fsk119 commented on code in PR #26553: URL: https://github.com/apache/flink/pull/26553#discussion_r2095240475
########## flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/functions/sql/ml/SqlMlPredictTableFunction.java: ########## @@ -0,0 +1,116 @@ +/* + * 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.planner.functions.sql.ml; + +import org.apache.calcite.rel.type.RelDataType; +import org.apache.calcite.rel.type.RelDataTypeFactory; +import org.apache.calcite.sql.SqlCallBinding; +import org.apache.calcite.sql.SqlOperandCountRange; +import org.apache.calcite.sql.SqlOperator; +import org.apache.calcite.sql.SqlOperatorBinding; +import org.apache.calcite.sql.type.SqlOperandCountRanges; +import org.apache.calcite.sql.type.SqlOperandMetadata; +import org.apache.calcite.sql.type.SqlTypeName; + +import java.util.Collections; +import java.util.List; + +/** + * SqlMlPredictTableFunction implements an operator for prediction. + * + * <p>It allows four parameters: + * + * <ol> + * <li>a table + * <li>a model name + * <li>a descriptor to provide a column name from the input table + * <li>an optional config map + * </ol> + */ +public class SqlMlPredictTableFunction extends SqlMlTableFunction { + + public SqlMlPredictTableFunction() { + super("ML_PREDICT", new PredictOperandMetadata()); + } + + /** + * {@inheritDoc} + * + * <p>Overrides because the first parameter of table-value function windowing is an explicit + * TABLE parameter, which is not scalar. + */ + @Override + public boolean argumentMustBeScalar(int ordinal) { + return ordinal != 0; + } + + @Override + protected RelDataType inferRowType(SqlOperatorBinding opBinding) { + // TODO: FLINK-37780 output type based on table schema and model output schema + // model output schema to be available after integrated with SqlExplicitModelCall + return opBinding.getOperandType(1); Review Comment: I think the output schema of the ML_PREDICT combines input table schema and the model output schema. For example, if the input table schema is <a INT, b INT> and the model output schema is <c INT>, then the output schema of the ML_PREDICT is <a INT, b INT, c INT>. But the current implementation only takes model output schema into the consideration. -- 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: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
