Hi Amol,
the dot operation is reserved for calling functions on fields. If you
want to get a nested field in the Table API, use the
`.get("applicationId")` operation. See also [1] under "Value access
functions".
Regards,
Timo
[1]
https://ci.apache.org/projects/flink/flink-docs-release-1.5/dev/table/tableApi.html#built-in-functions
Am 27.07.18 um 09:10 schrieb Amol S - iProgrammer:
Hello Fabian,
I am streaming my mongodb oplog using flink and want to use flink table API
to join multiple tables. My code looks like
DataStream<Oplog> streamSource = env
.addSource(kafkaConsumer)
.setParallelism(4);
StreamTableEnvironment tableEnv = TableEnvironment.getTableEnvironment(env);
// Convert the DataStream into a Table with default fields "f0", "f1"
Table table1 = tableEnv.fromDataStream(streamSource);
Table master = table1.filter("ns === 'Master'").select("o as master,
o.applicationId as primaryKey");
Table child1 = table1.filter("ns === 'Child1'").select("o as child1,
o.applicationId as foreignKey");
Table child2 = table1.filter("ns === 'Child2'").select("o as child2,
o.applicationId as foreignKey2");
Table result =
master.join(child1).where("primaryKey==foreignKey").join(child2).where("primaryKey==foreignKey2");
it is throwing error "Method threw
'org.apache.flink.table.api.ValidationException' exception. Undefined
function: APPLICATIONID"
public class Oplog implements Serializable{
private BasicDBObject o;
}
Where o is generic java type for fetching mongodb oplog and I can not
replace this generic type with static pojo's. please tell me any work
around on this.
BasicDBObject suffice following two rules
-
The class must be public.
-
It must have a public constructor without arguments (default constructor)
and we can access class members through basicDBObject.getString("abc")
-----------------------------------------------
*Amol Suryawanshi*
Java Developer
am...@iprogrammer.com
*iProgrammer Solutions Pvt. Ltd.*
*Office 103, 104, 1st Floor Pride Portal,Shivaji Housing Society,
Bahiratwadi,Near Hotel JW Marriott, Off Senapati Bapat Road, Pune - 411016,
MH, INDIA.**Phone: +91 9689077510 | Skype: amols_iprogrammer*
www.iprogrammer.com <sac...@iprogrammer.com>
------------------------------------------------
