Gleb Kanterov created BEAM-6133:
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Summary: [SQL] Add support for TableMacro UDF
Key: BEAM-6133
URL: https://issues.apache.org/jira/browse/BEAM-6133
Project: Beam
Issue Type: New Feature
Components: dsl-sql
Reporter: Gleb Kanterov
Assignee: Gleb Kanterov
Now we support only ScalarFunction UDFs. In Calcite, there are other kinds of
UDFs. With TableMacro UDFs users can connect external data sources in a similar
way as in TableProvider, but without specifying a schema, or enumerating a list
of existing tables in advance.
An example use case is connecting external metadata service and querying range
of partitions.
{code}
SELECT COUNT(*) FROM table(my_udf('dataset', start = '2017-01-01', end =
'2018-01-01'))
{code}
Where the implementation of `my_udf` will connect to this service, get file
locations for a range of partitions, and translate to PTransform reading it.
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