[python] fix rest file io and blob-as-descriptor file io token merge issue and add rest catalog blob-as-descriptor sample #7009
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Purpose
When using REST catalog with blob-as-descriptor, we have two FileIO instances:
RESTTokenFileIO updates catalog_options dynamically in _initialize_oss_fs() when refreshing token. This would pollute the blob reader's configuration. So try to use a copy of catalog options in uri_reader_factory.
Java: Token updates in RESTTokenFileIO.fileIO() create a new Options object.
Tests
API and Format
Documentation