Merge pull request #523 from stumc/Issue#458

Issue#458 TIMESTAMPDIFF YEAR fix

h2/src/main/org/h2/expression/Function.java

@@ -1887,11 +1887,11 @@ public class Function extends Expression implements FunctionCall {
         calendar.setTimeInMillis(t2);
         int year2 = calendar.get(Calendar.YEAR);
         int month2 = calendar.get(Calendar.MONTH);
-        int result = year2 - year1;
+        int yearResult = year2 - year1;
         if (field == Calendar.MONTH) {
-            return 12 * result + (month2 - month1);
+            return 12 * yearResult + (month2 - month1);
         } else if (field == Calendar.YEAR) {
-            return result;
+            return (12 * yearResult + (month2 - month1))/12;
         } else {
             throw DbException.getUnsupportedException("DATEDIFF " + part);
         }

h2/src/test/org/h2/test/db/TestScriptSimple.java

@@ -11,6 +11,7 @@ import java.io.LineNumberReader;
 import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+
 import org.h2.test.TestBase;
 import org.h2.util.ScriptReader;
 
@@ -72,6 +73,7 @@ public class TestScriptSimple extends TestBase {
         }
         conn.close();
         deleteDb("scriptSimple");
+        
     }
 
     private void reconnect() throws SQLException {

h2/src/test/org/h2/test/testScript.sql

@@ -9909,15 +9909,29 @@ select dateadd('year', -1, timestamp '2000-02-29 10:20:30.012345678') d1 from te
 > 1999-02-28 10:20:30.012345678
 > rows: 1
 
+-- Only 2 months difference, not a whole year
 select datediff('yy', timestamp '2003-12-01 10:20:30.0', timestamp '2004-01-01 10:00:00.0') d1 from test;
 > D1
 > --
+> 0
+> rows: 1
+
+select datediff('yy', timestamp '2003-12-01 10:20:30.0', timestamp '2004-12-01 10:20:30.0') d1 from test;
+> D1
+> --
 > 1
 > rows: 1
 
+-- Only 2 months difference, not a whole year
 select datediff('year', timestamp '2003-12-01 10:20:30.0', timestamp '2004-01-01 10:00:00.0') d1 from test;
 > D1
 > --
+> 0
+> rows: 1
+
+select datediff('year', timestamp '2003-12-01 10:20:30.0', timestamp '2004-12-01 10:20:30.0') d1 from test;
+> D1
+> --
 > 1
 > rows: 1
 

h2/src/tools/org/h2/dev/util/ImmutableArray.java

@@ -111,6 +111,7 @@ public final class ImmutableArray<K> implements Iterable<K> {
      * @param array the data
      * @return the new immutable array
      */
+    @SafeVarargs
 	public static <K> ImmutableArray<K> create(K... array) {
         return new ImmutableArray<K>(array);
     }

h2/src/tools/org/h2/dev/util/ImmutableArray2.java

@@ -151,6 +151,7 @@ public final class ImmutableArray2<K> implements Iterable<K> {
      * @param array the data
      * @return the new immutable array
      */
+    @SafeVarargs
 	public static <K> ImmutableArray2<K> create(K... array) {
         return new ImmutableArray2<K>(array, array.length);
     }

h2/src/tools/org/h2/dev/util/ImmutableArray3.java

@@ -84,6 +84,7 @@ public abstract class ImmutableArray3<K> implements Iterable<K> {
      * @param array the data
      * @return the new immutable array
      */
+    @SafeVarargs
 	public static <K> ImmutableArray3<K> create(K... array) {
         return new Plain<K>(array);
     }