Short patch to expose a function GetCurrentTransactionWALVolume() that
gives the total number of bytes written to WAL by current transaction.
User interface to this information discussed on separate thread, so
that we don't check the baby out with the bathwater when people
discuss UI pros and cons.
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Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
