Hi all,
It seems that description of index_size that is returned by pgstatindex() is wrong.
The document says "Total number of pages in index".
But it looks like the number of bytes is stored in index_size.
The document page:
http://www.postgresql.org/docs/9.5/interactive/pgstattuple.html
Regards,
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OTSUKA Kenji
otsuka(dot)kenji(at)nttcom(dot)co(dot)jp