#900 - Error - Can't fetch JsonDB field - org.postgresql.util.PSQLException: ERROR: could not identify an equality operator for type json

src/main/java/io/ebeaninternal/server/query/SqlTreeNodeRoot.java

@@ -25,6 +25,18 @@ final class SqlTreeNodeRoot extends SqlTreeNodeBean {
     this.includeJoin = includeJoin;
   }
 
+  /**
+   * Append the property columns to the buffer.
+   */
+  public void appendDistinctOn(DbSqlContext ctx, boolean subQuery) {
+    if (readId) {
+      ctx.pushTableAlias(prefix);
+      appendSelectId(ctx, idBinder.getBeanProperty());
+      ctx.popTableAlias();
+      super.appendDistinctOn(ctx, subQuery);
+    }
+  }
+
   /**
    * Set AsOf support (at root level).
    */