From 145f4908cdcec7ad8a402377c956bf1e75a5c090 Mon Sep 17 00:00:00 2001
From: Kenny Wong <79668578+wong-codaio@users.noreply.github.com>
Date: Mon, 17 Jan 2022 04:55:11 -0500
Subject: [PATCH] Support Snowflake column rename (#2327)

---
 src/sqlfluff/dialects/dialect_snowflake.py      |  9 ++++++++-
 .../snowflake/snowflake_alter_table_column.sql  |  4 ++++
 .../snowflake/snowflake_alter_table_column.yml  | 17 ++++++++++++++++-
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/src/sqlfluff/dialects/dialect_snowflake.py b/src/sqlfluff/dialects/dialect_snowflake.py
index c2f395e228e..7a85618c61d 100644
--- a/src/sqlfluff/dialects/dialect_snowflake.py
+++ b/src/sqlfluff/dialects/dialect_snowflake.py
@@ -959,7 +959,14 @@ class AlterTableTableColumnActionSegment(BaseSegment):
     match_grammar = Sequence(
         OneOf(
             # @TODO: Add Column
-            # @TODO: Rename column
+            # Rename column
+            Sequence(
+                "RENAME",
+                "COLUMN",
+                Ref("ColumnReferenceSegment"),
+                "TO",
+                Ref("ColumnReferenceSegment"),
+            ),
             # Alter/Modify column(s)
             Sequence(
                 OneOf("ALTER", "MODIFY"),
diff --git a/test/fixtures/dialects/snowflake/snowflake_alter_table_column.sql b/test/fixtures/dialects/snowflake/snowflake_alter_table_column.sql
index 8ad02a4421f..2a501f00d2e 100644
--- a/test/fixtures/dialects/snowflake/snowflake_alter_table_column.sql
+++ b/test/fixtures/dialects/snowflake/snowflake_alter_table_column.sql
@@ -33,3 +33,7 @@ alter table empl_info modify
 -- DROP COLUMN
 ALTER TABLE empl_info DROP COLUMN my_column;
 ALTER TABLE some_schema.empl_info DROP COLUMN my_column;
+
+
+-- Rename column
+ALTER TABLE empl_info RENAME COLUMN old_col_name TO new_col_name;
diff --git a/test/fixtures/dialects/snowflake/snowflake_alter_table_column.yml b/test/fixtures/dialects/snowflake/snowflake_alter_table_column.yml
index e8bba8f87cb..8f93e3be77a 100644
--- a/test/fixtures/dialects/snowflake/snowflake_alter_table_column.yml
+++ b/test/fixtures/dialects/snowflake/snowflake_alter_table_column.yml
@@ -3,7 +3,7 @@
 # computed by SQLFluff when running the tests. Please run
 # `python test/generate_parse_fixture_yml.py`  to generate them after adding or
 # altering SQL files.
-_hash: ceacb0017f29185609aade7a85afc1b23121f52bd2080202295cdb5d58d83cd0
+_hash: 4db9f464f87c27464350e4314b93708eeda0b3c5b6d44a95cd0984edd9b01dbb
 file:
 - statement:
     alter_table_statement:
@@ -202,3 +202,18 @@ file:
       - column_reference:
           identifier: my_column
 - statement_terminator: ;
+- statement:
+    alter_table_statement:
+    - keyword: ALTER
+    - keyword: TABLE
+    - table_reference:
+        identifier: empl_info
+    - alter_table_table_column_action:
+      - keyword: RENAME
+      - keyword: COLUMN
+      - column_reference:
+          identifier: old_col_name
+      - keyword: TO
+      - column_reference:
+          identifier: new_col_name
+- statement_terminator: ;