allisonwang-db commented on code in PR #37080:
URL: https://github.com/apache/spark/pull/37080#discussion_r918189602
##########
docs/sql-ref-syntax-qry-select-join.md:
##########
@@ -26,7 +26,7 @@ A SQL join is used to combine rows from two relations based
on join criteria. Th
### Syntax
```sql
-relation { [ join_type ] JOIN relation [ join_criteria ] | NATURAL join_type
JOIN relation }
+relation { [ join_type ] JOIN [ LATERAL ] relation [ join_criteria ] | NATURAL
join_type JOIN [ LATERAL ] relation }
Review Comment:
Should we also update the syntax reference in `sql-ref-syntax-qry-select.md`
under the `from_item`:
`[LATERAL] (subquery)`?
##########
docs/sql-ref-syntax-qry-select-lateral-subquery.md:
##########
@@ -0,0 +1,87 @@
+---
+layout: global
+title: LATERAL SUBQUERY
+displayTitle: LATERAL SUBQUERY
+license: |
+ 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
+
+`LATERAL SUBQUERY` is a subquery that is preceded by the keyword `LATERAL`. It
provides a way to cross-reference columns in the preceding FROM clause.
Review Comment:
```suggestion
`LATERAL SUBQUERY` is a subquery that is preceded by the keyword `LATERAL`.
It provides a way to reference columns in the preceding `FROM` clause.
```
##########
docs/sql-ref-syntax-qry-select-lateral-subquery.md:
##########
@@ -0,0 +1,87 @@
+---
+layout: global
+title: LATERAL SUBQUERY
+displayTitle: LATERAL SUBQUERY
+license: |
+ 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
+
+`LATERAL SUBQUERY` is a subquery that is preceded by the keyword `LATERAL`. It
provides a way to cross-reference columns in the preceding FROM clause.
+Without the `LATERAL` keyword, subqueries can only refer to columns in the
outer query, but not in the `FROM` clause. `LATERAL SUBQUERY` makes the
complicated
+queries simpler and more efficient.
+
+### Syntax
+
+```sql
+[ LATERAL ] primary_relation [ join_relation ]
+```
+
+### Parameters
+
+* **primary_relation**
+
+ Specifies the primary relation. It can be one of the following:
+ * Table relation
+ * aliased query
+
+ Syntax: `( query ) [ [ AS ] alias ]`
+ * aliased relation
Review Comment:
```suggestion
* Aliased relation
```
##########
docs/sql-ref-syntax-qry-select-lateral-subquery.md:
##########
@@ -0,0 +1,87 @@
+---
+layout: global
+title: LATERAL SUBQUERY
+displayTitle: LATERAL SUBQUERY
+license: |
+ 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
+
+`LATERAL SUBQUERY` is a subquery that is preceded by the keyword `LATERAL`. It
provides a way to cross-reference columns in the preceding FROM clause.
+Without the `LATERAL` keyword, subqueries can only refer to columns in the
outer query, but not in the `FROM` clause. `LATERAL SUBQUERY` makes the
complicated
+queries simpler and more efficient.
+
+### Syntax
+
+```sql
+[ LATERAL ] primary_relation [ join_relation ]
+```
+
+### Parameters
+
+* **primary_relation**
+
+ Specifies the primary relation. It can be one of the following:
+ * Table relation
+ * aliased query
Review Comment:
```suggestion
* Aliased query
```
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