lowka commented on code in PR #5690:
URL: https://github.com/apache/ignite-3/pull/5690#discussion_r2071583828


##########
modules/sql-engine/src/test/java/org/apache/ignite/internal/sql/engine/planner/datatypes/utils/DatetimePair.java:
##########
@@ -0,0 +1,140 @@
+/*
+ * 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.planner.datatypes.utils;
+
+import org.apache.ignite.internal.type.NativeType;
+
+/**
+ * Enumerates possible datetime type pairs for test purposes.
+ */
+public enum DatetimePair implements TypePair {
+    DATE_DATE(Types.DATE, Types.DATE),
+
+    TIME_0_TIME_0(Types.TIME_0, Types.TIME_0),
+    TIME_0_TIME_3(Types.TIME_0, Types.TIME_3),
+    TIME_0_TIME_6(Types.TIME_0, Types.TIME_6),
+    TIME_0_TIME_9(Types.TIME_0, Types.TIME_9),
+
+    TIME_3_TIME_0(Types.TIME_3, Types.TIME_0),

Review Comment:
   > all type pairs introduced so far describe unique-disregard-the-order pairs 
(i.e. there is TINYINT_SMALLINT but not SMALLINT_TINYINT). 
   
   Could you please rephrase that or provide an example? Do you mean this the 
following?
   ```
   TIME_0_TIME_0 
   TIME_0_TIME_3
   TIME_0_TIME_6 
   TIME_0_TIME_9
   ...
   TIME_3_TIME_3
   TIME_3_TIME_6
   TIME_3_TIME_9
   ..
   TIME_9_TIME_?
   ```
   



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