Remove special casing for in()

Author: mattbasta

src/languages/clickhouse/clickhouse.formatter.ts

@@ -300,24 +300,6 @@ function postProcess(tokens: Token[]): Token[] {
     const nextToken = tokens[i + 1] || EOF_TOKEN;
     const prevToken = tokens[i - 1] || EOF_TOKEN;
 
-    // We want to convert IN from RESERVED_KEYWORD to RESERVED_FUNCTION_NAME
-    // when it's used as a function. Whether it's used as an operator depends on
-    // the previous token and whether the next token is an opening parenthesis.
-    if (
-      isToken.IN(token) &&
-      !(
-        prevToken.type === TokenType.IDENTIFIER ||
-        prevToken.type === TokenType.QUOTED_IDENTIFIER ||
-        prevToken.type === TokenType.NUMBER ||
-        prevToken.type === TokenType.STRING ||
-        prevToken.type === TokenType.CLOSE_PAREN ||
-        prevToken.type === TokenType.ASTERISK
-      ) &&
-      nextToken.text === '('
-    ) {
-      return { ...token, type: TokenType.RESERVED_FUNCTION_NAME };
-    }
-
     // If we have queries like
     // > GRANT SELECT, INSERT ON db.table TO john
     // > GRANT SELECT(a, b), SELECT(c) ON db.table TO john

test/clickhouse.test.ts

@@ -183,39 +183,6 @@ describe('ClickhouseFormatter', () => {
     );
   });
 
-  describe('IN set operator vs function', () => {
-    it('should respect the IN operator as a keyword when used as an operator', () => {
-      expect(format('SELECT 1 in foo;')).toBe(dedent`
-        SELECT
-          1 in foo;
-      `);
-
-      expect(format('SELECT foo in (1,2,3);')).toBe(dedent`
-        SELECT
-          foo in (1, 2, 3);
-      `);
-      expect(format('SELECT "foo" in (1,2,3);')).toBe(dedent`
-        SELECT
-          "foo" in (1, 2, 3);
-      `);
-      expect(format('SELECT 1 in (1,2,3);')).toBe(dedent`
-        SELECT
-          1 in (1, 2, 3);
-      `);
-    });
-
-    it('should respect the IN operator as a keyword when used as a function', () => {
-      expect(format('SELECT in(foo, [1,2,3]);')).toBe(dedent`
-        SELECT
-          in(foo, [1, 2, 3]);
-      `);
-      expect(format('SELECT in("foo", "bar");')).toBe(dedent`
-        SELECT
-          in("foo", "bar");
-      `);
-    });
-  });
-
   it('should support parameters', () => {
     expect(format('SELECT {foo:Uint64};', { params: { foo: "'123'" } })).toBe("SELECT\n  '123';");
     expect(format('SELECT {foo:Map(String, String)};', { params: { foo: "{'bar': 'baz'}" } })).toBe(