dilipbiswal commented on a change in pull request #25532:
[SPARK-28790][DOC][SQL]Document CACHE TABLE statement in SQL Reference
URL: https://github.com/apache/spark/pull/25532#discussion_r319743984
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File path: docs/sql-ref-syntax-aux-cache-cache-table.md
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@@ -19,4 +19,65 @@ license: |
limitations under the License.
---
-**This page is under construction**
+### Description
+`CACHE TABLE` statement caches the table's contents with the given storage
level. This reduces scanning of the original files in future queries.
+
+### Syntax
+{% highlight sql %}
+CACHE [ LAZY ] TABLE table_name
+ [ OPTIONS ( 'storageLevel' [ = ] value ) ] [ [ AS ] query ]
+{% endhighlight %}
+
+### Parameters
+<dl>
+ <dt><code><em>LAZY</em></code></dt>
+ <dd>Only cache the table when it is first used, instead of immediately.</dd>
+</dl>
+
+<dl>
+ <dt><code><em>table_name</em></code></dt>
+ <dd>The name of the table to be cached.</dd>
+</dl>
+
+<dl>
+ <dt><code><em>OPTIONS ( 'storageLevel' [ = ] value )</em></code></dt>
+ <dd>
+ <code>OPTIONS</code> clause with <code>storageLevel</code> key and value
pair. If a key other than <code>storageLevel</code> is used, a WARN with
message "org.apache.spark.sql.execution.command.CacheTableCommand: Invalid
options: XXXX -> XXXX" will be issued. The valid options for
<code>storageLevel</code> are:
Review comment:
@huaxingao Do we need to detail the exact warning message ? We could say "An
warning is issued when .... event occurs" ?
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