[WIP] read identify columns from iceberg metada#2067
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Signed-off-by: Konstantin Morozov <just.morozov.k@gmail.com>
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Changelog category (leave one):
Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Optimize reads filtered on Iceberg identity-partition columns by avoiding reading data files and using the need_only_count fast path.
Documentation entry for user-facing changes
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