maropu commented on a change in pull request #26970: [SPARK-28825][SQL][DOC]
Documentation for Explain Command
URL: https://github.com/apache/spark/pull/26970#discussion_r361027978
##########
File path: docs/sql-ref-syntax-qry-explain.md
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@@ -19,4 +19,126 @@ license: |
limitations under the License.
---
-**This page is under construction**
+### Description
+
+The `EXPLAIN` statement provides the execution plan for the statement.
+By default, `EXPLAIN` provides information about the physical plan.
+`EXPLAIN` does not support `DESCRIBE TABLE` statement.
Review comment:
What does this statement mean? We can accept `EXPLAIN DESCRIBE TABLE`;
```
scala> sql("explain describe table gstest_empty").show(1, false)
+---------------------------------------------------------------------------------------------------+
|plan
|
+---------------------------------------------------------------------------------------------------+
|== Physical Plan ==
Execute DescribeTableCommand
+- DescribeTableCommand `gstest_empty`, false
|
+---------------------------------------------------------------------------------------------------+
```
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