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From "Aihua Xu (JIRA)" <>
Subject [jira] [Commented] (HIVE-9500) Support nested structs over 24 levels.
Date Wed, 28 Jan 2015 22:11:34 GMT


Aihua Xu commented on HIVE-9500:

+[~brocknoland] I'm planning to add a configuration to set the maximum number of levels. As
HIVE-3253 described, it controls the how many separators can be used in a nested field. To
be backward compatible, the existing logic will be there, by default to be 8, and if extend_nesting_levels
is set, the default is 24. Now if max_nesting_levels is set (with range 24 - 128), we will
use byte [0x80, 0xFF] for the additional separators.

> Support nested structs over 24 levels.
> --------------------------------------
>                 Key: HIVE-9500
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Aihua Xu
>              Labels: SerDe
> Currently we support up to 24 levels of nested structs when hive.serialization.extend.nesting.levels
is set to true, while the customers have the requirement to support more than that. 
> It would be better to make the supported levels configurable or completely removed (i.e.,
we can support any number of levels). 

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