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What's changed and what's your intention?

Not sure whether source columns should be included in rw_columns. But as the columns of sinks are encompassed, I suppose source columns should also be included.

Example:

> create source src (v int) with (
            connector = 'datagen',
            fields.v.kind = 'sequence',
            fields.v.start = '1',
            fields.v.end  = '10',
            datagen.rows.per.second='15',
            datagen.split.num = '1'
        ) FORMAT PLAIN ENCODE JSON;

> SELECT column_name, data_type, table_name FROM information_schema.columns WHERE 
            table_schema = 'public';
 column_name | data_type | table_name 
-------------+-----------+------------
 v           | integer   | src

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