Module export_logical_tables 

Internal physical-table export into logical-table Parquet files.

Callers must authorize the captured tables and destination before invoking this component, and keep the source stable. Each destination must be owned exclusively by the export attempt. Completion and cleanup of closed files belong to the caller’s chunk protocol, not individual file completion.

Modules

writers 🔒

Structs

ActiveWriter 🔒

LogicalTableExport

Metadata captured for one physical table and its selected logical tables. Construct one unit per physical table, schema and time chunk. Capturing these references supplies no snapshot isolation or locking guarantee.

LogicalTableExportLimits

Export preprocessing and per-file limits. Query memory and spill remain governed by the query engine. Batch checks happen after allocation; flush thresholds are not hard RSS caps.

LogicalTableExportSummary

Counts returned only after every selected logical file has been closed.

LogicalTableProjection 🔒

Functions

check_cancelled 🔒

convert_slice_payload 🔒

estimate_batch_bytes_upper_bound 🔒

Estimates a conservative byte upper bound with bounded work on an async task. None means this path cannot estimate the batch, not that it exceeds a budget.

estimate_value_size 🔒

expand_bounded_slice 🔒

expand_export_array 🔒

expand_export_batch 🔒

Limits nested casts to selected children: Arrow’s List cast otherwise expands the entire values array, even when the parent has been sliced.

export_stream_managed 🔒

map_writer_error 🔒

rows_within_budget 🔒

write_tables 🔒