Commit 6bbaa31

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Rearrange dblink's dblink_build_sql_insert() and related routines to open and

lock the target relation just once per SQL function call. The original coding obtained and released lock several times per call. Aside from saving a not-insignificant number of cycles, this eliminates possible race conditions if someone tries to modify the relation's schema concurrently. Also centralize locking and permission-checking logic. Problem noted while investigating a trouble report from Robert Voinea --- his problem is still to be fixed, though.

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contrib/dblink
- dblink.c

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