zjw1111 commented on code in PR #222:
URL: https://github.com/apache/paimon-cpp/pull/222#discussion_r3842245326
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src/paimon/core/catalog/file_system_catalog.h:
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@@ -38,11 +39,17 @@ class FileSystem;
class Identifier;
class Logger;
-class FileSystemCatalog : public Catalog {
+class FileSystemCatalog : public Catalog, public FormatTableCatalog {
Review Comment:
Thanks for explaining the ABI concern. This double-inheritance capability
pattern still feels too implicit to us. `Catalog` already exposes
`GetFormatTable()`, while the actual override point lives on a separate
`FormatTableCatalog` and is discovered through `dynamic_cast`. Catalog
implementations therefore need to know about a second orthogonal base class,
and the extension point is not visible from the `Catalog` interface itself;
this also introduces an RTTI-based cross-cast.
We would prefer `LoadFormatTable()` (or a protected virtual hook used by
`GetFormatTable()`) to be a virtual function on `Catalog`, overridden directly
by `FileSystemCatalog` and `RestCatalog`, instead of introducing this parallel
interface. If ABI stability is the blocker, could we first clarify whether this
release actually guarantees binary compatibility? Otherwise, the explicit
virtual contract seems like the simpler and more conventional API.
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