soin08 commented on code in PR #28142: URL: https://github.com/apache/flink/pull/28142#discussion_r3369914008
########## flink-libraries/flink-state-processing-api/src/main/java/org/apache/flink/state/api/filter/BoundComparison.java: ########## @@ -0,0 +1,62 @@ +/* + * 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.state.api.filter; + +import javax.annotation.Nullable; + +import java.io.Serializable; + +/** Comparison strategy resolved from the bound types at filter construction time. */ +enum BoundComparison implements Serializable { + LONG { + @Override + public int compare(Object a, Object b) { + return Long.compare(((Number) a).longValue(), ((Number) b).longValue()); + } + }, + DOUBLE { + @Override + public int compare(Object a, Object b) { + return Double.compare(((Number) a).doubleValue(), ((Number) b).doubleValue()); + } + }, + NATURAL { + @SuppressWarnings("unchecked") + @Override + public int compare(Object a, Object b) { + return ((Comparable<Object>) a).compareTo(b); + } + }; + + public abstract int compare(Object a, Object b); + + static BoundComparison resolve(@Nullable Object lower, @Nullable Object upper) { + if (isFloatingPoint(lower) || isFloatingPoint(upper)) { + return DOUBLE; + } + if (lower instanceof Number || upper instanceof Number) { + return LONG; + } + return NATURAL; + } Review Comment: After more testing I decided not to add a custom coercer for type widening — it would pull a lot of type-handling logic into what is a connector, not a table-planner module. One example: with a `SMALLINT` key and an `INT` literal, `WHERE k = 5` makes the planner wrap the key in `CAST(k AS INT)`. To push that down we'd have to teach `SavepointKeyFilter` to unwrap such casts and handle the whole widening matrix — too much for a best-effort optimization. Instead I rely on `literal.getValueAs(keyColumnType.getConversionClass())`: push down when the literal is already representable as the key type. The burden of casting correctly does fall on the user — they should match the literal type to the key type (e.g. `WHERE k = CAST(5 AS SMALLINT))` to get pushdown — which I think is a reasonable trade-off for keeping this connector simple. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
