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## What changes were proposed in this pull request? This is a initial PR that creates the table of content for SQL reference guide. The left side bar will displays additional menu items corresponding to supported SQL constructs. One this PR is merged, we will fill in the content incrementally. Additionally this PR contains a minor change to make the left sidebar scrollable. Currently it is not possible to scroll in the left hand side window. ## How was this patch tested? Used jekyll build and serve to verify. Closes #25459 from dilipbiswal/ref-doc. Authored-by: Dilip Biswal <dbiswal@us.ibm.com> Signed-off-by: gatorsmile <gatorsmile@gmail.com>
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| layout | title | displayTitle | license |
|---|---|---|---|
| global | Nan Semantics | NaN Semantics | 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.