processone
let extended queries handle empty responses
Some queries return empty data sets. In case extended query mechanism was used - whole process would be hung in a 'receive' with no results. This patch lets p1_pgsql handle such queries and return back to 'ready for query' state.
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You did it @oxpa!
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I've submitted a pull request to ejabberd to use this patch. But by the time I made it there was an alternative implementation using E'' syntax. I'm not really sure which approach is better because this uses anonymous prepared statement under the hood and I know to little about E'' escaping in postgres to make educated comparison.