fixes #30

Author: wumpz

src/main/javacc/net/sf/jsqlparser/parser/JSqlParserCC.jj

@@ -1191,8 +1191,14 @@ Expression InExpression() :
 
 }
 {
-	( LOOKAHEAD(3) leftExpression=SimpleExpression() { result.setLeftExpression(leftExpression); }
-		| "(" leftItemsList = SimpleExpressionList() { result.setLeftItemsList(leftItemsList); } ")"
+	( LOOKAHEAD(1) "(" ( 
+			LOOKAHEAD(SimpleExpressionList()) leftItemsList = SimpleExpressionList() { result.setLeftItemsList(leftItemsList); } 
+			|
+			leftExpression=SimpleExpression()
+		  )
+	  ")"
+	|
+		leftExpression=SimpleExpression() { result.setLeftExpression(leftExpression); }
 	)	
     [<K_NOT> { result.setNot(true); } ] <K_IN> "(" (LOOKAHEAD(SubSelect()) rightItemsList=SubSelect() | rightItemsList=SimpleExpressionList() ) ")"
 	{ 

src/test/java/net/sf/jsqlparser/test/select/SelectTest.java

@@ -989,4 +989,9 @@ public void testMultiValueIn() throws JSQLParserException {
 		String stmt = "SELECT * FROM mytable WHERE (a, b, c) IN (SELECT a, b, c FROM mytable2)";
 		assertSqlCanBeParsedAndDeparsed(stmt);
 	}
+	
+	public void testMultiValueIn2() throws JSQLParserException {
+		String stmt = "SELECT * FROM mytable WHERE (trim(a), trim(b)) IN (SELECT a, b FROM mytable2)";
+		assertSqlCanBeParsedAndDeparsed(stmt);
+	}
 }