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Refactor script execution state machine in pgbench.
The doCustom() function had grown into quite a mess. Rewrite it, in a more explicit state machine style, for readability. This also fixes one minor bug: if a script consisted entirely of meta commands, doCustom() never returned to the caller, so progress reports with the -P option were not printed. I don't want to backpatch this refactoring, and the bug is quite insignificant, so only commit this to master, and leave the bug unfixed in back-branches. Review and original bug report by Fabien Coelho. Discussion: <alpine.DEB.2.20.1607090850120.3412@sto>
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