feat: add additional time partitioning intervals (#737)

* feat: add additional time partitioning intervals

* docstring updates based on comments

Author: stephaniewang526

google-cloud-bigquery/src/main/java/com/google/cloud/bigquery/TimePartitioning.java

@@ -37,16 +37,20 @@ public abstract class TimePartitioning implements Serializable {
   private static final long serialVersionUID = -8565064035346940951L;
 
   /**
-   * The supported types are DAY, which will generate one partition per day, and HOUR, which will
-   * generate one partition per hour. (Providing an empty string used to cause an error, but in
-   * OnePlatform the field will be treated as unset.)
+   * [Optional] The supported types are DAY, HOUR, MONTH, and YEAR, which will generate one
+   * partition per day, hour, month, and year, respectively. When the interval is not specified, the
+   * default behavior is DAY.
    */
   public enum Type {
 
-    /** Table is partitioned per day, based on data loading time. */
+    /** Table is partitioned per day. */
     DAY,
-    /** Table is partitioned per hour, based on data loading time. */
-    HOUR
+    /** Table is partitioned per hour. */
+    HOUR,
+    /** Table is partitioned per month. */
+    MONTH,
+    /** Table is partitioned per year. */
+    YEAR
   }
 
   TimePartitioning() {

google-cloud-bigquery/src/test/java/com/google/cloud/bigquery/TimePartitioningTest.java

@@ -29,6 +29,8 @@ public class TimePartitioningTest {
 
   private static final Type TYPE_DAY = Type.DAY;
   private static final Type TYPE_HOUR = Type.HOUR;
+  private static final Type TYPE_MONTH = Type.MONTH;
+  private static final Type TYPE_YEAR = Type.YEAR;
   private static final long EXPIRATION_MS = 42;
   private static final boolean REQUIRE_PARTITION_FILTER = false;
   private static final String FIELD = "field";
@@ -44,11 +46,25 @@ public class TimePartitioningTest {
           .setRequirePartitionFilter(REQUIRE_PARTITION_FILTER)
           .setField(FIELD)
           .build();
+  private static final TimePartitioning TIME_PARTITIONING_MONTH =
+      TimePartitioning.newBuilder(TYPE_MONTH)
+          .setExpirationMs(EXPIRATION_MS)
+          .setRequirePartitionFilter(REQUIRE_PARTITION_FILTER)
+          .setField(FIELD)
+          .build();
+  private static final TimePartitioning TIME_PARTITIONING_YEAR =
+      TimePartitioning.newBuilder(TYPE_YEAR)
+          .setExpirationMs(EXPIRATION_MS)
+          .setRequirePartitionFilter(REQUIRE_PARTITION_FILTER)
+          .setField(FIELD)
+          .build();
 
   @Test
   public void testOf() {
     assertEquals(TYPE_DAY, TIME_PARTITIONING_DAY.getType());
     assertEquals(TYPE_HOUR, TIME_PARTITIONING_HOUR.getType());
+    assertEquals(TYPE_MONTH, TIME_PARTITIONING_MONTH.getType());
+    assertEquals(TYPE_YEAR, TIME_PARTITIONING_YEAR.getType());
     assertEquals(EXPIRATION_MS, TIME_PARTITIONING_DAY.getExpirationMs().longValue());
     assertEquals(REQUIRE_PARTITION_FILTER, TIME_PARTITIONING_DAY.getRequirePartitionFilter());
     assertEquals(FIELD, TIME_PARTITIONING_DAY.getField());