doc: \copy can get data values \. and end-of-input confused
Reported-by: Svante Richter Discussion: https://postgr.es/m/fcd57e4-8f23-4c3e-a5db-2571d09208e2@beta.fastmail.com Backpatch-through: 11
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@ -1076,6 +1076,10 @@ testdb=>
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destination, because all data must pass through the client/server
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connection. For large amounts of data the <acronym>SQL</acronym>
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command might be preferable.
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Also, because of this pass-through method, <literal>\copy
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... from</literal> in <acronym>CSV</acronym> mode will erroneously
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treat a <literal>\.</literal> data value alone on a line as an
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end-of-input marker.
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</para>
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</tip>
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@ -631,6 +631,7 @@ handleCopyIn(PGconn *conn, FILE *copystream, bool isbinary, PGresult **res)
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* This code erroneously assumes '\.' on a line alone
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* inside a quoted CSV string terminates the \copy.
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* http://www.postgresql.org/message-id/E1TdNVQ-0001ju-GO@wrigleys.postgresql.org
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* https://www.postgresql.org/message-id/bfcd57e4-8f23-4c3e-a5db-2571d09208e2@beta.fastmail.com
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*/
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if (strcmp(buf, "\\.\n") == 0 ||
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strcmp(buf, "\\.\r\n") == 0)
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