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Issue: #46424 test:add_collection_field(invalid_default_value) hybrid_search(NOT supported_ simplify some test cases using one single collection to save time. query with different time shift and timezone settings <!-- This is an auto-generated comment: release notes by coderabbit.ai --> - Core invariant: TIMESTAMPTZ values are treated as absolute instants (timezone-preserving). Tests assume conversions between stored instants and display timezones/time-shifts are deterministic and reversible; the PR validates queries/reads across different timezone and time-shift settings against that invariant. - Removed/simplified logic: duplicated per-test create/insert/teardown flows and several isolated timestamptz unit cases (edge_case, Feb_29, partial_update, standalone query) were consolidated into a module-scoped fixture that creates a single COLLECTION_NAME, inserts ROWS, and handles teardown. This removes redundant setup/teardown code and repeated scaffolding while preserving the same API exercise points (create_collection, insert, query, alter_collection_properties, alter_database_properties, describe_collection, describe_database). - No data loss or behavior regression: only test code was reorganized and new assertions exercise the same production APIs and code paths used previously (create_collection → insert → query / alter_properties → describe). The fixture inserts the same ROWS and tests still convert/compare timestamptz values via cf.convert_timestamptz and query check routines; the new invalid-default-value test only asserts error handling when adding a TIMESTAMPTZ field with an invalid default and does not mutate persisted data or change production logic. - PR type (Enhancement/Test): expands and reorganizes E2E test coverage for TIMESTAMPTZ—centralizes collection setup to reduce runtime and flakiness, adds explicit coverage for invalid-default-value behavior, and increases timezone/time-shift query scenarios without altering product behavior. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Signed-off-by: Eric Hou <eric.hou@zilliz.com> Co-authored-by: Eric Hou <eric.hou@zilliz.com>