[HIVE-5380] Non-default OI constructors should be supported for backwards compatibility

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.13.0
• Fix Version/s: 0.13.0

Release Note

Apache Hive recommends that custom ObjectInspectors created for use with custom Serdes have a no-argument constructor in addition to their normal constructors for serialization purposes. See HIVE-5380 for more details.

• Assignee: Brock Noland
• Reporter: Brock Noland
• Created: 27/Sep/13 05:02
• Updated: 25/Feb/14 08:46
• Resolved: 07/Feb/14 21:55

Description

In HIVE-5263 we started serializing OI's when cloning the plan. This was a great boost in speed for many queries. In the future we'd like to stop copying the OI's, perhaps in HIVE-4396.

Until then Custom Serdes will not work on trunk. This is a fix to allow custom serdes such as the Hive JSon Serde work until we address the fact we don't want to have to copy the OI's. Since this is modifying the byte code, we should recommend that the no-arg constructor be added.

Issue Links

• is related to: HIVE-6043 Document incompatible changes in Hive 0.12 and trunk
• relates to: HIVE-4396 Create a efficient method to create a deep copy of a mapredwork
• relates to: HIVE-5263 Query Plan cloning time could be improved by using Kryo