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This function closely mirror its relation and attribute counterparts, but for extended statistics (i.e. CREATE STATISTICS) objects, being able to restore extended statistics for an extended stats object. Like the other functions, the goal of this feature is to ease the dump or upgrade of clusters so as ANALYZE would not be required anymore after these operations, stats being directly loaded into the target cluster without any post-dump/upgrade computation. The caller of this function needs the following arguments for the extended stats to restore: - The name of the relation. - The schema name of the relation. - The name of the extended stats object. - The schema name of the extended stats object. - If the stats are inherited or not. - One or more extended stats kind with its data. This commit adds only support for the restore of the extended statistics kind "n_distinct", building the basic infrastructure for the restore of more extended statistics kinds in follow-up commits, including MVC and dependencies. The support for "n_distinct" is eased in this commit thanks to the previous work done particularly in commits1f927cce44and44eba8f06e, that have added the input function for the type pg_ndistinct, used as data type in input of this new restore function. Bump catalog version. Author: Corey Huinker <corey.huinker@gmail.com> Co-authored-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/CADkLM=dpz3KFnqP-dgJ-zvRvtjsa8UZv8wDAQdqho=qN3kX0Zg@mail.gmail.com