199: IGNITE-19726: Sql. Migrate index operations to ScannableTable.

["AMashenkov (via GitHub)" <gi...@apache.org>]

AMashenkov commented on code in PR #2199:
URL: https://github.com/apache/ignite-3/pull/2199#discussion_r1236694204


##########
modules/sql-engine/src/main/java/org/apache/ignite/internal/sql/engine/exec/TransformingPublisher.java:
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@@ -0,0 +1,64 @@
+/*
+ * 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.ignite.internal.sql.engine.exec;
+
+import java.util.concurrent.Flow.Publisher;
+import java.util.concurrent.Flow.Subscriber;
+import java.util.concurrent.Flow.Subscription;
+import java.util.function.Function;
+
+/**
+ * Publisher that converts items of type {@code T} to {@code type R}.
+ */
+final class TransformingPublisher<T, R> implements Publisher<R> {

Review Comment:
   Let's move this to ignite-core module package `org.apache.ignite.internal.util.subscription`



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