[ARROW-7301][Java] Resolve comments

Author: liyafan82

java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/JdbcToArrowUtils.java

@@ -210,7 +210,7 @@ public static Schema jdbcToArrowSchema(ResultSetMetaData rsmd, JdbcToArrowConfig
    *   <li>BINARY --> ArrowType.Binary</li>
    *   <li>VARBINARY --> ArrowType.Binary</li>
    *   <li>LONGVARBINARY --> ArrowType.Binary</li>
-   *   <li>DATE --> ArrowType.Date(DateUnit.MILLISECOND)</li>
+   *   <li>DATE --> ArrowType.Date(DateUnit.DAY)</li>
    *   <li>TIME --> ArrowType.Time(TimeUnit.MILLISECOND, 32)</li>
    *   <li>TIMESTAMP --> ArrowType.Timestamp(TimeUnit.MILLISECOND, calendar timezone)</li>
    *   <li>CLOB --> ArrowType.Utf8</li>

java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/DateConsumer.java

@@ -17,10 +17,13 @@
 
 package org.apache.arrow.adapter.jdbc.consumer;
 
+import java.sql.Date;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
 import java.util.Calendar;
-import java.util.Date;
+import java.util.concurrent.TimeUnit;
 
 import org.apache.arrow.vector.DateDayVector;
 import org.apache.arrow.vector.DateMilliVector;
@@ -31,6 +34,23 @@
  */
 public class DateConsumer {
 
+  /**
+   * The number of milli-seconds in a day.
+   */
+  public static final long MILLIS_PER_DAY = TimeUnit.DAYS.toMillis(1);
+
+  public static final int MAX_DAY;
+
+  static {
+    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
+    try {
+      java.util.Date date = dateFormat.parse("9999-12-31");
+      MAX_DAY = (int) (date.getTime() / MILLIS_PER_DAY);
+    } catch (ParseException e) {
+      throw new IllegalArgumentException("Failed to parse max day", e);
+    }
+  }
+
   /**
    * Creates a consumer for {@link DateMilliVector}.
    */
@@ -70,7 +90,11 @@ public void consume(ResultSet resultSet) throws SQLException {
       Date date = calendar == null ? resultSet.getDate(columnIndexInResultSet) :
           resultSet.getDate(columnIndexInResultSet, calendar);
       if (!resultSet.wasNull()) {
-        vector.setSafe(currentIndex, (int) (date.getTime() / DateDayVector.MILLIS_PER_DAY));
+        int day = (int) (date.getTime() / MILLIS_PER_DAY);
+        if (day < 0 || day > MAX_DAY) {
+          throw new IllegalArgumentException("Day overflow: " + day);
+        }
+        vector.setSafe(currentIndex, day);
       }
       currentIndex++;
     }
@@ -102,7 +126,11 @@ public NonNullableDateConsumer(DateDayVector vector, int index, Calendar calenda
     public void consume(ResultSet resultSet) throws SQLException {
       Date date = calendar == null ? resultSet.getDate(columnIndexInResultSet) :
           resultSet.getDate(columnIndexInResultSet, calendar);
-      vector.setSafe(currentIndex, (int) (date.getTime() / DateDayVector.MILLIS_PER_DAY));
+      int day = (int) (date.getTime() / MILLIS_PER_DAY);
+      if (day < 0 || day > MAX_DAY) {
+        throw new IllegalArgumentException("Day overflow: " + day);
+      }
+      vector.setSafe(currentIndex, day);
       currentIndex++;
     }
   }

java/vector/src/main/java/org/apache/arrow/vector/DateDayVector.java

@@ -38,11 +38,6 @@
  */
 public final class DateDayVector extends BaseFixedWidthVector {
 
-  /**
-   * The number of milli-seconds in a day.
-   */
-  public static final long  MILLIS_PER_DAY = 3600 * 24 * 1000L;
-
   private static final byte TYPE_WIDTH = 4;
   private final FieldReader reader;