Expose arrow-schema methods, for use when writing parquet outside of ArrowWriter #6916
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Which issue does this PR close?
Addresses need noted here in Datafusion, by making two methods public.
Rationale for this change
When writing parquet with the ArrowWriter, the default behavior will encode the arrow schema in the parquet kv_metadata.
Other libraries may have their own parquet writers, such as Datafusion's ParquetSink, which will need to do the same operation in order to produce equivalent parquet (see DF issue).
What changes are included in this PR?
Make two existing methods public.
Are there any user-facing changes?
Exposes 2 existing methods.