Fix error in map_concat() when the second map is empty.
Require at least 4096 file descriptors to run Presto.
Support casting between map types.
Hive Changes
Fix incorrect skipping of data in Parquet during predicate push-down.
Fix reading of Parquet maps and lists containing nulls.
Fix reading empty ORC file with hive.orc.use-column-names enabled.
Fix writing to S3 when the staging directory is a symlink to a directory.
Legacy authorization properties, such as hive.allow-drop-table, are now
only enforced when hive.security=none is set, which is the default
security system. Specifically, the sql-standard authorization system
does not enforce these settings.