Update statements with a column list in brackets did not work if the list only contains one column.

h2/src/docsrc/html/changelog.html

@@ -19,7 +19,9 @@ Change Log
 <h1>Change Log</h1>
 
 <h2>Next Version (unreleased)</h2>
-<ul><li>Read-only databases in a zip file did not work when using the -baseDir option.
+<ul><li>Update statements with a column list in brackets did not work if the list only contains one column.
+    Example: update test set (id)=(id).    
+</li><li>Read-only databases in a zip file did not work when using the -baseDir option.
 </li><li>Issue 334: SimpleResultSet.getString now also works for Clob columns.
 </li><li>Subqueries with an aggregate did not always work. Example:
     select (select count(*) from test where a = t.a and b = 0) from test t group by a

h2/src/main/org/h2/command/Parser.java

@@ -671,13 +671,18 @@ public class Parser {
             read(")");
             read("=");
             Expression expression = readExpression();
-            for (int i = 0, size = columns.size(); i < size; i++) {
-                Column column = columns.get(i);
-                Function f = Function.getFunction(database, "ARRAY_GET");
-                f.setParameter(0, expression);
-                f.setParameter(1, ValueExpression.get(ValueInt.get(i + 1)));
-                f.doneWithParameters();
-                command.setAssignment(column, f);
+            if (columns.size() == 1) {
+                // the expression is parsed as a simple value
+                command.setAssignment(columns.get(0), expression);
+            } else {
+                for (int i = 0, size = columns.size(); i < size; i++) {
+                    Column column = columns.get(i);
+                    Function f = Function.getFunction(database, "ARRAY_GET");
+                    f.setParameter(0, expression);
+                    f.setParameter(1, ValueExpression.get(ValueInt.get(i + 1)));
+                    f.doneWithParameters();
+                    command.setAssignment(column, f);
+                }
             }
         } else {
             do {

h2/src/test/org/h2/test/test-1.3.txt

@@ -91,6 +91,9 @@ create table test(id int primary key, name varchar(255), row_number int);
 insert into test values(1, 'hello', 10), (2, 'world', 20);
 > update count: 2
 
+update test set (id)=(id);
+> update count: 2
+
 select row_number() over(), id, name from test order by id;
 > ROWNUM() ID NAME
 > -------- -- -----