JSON UDTF function
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Key: HIVE-1528
URL: https://issues.apache.org/jira/browse/HIVE-1528
Project: Hadoop Hive
Issue Type: New Feature
Reporter: Ning Zhang
Currently the only way to evaluate a path expression on a JSON object is
through get_json_object. If there are many fields in the JSON object need to be
extract, we have to call this UDF multiple times.
There are many use cases that get_json_object needs to be called many times in
one query to convert the JSON object to a relational schema. It would be much
desirable if we have a JSON UDTF that supports the following syntax:
{code}
select a.id, b.*
from a lateral view json_table(a.json_object, '$.f1', '$.f2', ..., '$.fn') b
as f1, f2, ..., fn
{code}
where the json_table function only scans the json_object once and return a set
of tuple of (f1, f2,..., fn).
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