Release 301 (31 Jan 2019)

General

Fix reporting of aggregate input data size stats. ({issue}100)
Add support for role management (see {doc}/sql/create-role). Note, using {doc}/sql/set-role requires an up-to-date client library. ({issue}90)
Add INVOKER security mode for {doc}/sql/create-view. ({issue}30)
Add ANALYZE SQL statement for collecting table statistics. ({issue}99)
Add {func}log function with arbitrary base. ({issue}36)
Remove the deprecated.legacy-log-function configuration option. The legacy behavior (reverse argument order) for the {func}log function is no longer available. ({issue}36)
Remove the deprecated.legacy-array-agg configuration option. The legacy behavior (ignoring nulls) for {func}array_agg is no longer available. ({issue}77)
Improve performance of COALESCE expressions. ({issue}35)
Improve error message for unsupported {func}reduce_agg state type. ({issue}55)
Improve performance of queries involving SYSTEM table sampling and computations over the columns of the sampled table. ({issue}29)

Add procedure for dumping metastore recording to a file. ({issue}54)
Add Metastore recorder support for Glue. ({issue}61)
Add hive.temporary-staging-directory-enabled configuration property and temporary_staging_directory_enabled session property to control whether a temporary staging directory should be used for write operations. ({issue}70)
Add hive.temporary-staging-directory-path configuration property and temporary_staging_directory_path session property to control the location of temporary staging directory that is used for write operations. The ${USER} placeholder can be used to use a different location for each user (e.g., /tmp/${USER}). ({issue}70)

Include session trace token in QueryCreatedEvent and QueryCompletedEvent. ({issue}24)
Fix regression in NodeManager where node list was not being refreshed on workers. ({issue}27)