The "[PRAGMA est_count][1]" command was an experimental design to help speed up ANALYZE for large (tera-byte sized) databases. The idea was subsequently folded into trunk. See the "[PRAGMA analyze_limit][2]" command. The table [size estimation logic][3] is in the source tree, but it is not accessible to application code at this time. [1]: https://www.sqlite.org/src/timeline?r=est_count_pragma [2]: https://www.sqlite.org/pragma.html#pragma_analysis_limit [3]: https://www.sqlite.org/src/info/4da25694985ac8f5?ln=5704-5727