On Thu, Oct 27, 2016 at 2:11 AM, amul sul <sula...@gmail.com> wrote:
> selectDumpableExtension() function skip
> s dump of
> built-in extensions in case of binary-upgrade  only,
> why not in normal
> dump
> ?
> Can't we assume those will already be installed in the target database
> at restore
> ?

There's a comment in dumpExtension() that explains it.

         * In a regular dump, we use IF NOT EXISTS so that there isn't a
         * problem if the extension already exists in the target database;
         * this is essential for installed-by-default extensions such as
         * plpgsql.
         * In binary-upgrade mode, that doesn't work well, so instead we skip
         * built-in extensions based on their OIDs; see
         * selectDumpableExtension.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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