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Applies to: 
Databricks SQL
The MAX_FILE_PARTITION_BYTES configuration parameter controls the maximum size of partitions when reading from a file data source.
This affects the degree of parallelism for processing of the data source.
Settings
The setting can be any positive integral number and optionally include a measure such as b (bytes), k or kb (1024 bytes).
You can set this parameter at the session level using the SET statement.
System default
The system default is 128m (128 mebibytes).
Examples
> SET max_file_partition_bytes = 64mb;