Benoit Hanotte created PARQUET-1216:
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Summary: Parquet protobuf: List wrapper should be optional
Key: PARQUET-1216
URL: https://issues.apache.org/jira/browse/PARQUET-1216
Project: Parquet
Issue Type: Bug
Components: parquet-mr
Affects Versions: 1.9.0
Reporter: Benoit Hanotte
Following [https://github.com/apache/parquet-mr/pull/411] , parquet-protobuf
will conform to the specs[1] regarding the definition of lists and will adopt
the 3-level structure:
{code:java}
*required* group my_list (LIST) {
repeated group list {
optional binary element (UTF8);
}
}{code}
The first level has the repetition level *required*, however this won't allow
making the distinction between a null list and an empty one.
This ticket is for changing the root level repetition to *optional* as
following:
{code:java}
*optional* group my_list (LIST) {
repeated group list {
optional binary element (UTF8);
}
}
{code}
This will allow differentiating between null and empty lists.
[1] https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#lists
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