30 lines
1.2 KiB
Markdown
30 lines
1.2 KiB
Markdown
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---
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layout: global
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title: Nan Semantics
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displayTitle: NaN Semantics
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license: |
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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---
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There is specially handling for not-a-number (NaN) when dealing with `float` or `double` types that
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does not exactly match standard floating point semantics.
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Specifically:
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- NaN = NaN returns true.
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- In aggregations, all NaN values are grouped together.
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- NaN is treated as a normal value in join keys.
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- NaN values go last when in ascending order, larger than any other numeric value.
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