Merge branch 'ps-part2a-metadata' into ps-part2b-temporal-setters

Author: Neenu1995

java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryJdbcTypeMappings.java

@@ -125,8 +125,9 @@ static StandardSQLTypeName classToType(Class type)
       return StandardSQLTypeName.NUMERIC;
     } else if (Date.class.isAssignableFrom(type) || LocalDate.class.isAssignableFrom(type)) {
       return StandardSQLTypeName.DATE;
+    } else if (LocalDateTime.class.isAssignableFrom(type)) {
+      return StandardSQLTypeName.DATETIME;
     } else if (Timestamp.class.isAssignableFrom(type)
-        || LocalDateTime.class.isAssignableFrom(type)
         || OffsetDateTime.class.isAssignableFrom(type)
         || Instant.class.isAssignableFrom(type)
         || ZonedDateTime.class.isAssignableFrom(type)) {

java-bigquery-jdbc/src/main/java/com/google/cloud/bigquery/jdbc/BigQueryParameterMetaData.java

@@ -120,9 +120,11 @@ public String getParameterClassName(int param) throws SQLException {
         return clazz.getName();
       }
     }
-    Class<?> boundType = this.parameterHandler.getType(param);
-    if (boundType != null) {
-      return boundType.getName();
+    if (this.parameterHandler != null) {
+      Class<?> boundType = this.parameterHandler.getType(param);
+      if (boundType != null) {
+        return boundType.getName();
+      }
     }
     return Object.class.getName();
   }