issue_comments: 1008157132

Running ANALYZE creates a new visible table called sqlite_stat1: https://www.sqlite.org/fileformat.html#the_sqlite_stat1_table

This should be added to the default list of hidden tables in Datasette.

It looks something like this:

| tbl | idx | stat | |---------------------------------|------------------------------------|-----------| | _counts | sqlite_autoindex__counts_1 | 5 1 | | global-power-plants_fts_config | global-power-plants_fts_config | 1 1 | | global-power-plants_fts_docsize | | 33643 | | global-power-plants_fts_idx | global-power-plants_fts_idx | 199 40 1 | | global-power-plants_fts_data | | 136 | | global-power-plants | "global-power-plants_owner" | 33643 4 | | global-power-plants | "global-power-plants_country_long" | 33643 202 |

In each such row, the sqlite_stat.stat column will be a string consisting of a list of integers followed by zero or more arguments. The first integer in this list is the approximate number of rows in the index. (The number of rows in the index is the same as the number of rows in the table, except for partial indexes.) The second integer is the approximate number of rows in the index that have the same value in the first column of the index. The third integer is the number number of rows in the index that have the same value for the first two columns. The N-th integer (for N>1) is the estimated average number of rows in the index which have the same value for the first N-1 columns. For a K-column index, there will be K+1 integers in the stat column. If the index is unique, then the last integer will be 1.