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https://issues.apache.org/jira/browse/FLINK-6891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060807#comment-16060807
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ASF GitHub Bot commented on FLINK-6891:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4122#discussion_r123734750
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/scalarSqlFunctions/MathSqlFunctions.scala
---
@@ -0,0 +1,32 @@
+/*
+ * 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
--- End diff --
I would move this to `org.apache.flink.table.functions.sql`. We usually
don't use upper cases in packages.
> Add LOG(X) supported in SQL
> ---------------------------
>
> Key: FLINK-6891
> URL: https://issues.apache.org/jira/browse/FLINK-6891
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: sunjincheng
> Assignee: sunjincheng
>
> LOG(X), LOG(B,X)
> If called with one parameter, this function returns the natural logarithm of
> X. If X is less than or equal to 0.0E0, the function returns NULL and (as of
> MySQL 5.7.4) a warning “Invalid argument for logarithm” is reported.
> The inverse of this function (when called with a single argument) is the
> EXP() function.
> If called with two parameters, this function returns the logarithm of X to
> the base B. If X is less than or equal to 0, or if B is less than or equal to
> 1, then NULL is returned.
> * Example:
> LOG(2) -> 0.69314718055995
> LOG(-2) -> NULL
> LOG(2,65536) -> 16
> LOG(10,100) -> 2
> LOG(1,100) -> NULL
> * See more:
> ** [MySQL|
> https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html#function_log]
> --NOTE-- In this JIRA. NULL case will throw IllegalArgumentException.
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