I have a problem using kettle with blob images.
I've a MySQL db as Table Input. In this db there is stored an attribute with blob images. If I don't enable lazy conversion, the output image will be damaged. So, I nedd to enable lazy conversion for the input and then use Select Value to set that attribute to be Binary.
I also have a CSV file as input. If I do a full outer join between this file (with or with lazy conversion) and the MySQL db (without lazy conversion), I get this error:

2014/12/01 13:35:56 - Merge Join 2.0 - ERROR (version 5.2.0.0, build 1 from 2014-09-30_19-48-28 by buildguy) : Unexpected error
2014/12/01 13:35:56 - Merge Join 2.0 - ERROR (version 5.2.0.0, build 1 from 2014-09-30_19-48-28 by buildguy) : org.pentaho.di.core.exception.KettleValueException:
2014/12/01 13:35:56 - Merge Join 2.0 - String<binary-string> : Unable to compare with value [Number(15, 2)]
2014/12/01 13:35:56 - Merge Join 2.0 - Unable to verify if [domicilio_rmn String<binary-string>] is null or not because of an error:java.lang.ClassCastException: java.lang.String cannot be cast to [B
2014/12/01 13:35:56 - Merge Join 2.0 -
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.core.row.value.ValueMetaBase.compare(ValueMetaBase.java:3577)
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.core.row.RowMeta.compare(RowMeta.java:827)
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.trans.steps.mergejoin.MergeJoin.processRow(MergeJoin.java:185)
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.trans.step.RunThread.run(RunThread.java:62)
2014/12/01 13:35:56 - Merge Join 2.0 - at java.lang.Thread.run(Thread.java:745)
2014/12/01 13:35:56 - Merge Join 2.0 - Caused by: java.lang.RuntimeException: Unable to verify if [domicilio_rmn String<binary-string>] is null or not because of an error:java.lang.ClassCastException: java.lang.String cannot be cast to [B
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.core.row.value.ValueMetaBase.isNull(ValueMetaBase.java:3382)
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.core.row.value.ValueMetaBase.compare(ValueMetaBase.java:3416)
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.core.row.value.ValueMetaBase.compare(ValueMetaBase.java:3575)
2014/12/01 13:35:56 - Merge Join 2.0 - ... 4 more
2014/12/01 13:35:56 - Merge Join 2.0 - Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to [B
2014/12/01 13:35:56 - Merge Join 2.0 - at org.pentaho.di.core.row.value.ValueMetaBase.isNull(ValueMetaBase.java:3353)
2014/12/01 13:35:56 - Merge Join 2.0 - ... 6 more

Basically, I'm not able to do a full outer join between a MySQL DB with lazy conversion and a CSV file. I've tried using Text File Input instead of CSV, but I have the same error.

Any suggestion?

Thanks in advance.