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Improve dblink error message when remote does not provide it

When dblink or postgres_fdw detects an error on the remote side of theconnection, it will try to construct a local error message as best itcan using libpq's PQresultErrorField(). When no primary message isavailable, it was bailing out with an unhelpful "unknown error". Makethat message better and more style guide compliant. Per discussionon hackers.Backpatch to 9.2 except postgres_fdw which didn't exist before 9.3.Discussion:https://postgr.es/m/19872.1482338965%40sss.pgh.pa.us

1 parenta57695d commit3272be3Copy full SHA for 3272be3

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2 files changed

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contrib
- dblink
  - dblink.c
- postgres_fdw
  - connection.c

2 files changed

-2

lines changed

`‎contrib/dblink/dblink.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -2710,7 +2710,7 @@ dblink_res_error(const char conname, PGresult res, const char *dblink_context_`
`2710`	`2710`	`ereport(level,`
`2711`	`2711`	`(errcode(sqlstate),`
`2712`	`2712`	`message_primary ?errmsg_internal("%s",message_primary) :`
`2713`		`-errmsg("unknown error"),`
	`2713`	`+errmsg("could not obtain message string for remote error"),`
`2714`	`2714`	`message_detail ?errdetail_internal("%s",message_detail) :0,`
`2715`	`2715`	`message_hint ?errhint("%s",message_hint) :0,`
`2716`	`2716`	`message_context ?errcontext("%s",message_context) :0,`

`‎contrib/postgres_fdw/connection.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -496,7 +496,7 @@ pgfdw_report_error(int elevel, PGresult res, PGconn conn,`
`496`	`496`	`ereport(elevel,`
`497`	`497`	`(errcode(sqlstate),`
`498`	`498`	`message_primary ?errmsg_internal("%s",message_primary) :`
`499`		`-errmsg("unknown error"),`
	`499`	`+errmsg("could not obtain message string for remote error"),`
`500`	`500`	`message_detail ?errdetail_internal("%s",message_detail) :0,`
`501`	`501`	`message_hint ?errhint("%s",message_hint) :0,`
`502`	`502`	`message_context ?errcontext("%s",message_context) :0,`

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Commit3272be3

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2 files changed

2 files changed

`‎contrib/dblink/dblink.c`

`‎contrib/postgres_fdw/connection.c`

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