Release 0.102¶
Unicode Support¶
All string functions have been updated to support Unicode. The functions assume
that the string contains valid UTF-8 encoded code points. There are no explicit
checks for valid UTF-8, and the functions may return incorrect results on
invalid UTF-8. Invalid UTF-8 data can be corrected with from_utf8()
.
Additionally, the functions operate on Unicode code points and not user visible characters (or grapheme clusters). Some languages combine multiple code points into a single user-perceived character, the basic unit of a writing system for a language, but the functions will treat each code point as a separate unit.
Regular Expression Functions¶
All Regular Expression Functions have been rewritten to improve performance. The new versions are often twice as fast and in some cases can be many orders of magnitude faster (due to removal of quadratic behavior). This change introduced some minor incompatibilities that are explained in the documentation for the functions.
General Changes¶
Add support for partitioned right outer joins, which allows for larger tables to be joined on the inner side.
Add support for full outer joins.
Support returning booleans as numbers in JDBC driver
Fix
contains()
to returnNULL
if the value was not found, but aNULL
was.Fix nested ROW rendering in
DESCRIBE
.Add
array_join()
.Optimize map subscript operator.
Add
from_utf8()
andto_utf8()
functions.Add
task_writer_count
session property to settask.writer-count
.Add cast from
ARRAY(F)
toARRAY(T)
.Extend implicit coercions to
ARRAY
element types.Implement implicit coercions in
VALUES
expressions.Fix potential deadlock in scheduler.
Hive Changes¶
Collect more metrics from
PrestoS3FileSystem
.Retry when seeking in
PrestoS3FileSystem
.Ignore
InvalidRange
error inPrestoS3FileSystem
.Implement rename and delete in
PrestoS3FileSystem
.Fix assertion failure when running
SHOW TABLES FROM schema
.Fix S3 socket leak when reading ORC files.