kumarUjjawal opened a new pull request, #9687:
URL: https://github.com/apache/arrow-rs/pull/9687
# Which issue does this PR close?
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- Closes #9539.
# Rationale for this change
`StatisticsConverter::try_new` resolves columns through `parquet_column()`,
which only supports top-level non-nested columns. Because of that, callers that
already know the Parquet leaf index for a nested field cannot use
`StatisticsConverter` to read statistics for that field.
This blocks reading stats for fields inside structs.
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# What changes are included in this PR?
- add `StatisticsConverter::from_column_index(...)`
- keep `StatisticsConverter::try_new(...)` behavior unchanged
- update docs to explain when to use each constructor
- add a test that writes a struct column and reads statistics for each
child
field through the new API
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# Are these changes tested?
Yes
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# Are there any user-facing changes?
Yes.
This adds a new public constructor:
`StatisticsConverter::from_column_index(...)`
There are no breaking changes.
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