DolphinDB Release Notes

DolphinDB Server

Version: 0.99.0

Release Date: 2019-10-25

New Features

Added 3 new 16-byte data types: UUID, IP and INT128. These data types can be used to create partitioned tables with HASH domain.
Added function createTable to create dimension tables (non-partitioned tables) in a partitioned database.
Added function keyedStreamTable. A keyedStreamTable does not allow rows with duplicate values of keyColumn. A new record cannot be written to a keyedStreamTable if it has identical value of keyColumn as a row in the keyedStreamTable.
Added encoding conversion functions: toUTF8, fromUTF8, and convertEncode. For Windows version, only the conversion between gbk and utf-8 is supported. For Linux version, conversions between any encoding are supported.
Added function replaceColumn! to change the content or data type of a column of an in-memory table.
Added function reorderColumn! to adjust the column order of an in-memory table.
Added function evaltimer to assign the execution time of a function to a variable.
Added function setColumnComment to comment on columns of a DFS table.
Added string functions md5 and crc32 to hash a string.
Added function hex to display integers in hexadecimal format.
Added function concatDateTime that combines a DATE-type object and an object of type SECOND, TIME or NANOTIME to one object.
Added function isDuplicated to mark duplicate values in one or multiple vectors.

Improvements

Added function enableTableShareAndPersistence to guarantee the atomicity of two operations(share and enableTablePersistence) on a streaming table, thus solving the problem that concurrent subscriptions may fail due to lack of atomicity.
Improved the performance of string functions including left, right, startsWith, endsWith, substr, substru, lpad, rpad, strReplace, and strpos
Function transpose now supports dictionaries and tables.

Upgrade Instructions

Many new features such as the new data types, dimension table and column comments in this release require the latest version of GUI.
Must use the latest version of GUI to browse partitioned tables in the variable panel.
The folder server/web needs to be updated.

Added keywords: UUID, IP and INT128.
Support schema browsing for partitioned tables.
Support browsing of dimension tables.
When there are multiple controllers in a cluster, the web-based cluster manager will automatically locate and jump to the leader controller's URL.
Added a button to cancel interactive tasks.
Can close GUI even if a task is running.