spark-instrumented-optimizer/docs/sql-ref.md at 5e0cb3ee16dde3666af3bf5f2b152c7d0dfe9d7b

gatorsmile d06604f60a [SPARK-32078][DOC] Add a redirect to sql-ref from sql-reference

### What changes were proposed in this pull request?
This PR is to add a redirect to sql-ref.html.

### Why are the changes needed?
Before Spark 3.0 release, we are using sql-reference.md, which was replaced by sql-ref.md instead. A number of Google searches I’ve done today have turned up https://spark.apache.org/docs/latest/sql-reference.html, which does not exist any more. Thus, we should add a redirect to sql-ref.html.

### Does this PR introduce _any_ user-facing change?

https://spark.apache.org/docs/latest/sql-reference.html will be redirected to https://spark.apache.org/docs/latest/sql-ref.html

### How was this patch tested?

Build it in my local environment. It works well. The sql-reference.html file was generated. The contents are like:

```
<!DOCTYPE html>
<html lang="en-US">
  <meta charset="utf-8">
  <title>Redirecting&hellip;</title>
  <link rel="canonical" href="http://localhost:4000/sql-ref.html">
  <script>location="http://localhost:4000/sql-ref.html"</script>
  <meta http-equiv="refresh" content="0; url=http://localhost:4000/sql-ref.html">
  <meta name="robots" content="noindex">
  <h1>Redirecting&hellip;</h1>
  <a href="http://localhost:4000/sql-ref.html">Click here if you are not redirected.</a>
</html>
```

Closes #28914 from gatorsmile/addRedirectSQLRef.

Authored-by: gatorsmile <gatorsmile@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

2020-06-24 11:00:20 -07:00

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layout	title	redirect_from	displayTitle	license
global	SQL Reference	/sql-reference	SQL Reference	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.

Spark SQL is Apache Spark's module for working with structured data. This guide is a reference for Structured Query Language (SQL) and includes syntax, semantics, keywords, and examples for common SQL usage. It contains information for the following topics:

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