From dc6bec6fe96ff8a05f3d948e5a6c0c70cd5fa1b4 Mon Sep 17 00:00:00 2001
From: Manfred Moser <manfred@simpligility.ca>
Date: Wed, 14 Oct 2026 22:44:25 -0700
Subject: [PATCH] Support underscores in Trino numeric literals

Trino accepts underscores as digit separators, for example 1_000_000,
but the Trino dialect rejected them with a parse error.
---
 src/languages/trino/trino.formatter.ts | 2 ++
 test/trino.test.ts                     | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/languages/trino/trino.formatter.ts b/src/languages/trino/trino.formatter.ts
index bcb9d54dc1..9fe0488d60 100644
--- a/src/languages/trino/trino.formatter.ts
+++ b/src/languages/trino/trino.formatter.ts
@@ -155,6 +155,8 @@ export const trino: DialectOptions = {
     // https://trino.io/docs/current/language/reserved.html
     identTypes: ['""-qq'],
     paramTypes: { positional: true },
+    // https://trino.io/docs/current/language/types.html#integer
+    underscoresInNumbers: true,
     operators: [
       '%',
       '->',
diff --git a/test/trino.test.ts b/test/trino.test.ts
index f546ebe485..f397f883d1 100644
--- a/test/trino.test.ts
+++ b/test/trino.test.ts
@@ -33,7 +33,7 @@ describe('TrinoFormatter', () => {
   const format: FormatFn = (query, cfg = {}) => originalFormat(query, { ...cfg, language });
 
   behavesLikeSqlFormatter(format);
-  supportsNumbers(format);
+  supportsNumbers(format, { underscore: true });
   supportsComments(format);
   supportsCommentOn(format);
   supportsCreateView(format, { orReplace: true, materialized: true });