From 42a77c2042a492a31d79200721a9421eed04969b Mon Sep 17 00:00:00 2001
From: Ben King <9087625+benfdking@users.noreply.github.com>
Date: Tue, 15 Sep 2026 12:30:28 +0200
Subject: [PATCH] feat: support Snowflake UNION BY NAME (6994)

Ported from SQLFluff 59bf84573e526900b6d891c0bc05762e7e0ab3be
https://github.com/sqlfluff/sqlfluff/pull/6994
---
 .sqlfluff-sha                                 |  2 +-
 crates/lib-dialects/src/snowflake.rs          |  6 +++
 .../snowflake/sqlfluff/select_union.sql       | 11 ++++
 .../snowflake/sqlfluff/select_union.yml       | 52 +++++++++++++++++++
 4 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/.sqlfluff-sha b/.sqlfluff-sha
index 3b23c90eda..9c8b8a822e 100644
--- a/.sqlfluff-sha
+++ b/.sqlfluff-sha
@@ -1 +1 @@
-02cda72fb6c5613079e0a0a0cd1146ba26e47167
+59bf84573e526900b6d891c0bc05762e7e0ab3be
diff --git a/crates/lib-dialects/src/snowflake.rs b/crates/lib-dialects/src/snowflake.rs
index c29970bd7f..dc8f33c6da 100644
--- a/crates/lib-dialects/src/snowflake.rs
+++ b/crates/lib-dialects/src/snowflake.rs
@@ -11846,6 +11846,12 @@ pub fn dialect(config: Option<&Value>) -> Dialect {
                 ])
                 .config(|this| this.optional())
                 .to_matchable(),
+                Sequence::new(vec![
+                    Ref::keyword("BY").to_matchable(),
+                    Ref::keyword("NAME").to_matchable(),
+                ])
+                .config(|this| this.optional())
+                .to_matchable(),
             ])
             .to_matchable(),
             Sequence::new(vec![
diff --git a/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.sql b/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.sql
index 1c0cc010af..6ed09f90ba 100644
--- a/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.sql
+++ b/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.sql
@@ -2,3 +2,14 @@ SELECT 1
 UNION
 SELECT 2
 ORDER BY 1
+;
+
+SELECT 1 AS foo
+UNION ALL BY NAME
+SELECT 2 AS foo
+;
+
+SELECT 1 AS foo
+UNION BY NAME
+SELECT 2 AS foo
+;
diff --git a/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.yml b/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.yml
index f11b887951..152ecf016e 100644
--- a/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.yml
+++ b/crates/lib-dialects/test/fixtures/dialects/snowflake/sqlfluff/select_union.yml
@@ -17,3 +17,55 @@ file:
       - keyword: ORDER
       - keyword: BY
       - numeric_literal: '1'
+- statement_terminator: ;
+- statement:
+  - set_expression:
+    - select_statement:
+      - select_clause:
+        - keyword: SELECT
+        - select_clause_element:
+          - numeric_literal: '1'
+          - alias_expression:
+            - alias_operator:
+              - keyword: AS
+            - naked_identifier: foo
+    - set_operator:
+      - keyword: UNION
+      - keyword: ALL
+      - keyword: BY
+      - keyword: NAME
+    - select_statement:
+      - select_clause:
+        - keyword: SELECT
+        - select_clause_element:
+          - numeric_literal: '2'
+          - alias_expression:
+            - alias_operator:
+              - keyword: AS
+            - naked_identifier: foo
+- statement_terminator: ;
+- statement:
+  - set_expression:
+    - select_statement:
+      - select_clause:
+        - keyword: SELECT
+        - select_clause_element:
+          - numeric_literal: '1'
+          - alias_expression:
+            - alias_operator:
+              - keyword: AS
+            - naked_identifier: foo
+    - set_operator:
+      - keyword: UNION
+      - keyword: BY
+      - keyword: NAME
+    - select_statement:
+      - select_clause:
+        - keyword: SELECT
+        - select_clause_element:
+          - numeric_literal: '2'
+          - alias_expression:
+            - alias_operator:
+              - keyword: AS
+            - naked_identifier: foo
+- statement_terminator: ;