estimate_size

Catalog.estimate_size()

Estimate size of catalog.

The result includes an upper-bound on the number of rows, and a range of expected sizes for the data in memory and on disk.

This method should be used to estimate the size of a single catalog when using column selection and spatial filtering. If the catalog is modified further (especially involving other catalogs, e.g. joining or crossmatching), the results will be innacurate.

The results are for RAW data, and they do not represent a full size footprint, as the estimates provided by the catalog’s parquet metadata only account for the size of parquet data pages.