v0.10.0

Added

• Pathway now warns when unintentionally creating Table with empty universe.
• pw.io.kafka.write in raw and plaintext formats now supports output for tables with multiple columns. For such tables, it requires the specification of the column that must be used as a value of the produced Kafka messages and gives a possibility to provide column which must be used as a key.
• pw.io.kafka.write can now output values from the table using Kafka message headers in 'raw' and 'plaintext' output format.

Changed

• instance arguments to groupby, join, with_id_from now determine how entries are distributed between machines.
• flatten results remain on the same machine as their source entries.
• join sends each record between machines at most once.
• BREAKING: flatten, join, groupby (if used with instance), with_id_from (if used with instance) generate IDs of the produced rows differently than in the previous versions.
• pathway spawn with multiple workers prints only output from the first worker.