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Fix calculation of latency of pgbench backslash commands.

When we loop back to the top of doCustom after processing a backslashcommand, we must reset the "now" timestamp, because that's used tocalculate the time spent executing the previous command.Report and fix by Fabien Coelho. Backpatch to 9.5, where this was broken.

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src/bin/pgbench
- pgbench.c

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`‎src/bin/pgbench/pgbench.c‎`

Lines changed: 3 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1135,11 +1135,12 @@ doCustom(TState thread, CState st, instr_time conn_time, FILE logfile, AggVa`
`1135`	`1135`	`* first time it's needed, and reuse the same value throughout this`
`1136`	`1136`	`* function after that. This also ensures that e.g. the calculated latency`
`1137`	`1137`	`* reported in the log file and in the totals are the same. Zero means`
`1138`		`- * "not set yet".`
	`1138`	`+ * "not set yet". Reset "now" when we step to the next command with "goto`
	`1139`	`+ * top", though.`
`1139`	`1140`	`*/`
	`1141`	`+top:`
`1140`	`1142`	`INSTR_TIME_SET_ZERO(now);`
`1141`	`1143`
`1142`		`-top:`
`1143`	`1144`	`commands=sql_files[st->use_file];`
`1144`	`1145`
`1145`	`1146`	`/*`

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Commit5515ec0

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`‎src/bin/pgbench/pgbench.c‎`

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