feat: Add provisions for storing and inheriting time zone information in relational objects

[krlmlr]

No description provided.

[Copilot]

Pull Request Overview

This PR implements a new feature to support storing and inheriting time zone information in relational objects. Key changes include:

• Updating external relation creation functions in both src/reltoaltrep.cpp and src/relational.cpp to pass an additional time zone parameter.
• Modifying existing API calls to include parent relation pointers and a new default time zone value.
• Enhancing the RelationWrapper in src/include/rapi.hpp with new constructors and a tzone member for improved time zone propagation.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/reltoaltrep.cpp	Updated external relation creation to include a parent relation pointer for time zone inheritance.
src/relational.cpp	Added a default tzone parameter and updated various relation functions to propagate time zone details.
src/include/rapi.hpp	Extended RelationWrapper with overloads that accept explicit and inherited time zone values.

Comments suppressed due to low confidence (3)

src/relational.cpp:155

• [nitpick] Consider adding test cases to verify that the default time zone value is correctly propagated across the updated relation functions.

std::string tzone = "";

src/include/rapi.hpp:137

• [nitpick] Consider renaming 'rel_orig_1' and 'rel_orig_2' to more descriptive names (e.g., 'primary_relation' and 'secondary_relation') to clarify their roles in time zone inheritance.

RelationWrapper(duckdb::shared_ptr<Relation> rel_p, const cpp11::external_pointer<RelationWrapper>& rel_orig_1, const cpp11::external_pointer<RelationWrapper>& rel_orig_2) : rel(std::move(rel_p)) {

src/reltoaltrep.cpp:513

• [nitpick] If 'wrapper->rel_eptr' represents an original relation wrapper for time zone propagation, consider renaming it to better reflect its role.

return make_external<RelationWrapper>("duckdb_relation", rel, wrapper->rel_eptr);