Gabor Kaszab created IMPALA-9494:
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Summary: Support displaying complex types
Key: IMPALA-9494
URL: https://issues.apache.org/jira/browse/IMPALA-9494
Project: IMPALA
Issue Type: Epic
Components: Backend, Frontend
Reporter: Gabor Kaszab
Assignee: Gabor Kaszab
Currently displaying complex types is not supported in Impala. There is a
workaround to see the unnested content of the collections but there is no such
functionality to display one complex type in one result column formatted to
Json. Note, Hive does have support for the same.
The scope of this Jira is to have an umbrella for the following tasks:
- Support all complex types (Struct, Array, Map) in the SELECT list and display
them as Json.
- Display complex type columns in Json for a "SELECT *" query
- Allow returning complex types in a sub-select
- Have the display support for Parquet and ORC
Note, I made the sub-tasks as small as possible so that this granularity allows
to parallelise the work.
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