Chao Sun created HIVE-15056:
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Summary: Support index shifting for struct fields
Key: HIVE-15056
URL: https://issues.apache.org/jira/browse/HIVE-15056
Project: Hive
Issue Type: Sub-task
Components: File Formats, Physical Optimizer,
Serializers/Deserializers
Reporter: Chao Sun
Assignee: Chao Sun
In HIVE-13873, the following case doesn't work:
{code}
select s.c from tbl
{code}
where {{tbl}} is of schema:
{code}
a int
s struct<b:int,c:string>
{code}
This is because currently we generate a "pruned" schema (in terms of
{{GroupType}}) for Parquet reader to scan the data. However, on the Hive side
the object inspector still uses the original schema. In particular, in this
case for {{s.c}} the data returned by Parquet reader is in index 0, but the
object inspector tries to read it in index 1. Therefore, in correct result will
be returned.
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