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spark-instrumented-optimizer/docs/sql-ref-syntax-aux-refresh-table.md
Yuanjian Li 01cc852982 [SPARK-30803][DOCS] Fix the home page link for Scala API document 
### What changes were proposed in this pull request?
Change the link to the Scala API document.

```
$ git grep "#org.apache.spark.package"
docs/_layouts/global.html:                                <li><a href="api/scala/index.html#org.apache.spark.package">Scala</a></li>
docs/index.md:* [Spark Scala API (Scaladoc)](api/scala/index.html#org.apache.spark.package)
docs/rdd-programming-guide.md:[Scala](api/scala/#org.apache.spark.package), [Java](api/java/), [Python](api/python/) and [R](api/R/).
```

### Why are the changes needed?
The home page link for Scala API document is incorrect after upgrade to 3.0

### Does this PR introduce any user-facing change?
Document UI change only.

### How was this patch tested?
Local test, attach screenshots below:
Before:
![image](https://user-images.githubusercontent.com/4833765/74335713-c2385300-4dd7-11ea-95d8-f5a3639d2578.png)
After:
![image](https://user-images.githubusercontent.com/4833765/74335727-cbc1bb00-4dd7-11ea-89d9-4dcc1310e679.png)

Closes #27549 from xuanyuanking/scala-doc.

Authored-by: Yuanjian Li <xyliyuanjian@gmail.com>
Signed-off-by: Sean Owen <srowen@gmail.com>
2020-02-16 09:55:03 -06:00

2.1 KiB
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layout title displayTitle license
global REFRESH TABLE REFRESH TABLE 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.

Description

REFRESH TABLE statement invalidates the cached entries, which include data and metadata of the given table or view. The invalidated cache is populated in lazy manner when the cached table or the query associated with it is executed again.

Syntax

{% highlight sql %} REFRESH [TABLE] table_identifier {% endhighlight %}

Parameters

table_identifier
Specifies a table name, which is either a qualified or unqualified name that designates a table/view. If no database identifier is provided, it refers to a temporary view or a table/view in the current database.

Syntax: [ database_name. ] table_name

Examples

{% highlight sql %} -- The cached entries of the table will be refreshed
-- The table is resolved from the current database as the table name is unqualified. REFRESH TABLE tbl1;

-- The cached entries of the view will be refreshed or invalidated -- The view is resolved from tempDB database, as the view name is qualified. REFRESH TABLE tempDB.view1;
{% endhighlight %}

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