dennishuo commented on code in PR #4269:
URL: https://github.com/apache/polaris/pull/4269#discussion_r3243082105


##########
persistence/relational-jdbc/src/main/java/org/apache/polaris/persistence/relational/jdbc/idempotency/RelationalJdbcIdempotencyStore.java:
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@@ -1,250 +0,0 @@
-/*
- * 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.polaris.persistence.relational.jdbc.idempotency;
-
-import jakarta.annotation.Nonnull;
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.sql.Timestamp;
-import java.time.Instant;
-import java.util.HashMap;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.Set;
-import javax.sql.DataSource;
-import org.apache.polaris.core.entity.IdempotencyRecord;
-import org.apache.polaris.core.persistence.IdempotencyPersistenceException;
-import org.apache.polaris.core.persistence.IdempotencyStore;
-import org.apache.polaris.persistence.relational.jdbc.DatasourceOperations;
-import org.apache.polaris.persistence.relational.jdbc.QueryGenerator;
-import 
org.apache.polaris.persistence.relational.jdbc.RelationalJdbcConfiguration;
-import org.apache.polaris.persistence.relational.jdbc.models.Converter;
-import 
org.apache.polaris.persistence.relational.jdbc.models.ModelIdempotencyRecord;
-
-public class RelationalJdbcIdempotencyStore implements IdempotencyStore {

Review Comment:
   For easy discoverability/posterity, here's the link to the mailing list 
discussion that included discussion about the SPI: 
https://lists.apache.org/thread/nk49rfgbzt2nsvplny14wrp98occ61w4 (and 
specifically that's the link to my stance).
   
   The TL;DR of my stance was that I agree with wanting to keep 
`IdempotencyPersistence` split out of `BasePersistence`, and basically we can 
follow the pattern of how `IntegrationPersistence` was mixed in, still allowing 
expressing a concrete implementation that explicitly relies on transactions 
across the persistence interfaces -- today that's expressed via 
`TransactionalPersistence extends BasePersistence, IntegrationPersistence[, 
IdempotencyPersistence]`.
   
   Specifically, we wanted the ability for implementors to choose their 
cross-concern transactionality semantics.
   
   So, if they write a `MyBasicPersistenceOnDynamo implements BasePersistence` 
and YoloPersistenceAddonsOnRedis implements IntegrationPersistence, 
IdempotencyPersistence` that's still possible.
   
   On this line of code though it would mean we're allowing JDBC to have one 
conceptual *concrete implementation* which intentionally simultaneously 
implements the different persistences at once. I suppose we could always still 
refactor into different JdbcIdempotencyStoreImpl, JdbcIntegrationStoreImpl, 
etc., but that'd need to have some more complex wiring/shared-state nonetheless 
if the intent *for JDBC specifically* is indeed to say that we're intentionally 
putting them all in the same underlying store.



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