From de7587e5fd123cf8025ef5e5dc281a5af82455c6 Mon Sep 17 00:00:00 2001
From: Max Freedom Pollard
 <272618364+MaxFreedomPollard@users.noreply.github.com>
Date: Mon, 7 Sep 2026 08:09:39 -0400
Subject: [PATCH] fix(singlestoredb): support % as the modulo operator

Formatting a SingleStoreDB query that uses % throws instead of
returning SQL:

  format('SELECT 25 % 7', { language: 'singlestoredb' })
  Parse error: Unexpected "% 7" at line 1 column 11.

SingleStore documents three equivalent modulo forms, MOD(a, b),
a MOD b and a % b. The first two format fine, the third does not.

The tokenizer builds its OPERATOR rule from a fixed standard set
(+ - / > < = <> <= >= !=) plus the dialect's own cfg.operators list,
in src/lexer/Tokenizer.ts. % is not in the standard set, and the
operators array in src/languages/singlestoredb/singlestoredb.formatter.ts
omits it, so no rule matches the character and TokenizerEngine raises a
parse error. Every MySQL-family sibling (mysql, mariadb, tidb) lists '%'
first in the same array; the SingleStoreDB copy dropped it.

Add '%' to that array, in the same leading position the siblings use.
regexFactory.operator sorts the alternatives by length descending, so
SingleStore's ::% conversion path-operator still matches before the
bare %.
---
 .../singlestoredb/singlestoredb.formatter.ts    |  1 +
 test/singlestoredb.test.ts                      | 17 ++++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/languages/singlestoredb/singlestoredb.formatter.ts b/src/languages/singlestoredb/singlestoredb.formatter.ts
index 5f4d236950..bcd917165d 100644
--- a/src/languages/singlestoredb/singlestoredb.formatter.ts
+++ b/src/languages/singlestoredb/singlestoredb.formatter.ts
@@ -265,6 +265,7 @@ export const singlestoredb: DialectOptions = {
     ],
     lineCommentTypes: ['--', '#'],
     operators: [
+      '%',
       ':=',
       '&',
       '|',
diff --git a/test/singlestoredb.test.ts b/test/singlestoredb.test.ts
index 24cd21745b..ce587bfb3e 100644
--- a/test/singlestoredb.test.ts
+++ b/test/singlestoredb.test.ts
@@ -35,7 +35,22 @@ describe('SingleStoreDbFormatter', () => {
   ]);
   supportsOperators(
     format,
-    [...standardOperators, ':=', '&', '|', '^', '~', '<<', '>>', '<=>', '&&', '||', ':>', '!:>'],
+    [
+      ...standardOperators,
+      '%',
+      ':=',
+      '&',
+      '|',
+      '^',
+      '~',
+      '<<',
+      '>>',
+      '<=>',
+      '&&',
+      '||',
+      ':>',
+      '!:>',
+    ],
     { any: true }
   );
   supportsLimiting(format, { limit: true, offset: true });