Hi folks,
I'm trying to join two Tables which are composed of complex types, Avro's
GenericRecord to be exact. I have to use a custom UDF to extract fields out of
the record and I'm having some trouble on how to do joins on them as I need to
call this UDF to read what I need. Example below:
batchTableEnvironment.registerFunction("getField", new GRFieldExtractor()); //
GenericRecord field extractor
Table users = batchTableEnvironment.fromDataSet(usersDataset); // Converting
from some pre-existing DataSet
Table otherDataset = batchTableEnvironment.fromDataSet(someOtherDataset);
Table userNames = t.select("getField(f0, userName)"); // This is how the UDF is
used, as GenericRecord is a complex type requiring you to invoke a get() method
on the field you're interested in. Here we get a get on field 'userName'
I'd like to do something using the Table API similar to the query "SELECT *
from otherDataset WHERE otherDataset.userName = users.userName". How is this
done?
Best,
Andreas
The Goldman Sachs Group, Inc. All rights reserved.
See http://www.gs.com/disclaimer/global_email for important risk disclosures,
conflicts of interest and other terms and conditions relating to this e-mail
and your reliance on information contained in it. This message may contain
confidential or privileged information. If you are not the intended recipient,
please advise us immediately and delete this message. See
http://www.gs.com/disclaimer/email for further information on confidentiality
and the risks of non-secure electronic communication. If you cannot access
these links, please notify us by reply message and we will send the contents to
you.
________________________________
Your Personal Data: We may collect and process information about you that may
be subject to data protection laws. For more information about how we use and
disclose your personal data, how we protect your information, our legal basis
to use your information, your rights and who you can contact, please refer to:
www.gs.com/privacy-notices<http://www.gs.com/privacy-notices>
