Added more Oracle compatibility: VARCHAR with type BYTE is accepted now

too. The type treaded same as CHAR.

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

@@ -3486,6 +3486,20 @@ public class Parser {
         addExpected(token);
         return false;
     }
+    
+    /*
+     * Reads passed token in list, in order and returns true on first match.
+     * If none of the token matches returns false
+     */
+    private boolean readIfOr(String ... tokens) {
+        for(String token: tokens) {
+            if (readIf(token)) {
+                return true;
+            }
+        }
+        return false;
+    }
+    
     /*
      * Reads every token in list, in order - returns true if all are found.
      * If any are not found, returns false - AND resets parsing back to state when called.
@@ -4466,7 +4480,7 @@ public class Parser {
                     }
                     original += "(" + p;
                     // Oracle syntax
-                    readIf("CHAR");
+                    readIfOr("CHAR", "BYTE");
                     if (dataType.supportsScale) {
                         if (readIf(",")) {
                             scale = readInt();

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

@@ -40,6 +40,7 @@ public class TestCompatibilityOracle extends TestBase {
         testPoundSymbolInColumnName();
         testToDate();
         testForbidEmptyInClause();
+        testSpecialTypes();
     }
 
     private void testNotNullSyntax() throws SQLException {
@@ -86,12 +87,28 @@ public class TestCompatibilityOracle extends TestBase {
         conn.close();
     }
     
+    private void testSpecialTypes() throws SQLException {
+        // Test VARCHAR, VARCHAR2 with CHAR and BYTE 
+        deleteDb("oracle");
+        Connection conn = getConnection("oracle;MODE=Oracle");
+        Statement stat = conn.createStatement();
+        stat.execute("create table T (ID NUMBER)");
+        stat.execute("alter table T add A_1 VARCHAR(1)");
+        stat.execute("alter table T add A_2 VARCHAR2(1)");
+        stat.execute("alter table T add B_1 VARCHAR(1 byte)"); // with BYTE
+        stat.execute("alter table T add B_2 VARCHAR2(1 byte)"); 
+        stat.execute("alter table T add C_1 VARCHAR(1 char)"); // with CHAR
+        stat.execute("alter table T add C_2 VARCHAR2(1 char)");
+        stat.execute("alter table T add B_255 VARCHAR(255 byte)");
+        stat.execute("alter table T add C_255 VARCHAR(255 char)");
+        stat.execute("drop table T");
+        conn.close();
+    }
     
     private void testTreatEmptyStringsAsNull() throws SQLException {
         deleteDb("oracle");
         Connection conn = getConnection("oracle;MODE=Oracle");
         Statement stat = conn.createStatement();
-
         stat.execute("CREATE TABLE A (ID NUMBER, X VARCHAR2(1))");
         stat.execute("INSERT INTO A VALUES (1, 'a')");
         stat.execute("INSERT INTO A VALUES (2, '')");