Restore limited support of DATETIME2

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

@@ -4465,7 +4465,7 @@ public class Parser {
                         precision = displaySize = ValueTimestampTimeZone.getDisplaySize(originalScale);
                         break;
                     }
-                } else if (original.equals("DATETIME")) {
+                } else if (original.equals("DATETIME") || original.equals("DATETIME2")) {
                     if (readIf("(")) {
                         originalScale = readPositiveInt();
                         if (originalScale > ValueTime.MAXIMUM_SCALE) {

h2/src/test/org/h2/test/scripts/datatypes/timestamp.sql

@@ -16,7 +16,9 @@ SELECT T1, T2, T1 = T2 FROM TEST;
 > rows: 1
 
 ALTER TABLE TEST ADD (T3 TIMESTAMP(0), T4 TIMESTAMP(9) WITHOUT TIME ZONE,
-    DT1 DATETIME, DT2 DATETIME(0), DT3 DATETIME(9), SDT1 SMALLDATETIME);
+    DT1 DATETIME, DT2 DATETIME(0), DT3 DATETIME(9),
+    DT2_1 DATETIME2, DT2_2 DATETIME2(0), DT2_3 DATETIME2(7),
+    SDT1 SMALLDATETIME);
 > ok
 
 SELECT COLUMN_NAME, DATA_TYPE, TYPE_NAME, COLUMN_TYPE, NUMERIC_SCALE FROM INFORMATION_SCHEMA.COLUMNS
@@ -30,8 +32,11 @@ SELECT COLUMN_NAME, DATA_TYPE, TYPE_NAME, COLUMN_TYPE, NUMERIC_SCALE FROM INFORM
 > DT1         93        TIMESTAMP DATETIME                       6
 > DT2         93        TIMESTAMP DATETIME(0)                    0
 > DT3         93        TIMESTAMP DATETIME(9)                    9
+> DT2_1       93        TIMESTAMP DATETIME2                      6
+> DT2_2       93        TIMESTAMP DATETIME2(0)                   0
+> DT2_3       93        TIMESTAMP DATETIME2(7)                   7
 > SDT1        93        TIMESTAMP SMALLDATETIME                  0
-> rows (ordered): 8
+> rows (ordered): 11
 
 ALTER TABLE TEST ADD T5 TIMESTAMP(10);
 > exception INVALID_VALUE_SCALE_PRECISION
@@ -39,6 +44,9 @@ ALTER TABLE TEST ADD T5 TIMESTAMP(10);
 ALTER TABLE TEST ADD DT4 DATETIME(10);
 > exception INVALID_VALUE_SCALE_PRECISION
 
+ALTER TABLE TEST ADD DT2_4 DATETIME2(10);
+> exception INVALID_VALUE_SCALE_PRECISION
+
 ALTER TABLE TEST ADD STD2 SMALLDATETIME(1);
 > exception SYNTAX_ERROR_1