raunaqmorarka opened a new pull request, #216:
URL: https://github.com/apache/parquet-format/pull/216
### Jira
- https://issues.apache.org/jira/browse/PARQUET-2352
This updates the spec to allow truncation of row group min_values/max_value
statistics so that readers can take advantage of row group pruning for
predicates on columns containing long strings.
https://issues.apache.org/jira/browse/PARQUET-1685 already introduced a
feature to parquet-mr which allows users to deviate from the current spec and
configure truncation of row group statistics.
Since the possibility of truncation exists and is not possible to explicitly
detect, attempts to pushdown min/max aggregation to parquet have avoided
implementing it for string columns (e.g.
https://issues.apache.org/jira/browse/SPARK-36645)
Given the above situation, the spec should be updated to allow truncation of
min/max row group stats. This would align the spec with current reality that
string column min/max row group stats could be truncated.
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