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ducklake_file_column_stats

This table contains column-level statistics for a single data file.

Column name Column type  
data_file_id BIGINT  
table_id BIGINT  
column_id BIGINT  
column_size_bytes BIGINT  
value_count BIGINT  
null_count BIGINT  
min_value VARCHAR  
max_value VARCHAR  
contains_nan BOOLEAN  
extra_stats VARCHAR  
  • data_file_id refers to a data_file_id from the ducklake_data_file table.
  • table_id refers to a table_id from the ducklake_table table.
  • column_id refers to a column_id from the ducklake_column table.
  • column_size_bytes is the byte size of the column.
  • value_count is the number of values in the column. This does not have to correspond to the number of records in the file for nested types.
  • null_count is the number of values in the column that are NULL.
  • min_value contains the minimum value for the column, encoded as a string. This does not have to be exact but has to be a lower bound. The value has to be cast to the actual type for accurate comparison, e.g., on integer types.
  • max_value contains the maximum value for the column, encoded as a string. This does not have to be exact but has to be an upper bound. The value has to be cast to the actual type for accurate comparison, e.g., on integer types.
  • contains_nan is a flag whether the column contains any NaN values. This is only relevant for floating-point types.
  • extra_stats contains different statistics from specific types such as geometry types.