The values for Stat are:

tables

Total number of answer tries

answers

Total number of answers in the combined tries

duplicate_ratio

Ratio of generated (and thus ignored) duplicate answers. 1 means no duplicates. 2 means for every answer there was (on everage) a duplicate generated.

space_ratio

Number of nodes with a value divided by the total number of nodes in a trie. The maximum is 1. A low number implies that a large amount of differently shaped data is included in the answer tries.

complete_call

Number of times answers are generated from a completed table, i.e., times answers are reused.

invalidated

Number of times an incremental table was invalidated.

reevaluated

Number of times an invalidated table wa reevaluated. If lower than invalidated this implies that dependent nodes of the IDG were reevaluated to the same answer set.

space

Summed memory usage of the answer tries in bytes.

compiled_space

Summed size for the compiled representation of completed tables.