Module feature_flags 

Feature flags

Constants

ENABLE_UNSTABLE_DATA_OVERLAY_FILES_ENV

Environment variable that opts a release build into reading and writing data overlay files before the feature is generally released.

FLAG_BASE_PATHS

Dataset uses multiple base paths (for shallow clones or multi-base datasets)

FLAG_DELETION_FILES

Fragments may contain deletion files, which record the tombstones of soft-deleted rows.

FLAG_DISABLE_TRANSACTION_FILE

Disable writing transaction file under _transaction/, this flag is set when we only want to write inline transaction in manifest

FLAG_STABLE_ROW_IDS

Row ids are stable for both moves and updates. Fragments contain an index mapping row ids to row addresses.

FLAG_TABLE_CONFIG

Table config is present

FLAG_UNKNOWN

The first bit that is unknown as a feature flag

FLAG_UNSTABLE_DATA_OVERLAY_FILES

Fragments contain data overlay files, which supply new values for a subset of cells without rewriting base data files. A reader that does not understand overlays must refuse the dataset, since ignoring an overlay would silently return stale base values.

FLAG_USE_V2_FORMAT_DEPRECATED

Files are written with the new v2 format (this flag is no longer used)

Functions

apply_feature_flags

Set the reader and writer feature flags in the manifest based on the contents of the manifest.

can_read_dataset

can_write_dataset

has_deprecated_v2_feature_flag