Add pgstatginindex() function to get the size of the GIN pending list.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 357cbaaeae5bc1f385828be97345e7ea24235f92
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2012-12-05T07:58:03Z
Releases: 9.3.0
Add pgstatginindex() function to get the size of the GIN pending list.

Fujii Masao, reviewed by Kyotaro Horiguchi.

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