[T2] Wide column metadata improvemnts - Githubissues

apache / parquet-format

Apache Parquet Format

https://parquet.apache.org/

Apache License 2.0

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[T2] Wide column metadata improvemnts #253

Open alkis opened 5 months ago

alkis commented 5 months ago

Make ColumnMetaData.type optional
Make ColumnMetaData.path_in_schema optional
Add ColumnMetaData.schema_index. This is the ordinal in FileMetaData.schema this column corresponds to. This allows sparse representation of columns in a rowgroup.
Deprecate ColumnMetaData.encoding_stats and replace with ColumnMetaData.is_fully_dict_encoded.

ref Parquet Metadata evolution

Jira

[ ] My PR addresses the following Parquet Jira issues and references them in the PR title. For example, "PARQUET-1234: My Parquet PR"
- https://issues.apache.org/jira/browse/PARQUET-XXX
- In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.

Commits

[ ] My commits all reference Jira issues in their subject lines. In addition, my commits follow the guidelines from "How to write a good git commit message":
1. Subject is separated from body by a blank line
2. Subject is limited to 50 characters (not including Jira issue reference)
3. Subject does not end with a period
4. Subject uses the imperative mood ("add", not "adding")
5. Body wraps at 72 characters
6. Body explains "what" and "why", not "how"

Documentation

[ ] In case of new functionality, my PR adds documentation that describes how to use it.
- All the public functions and the classes in the PR contain Javadoc that explain what it does