Although you cannot collect statistics on the payload JSON column, you can collect statistics on specific data in the payload column of the foreign table by using dot notation and specifying an alias for the column data.
This example collects statistics on the City data in the payload column of the foreign table s3_tbl. For the payload.City, the statement specifies the alias City.
COLLECT STATS COLUMN(payload.City) AS City ON s3_tbl;
Cast any columns referenced in this statement to reasonable data types to improve performance of COLLECT STATS.
You cannot collect statistics on a $PATH expression.