Hi David, thanks for getting back.
>From what you've said, I think we'll need to convert our GenericRecord into
>structured types - do you have any references or examples I can have a look
>at? If not, perhaps you could just show me a basic example of flattening a
>complex object with accessors into a Table of structured types. Or by
>structured types, did you mean Row?
// ah
From: Dawid Wysakowicz <dwysakow...@apache.org>
Sent: Monday, January 6, 2020 9:32 AM
To: Hailu, Andreas [Engineering] <andreas.ha...@ny.email.gs.com>;
user@flink.apache.org
Cc: Richards, Adam S [Engineering] <adam.richa...@ny.email.gs.com>
Subject: Re: Table API: Joining on Tables of Complex Types
Hi Andreas,
First of all I would highly recommend converting a non-structured types to
structured types as soon as possible as it opens more possibilities to optimize
the plan.
Have you tried:
Table users =
batchTableEnvironment.fromDataSet(usersDataset).select("getField(f0, userName)
as userName", "f0")
Table other =
batchTableEnvironment.fromDataSet(otherDataset).select("getField(f0, userName)
as user", "f1")
Table result = other.join(users, "user = userName")
You could also check how the
org.apache.flink.formats.avro.AvroRowDeserializationSchema class is implemented
which internally converts an avro record to a structured Row.
Hope this helps.
Best,
Dawid
On 03/01/2020 23:16, Hailu, Andreas wrote:
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
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