[jira] [Created] (BEAM-6133) [SQL] Add support for TableMacro UDF

["Gleb Kanterov (JIRA)" <ji...@apache.org>]

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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