MODAUD-180 updates sql

mod-audit-server/src/main/java/org/folio/dao/acquisition/impl/PieceEventsDaoImpl.java

@@ -40,16 +40,16 @@ public class PieceEventsDaoImpl implements PieceEventsDao {
   private static final String GET_STATUS_CHANGE_HISTORY_BY_PIECE_ID_SQL = """
     WITH StatusChanges AS (
       SELECT id, action, piece_id, user_id, event_date, action_date, modified_content_snapshot,
-        COALESCE(LAG(modified_content_snapshot ->> 'receivingStatus') OVER w, '') AS previous_status,
-        COALESCE(LAG(modified_content_snapshot ->> 'claimingInterval') OVER w, '') AS previous_claiming_interval
+        LAG(modified_content_snapshot ->> 'receivingStatus') OVER w AS previous_status,
+        LAG(modified_content_snapshot ->> 'claimingInterval') OVER w AS previous_claiming_interval
       FROM %s
       WHERE piece_id=$1
       WINDOW w AS (PARTITION BY piece_id ORDER BY action_date)
     )
     SELECT id, action, piece_id, user_id, event_date, action_date, modified_content_snapshot
     FROM StatusChanges
-    WHERE modified_content_snapshot ->> 'receivingStatus' <> previous_status
-       OR modified_content_snapshot ->> 'claimingInterval' <> previous_claiming_interval
+    WHERE modified_content_snapshot ->> 'receivingStatus' IS DISTINCT FROM previous_status
+       OR modified_content_snapshot ->> 'claimingInterval' IS DISTINCT FROM previous_claiming_interval
     %s LIMIT $2 OFFSET $3
     """;