Hi, I am trying to implement a custom function that evaluates fields stored as type "binary" (BinaryField).
I have my ValueSourceParser set up and I can retrieve the arguments of my function correctly and have a reference to the SchemaField. Now I am a bit stuck, how I can retrieve the binary content from a ValueSource? Let's make this easier with an example. Let's say I have a field named "fingerprint" defined as binary and I want to implement a custom function "norm" that computes an integer from that binary content that can be used in sorting or whatever. The field is declared like this: <field name="fingerprint" type="binary" indexed="true" stored="true" multiValued="false"/> I use "norm(fingerprint)" as my sorting expression and it arrives fine in my ValueSourceParser. To obtain a value source to use for the field value I tried two things: 1) parse the value source using parseValueSource() 2) parse the field name using parseId() and then something like: SchemaField schemaField = fp.getReq().getSchema().getField(arg1); ValueSource fieldValueSource = schemaField.getType().getValueSource(schemaField, fp); I thought I would just use that value source in my custom FingerprintNormValueSource to retrieve the byte array via the method org.apache.lucene.queries.function.FunctionValues#objectVal, however, that always returns null for my documents. Now I noticed that the ValueSource I get for the field is an instance of org.apache.solr.schema.StrFieldSource and there objectVal is implemented as strVal, which obviously will never return my fingerprint byte array. Do I have to encode my byte arrays as strings or is there a direct way to retrieve the binary data for use in my custom ValueSource? Thanks a lot, Robert
