Rumble 1.9.0 "Ficus Bonsai" beta

• Left-outer equi-joins with let clauses: if you have two large tabular datasets, Rumble can nest one into the other with just a few lines of code, and fast.
• Inner equi-joins and generic joins with where clauses are detected.
• Renamed --result-size to --materialization-size to avoid confusion, and adding more hints about --output-path for getting the complete output from a parallel query.
• New CLI options --output-format and output-format-option:* for outputting structured output to other formats than JSON (Parquet, CSV...).
• New CLI option --number-of-output-partitions to repartition the output as desired
• New function local-text-file() to read a file as a sequence of string items, but without Spark parallelism (streaming instead). This makes Rumble faster for smaller files
• Performance improvements for FLWOR queries on structured data (Avro, Parquet, structured JSON, CSV)...
• Performance improvement for when parallelism is not used at all
• Stability improvement for json-doc(), which will now also work after json-file() has been used.