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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
`@@ -805,6 +805,15 @@ ProcessStartupPacket(Port *port, bool ssl_done, bool gss_done)`
`805`	`805`	`if (port->database_name==NULL\|\|port->database_name[0]=='\0')`
`806`	`806`	`port->database_name=pstrdup(port->user_name);`
`807`	`807`
	`808`	`+/*`
	`809`	`+ * Truncate given database and user names to length of a Postgres name.`
	`810`	`+ * This avoids lookup failures when overlength names are given.`
	`811`	`+ */`
	`812`	`+if (strlen(port->database_name) >=NAMEDATALEN)`
	`813`	`+port->database_name[NAMEDATALEN-1]='\0';`
	`814`	`+if (strlen(port->user_name) >=NAMEDATALEN)`
	`815`	`+port->user_name[NAMEDATALEN-1]='\0';`
	`816`	`+`
`808`	`817`	`if (am_walsender)`
`809`	`818`	`MyBackendType=B_WAL_SENDER;`
`810`	`819`	`else`

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Commitd09fbf6

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`‎src/backend/tcop/backend_startup.c`

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