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Posted to issues@paimon.apache.org by "lszskye (via GitHub)" <gi...@apache.org> on 2026/06/23 08:04:16 UTC

[PR] feat: implement TableRead and FallbackDataSplit [paimon-cpp]

lszskye opened a new pull request, #111:
URL: https://github.com/apache/paimon-cpp/pull/111

   ## Implement TableRead and FallbackDataSplit for Table Source Module
   
   ### Summary
   
   Add the implementation of `TableRead` and introduce `FallbackDataSplit` to support reading data from Paimon tables, including fallback branch reading capabilities.
   
   ### New Classes
   
   **`TableRead` (table_read.cpp)** — The core entry point for reading data from a Paimon table. `TableRead::Create` constructs the appropriate table reader based on the `ReadContext`:
   - Resolves the table schema from the schema manager or from a user-provided specific schema.
   - Merges user options with table schema options.
   - Dispatches to `AppendOnlyTableRead` for append-only tables or `KeyValueTableRead` for primary-key tables.
   - Supports fallback branch reading: when `scan-fallback-branch` is configured, creates a `FallbackTableRead` that wraps both the primary and fallback branch readers.
   - Supports system table reading by detecting and delegating to the appropriate `SystemTable` implementation.
   - `CreateReader` concatenates readers from multiple splits into a single `ConcatBatchReader`.
   
   **`FallbackDataSplit`** — A decorator over `DataSplit` that marks whether a split originates from the fallback branch. Wraps an existing `DataSplit` and exposes `IsFallback()` to indicate its origin, enabling the read layer to apply branch-specific read logic.
   
   ### Tests
   
   - `data_split_test.cpp`
   - `fallback_data_split_test.cpp`
   - `table_read_test.cpp`


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Re: [PR] feat: implement TableRead and FallbackDataSplit [paimon-cpp]

Posted by "JingsongLi (via GitHub)" <gi...@apache.org>.
JingsongLi merged PR #111:
URL: https://github.com/apache/paimon-cpp/pull/111


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Re: [PR] feat: implement TableRead and FallbackDataSplit [paimon-cpp]

Posted by "lucasfang (via GitHub)" <gi...@apache.org>.
lucasfang commented on PR #111:
URL: https://github.com/apache/paimon-cpp/pull/111#issuecomment-4777050873

   +1


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