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ASF GitHub Bot commented on FLINK-6960: --------------------------------------- Github user sunjincheng121 commented on a diff in the pull request: https://github.com/apache/flink/pull/4152#discussion_r123261877 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/scalarSqlFunctions/MathSqlFunctions.scala --- @@ -0,0 +1,35 @@ +/* + * 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.functions.scalarSqlFunctions + +import org.apache.calcite.sql.{SqlFunction, SqlFunctionCategory, SqlKind} +import org.apache.calcite.sql.`type`._ + +class MathSqlFunctions { + +} + +object MathSqlFunctions { + val E = new SqlFunction( --- End diff -- I notice this class, I have not using this because: 1. The constructor of `SqlBaseContextVariable` is protected. 2. I think called the scalar function with "()" is make sense. About the folder, at the point of my view, Build-in scalar function in flink will need two part: 1. `SqlFuncitons` which are define the interface of scalar function for `FunctionGenerator` and `FunctionCatalog`. 2. `Runtime implementation` which are the real logic of scalar function. using in `BuiltInMethods`. So, I want create two packages: `org.apache.flink.table.functions.scalarSqlFunctions` and `org.apache.flink.table.runtime.scalarfunctions`(in this PR not need the runtime package). Please let me know What do you think? > Add E(2.7182818284590452354),PI(3.14159265358979323846) supported in SQL > ------------------------------------------------------------------------ > > Key: FLINK-6960 > URL: https://issues.apache.org/jira/browse/FLINK-6960 > Project: Flink > Issue Type: Sub-task > Components: Table API & SQL > Reporter: sunjincheng > Assignee: sunjincheng > Labels: starter > > E=Math.E > PI=Math.PI -- This message was sent by Atlassian JIRA (v6.4.14#64029)