Add new binary comparison operators IS NOT DISTINCT FROM and IS DISTINCT FROM
+ that are equivalent to IS and IS NOT, respective, for compatibility with
+ PostgreSQL and SQL standards.
+
Add a new return code (value "3") from the sqlite3_vtab_distinct()
+ interface that indicates a query that has both DISTINCT and ORDER BY
+ clauses.
+
The unix os interface resolves all symbolic links in database
+ filenames to create a canonical name for the database before the
+ file is opened.
+ If the SQLITE_OPEN_NOFOLLOW flag is used with sqlite3_open_v2()
+ or similar, the open will fail if any element of the path is a
+ symbolic link.
+
Defer materializing views until the materialization
+ is actually needed, thus avoiding unnecessary work if the materialization turns
+ out to never be used.
+