30 lines
1.2 KiB
Markdown
30 lines
1.2 KiB
Markdown
|
---
|
||
|
layout: global
|
||
|
title: Nan Semantics
|
||
|
displayTitle: NaN Semantics
|
||
|
license: |
|
||
|
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.
|
||
|
---
|
||
|
|
||
|
There is specially handling for not-a-number (NaN) when dealing with `float` or `double` types that
|
||
|
does not exactly match standard floating point semantics.
|
||
|
Specifically:
|
||
|
|
||
|
- NaN = NaN returns true.
|
||
|
- In aggregations, all NaN values are grouped together.
|
||
|
- NaN is treated as a normal value in join keys.
|
||
|
- NaN values go last when in ascending order, larger than any other numeric value.
|