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Revert "Don't truncate database and user names in startup packets."

This reverts commit562bee0.We received a report from the field about this change in behavior,so it seems best to revert this commit and to add propermultibyte-aware truncation as a follow-up exercise.Fixes bug #18711.Reported-by: Adam RauchReviewed-by: Tom Lane, Bertrand Drouvot, Bruce Momjian, Thomas MunroDiscussion:https://postgr.es/m/18711-7503ee3e449d2c47%40postgresql.orgBackpatch-through: 17

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src/backend/tcop
- backend_startup.c

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`‎src/backend/tcop/backend_startup.c`

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Original file line number	Diff line number	Diff line change
`@@ -830,6 +830,15 @@ ProcessStartupPacket(Port *port, bool ssl_done, bool gss_done)`
`830`	`830`	`if (port->database_name==NULL\|\|port->database_name[0]=='\0')`
`831`	`831`	`port->database_name=pstrdup(port->user_name);`
`832`	`832`
	`833`	`+/*`
	`834`	`+ * Truncate given database and user names to length of a Postgres name.`
	`835`	`+ * This avoids lookup failures when overlength names are given.`
	`836`	`+ */`
	`837`	`+if (strlen(port->database_name) >=NAMEDATALEN)`
	`838`	`+port->database_name[NAMEDATALEN-1]='\0';`
	`839`	`+if (strlen(port->user_name) >=NAMEDATALEN)`
	`840`	`+port->user_name[NAMEDATALEN-1]='\0';`
	`841`	`+`
`833`	`842`	`if (am_walsender)`
`834`	`843`	`MyBackendType=B_WAL_SENDER;`
`835`	`844`	`else`

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Commita0ff56e

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`‎src/backend/tcop/backend_startup.c`

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