dongjoon-hyun commented on a change in pull request #30816:
URL: https://github.com/apache/spark/pull/30816#discussion_r553711463
##########
File path: docs/sql-ref-syntax-qry-select.md
##########
@@ -151,6 +151,18 @@ SELECT [ hints , ... ] [ ALL | DISTINCT ] {
named_expression [ , ... ] }
Specifies aliases for one or more source window specifications. The
source window specifications can
be referenced in the widow definitions in the query.
+
+* **regex_column_names**
+
+ When `spark.sql.parser.quotedRegexColumnNames` is true, quoted
identifiers (using backticks) in `SELECT`
+ statement are interpreted as regular expressions and `SELECT` statement
can take regex-based column specification.
+ For example, below SQL will only take column `c`:
+
+ ```sql
+ SELECT `(a|b)?+.+` FROM (
+ SELECT 1 as a, 2 as b, 3 as c
+ ) src
Review comment:
```
spark-sql> SELECT a FROM (SELECT 1 as a, 2 as b, 3 as c);
1
```
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