From 9fcdf2c787ac6da330165ea3cd50ec5155943a2b Mon Sep 17 00:00:00 2001
From: Michael Paquier
Date: Tue, 11 Oct 2022 11:45:52 +0900
Subject: Add support for COPY TO callback functions

This is useful as a way for extensions to process COPY TO rows in the
way they see fit (say auditing, analytics, backend, etc.) without the
need to invoke an external process running as the OS user running the
backend through PROGRAM that requires superuser rights.  COPY FROM
already provides a similar callback for logical replication.  For COPY
TO, the callback is triggered when we are ready to send a row in
CopySendEndOfRow(), which is the same code path as when sending a row
to a frontend or a pipe/file.

A small test module, test_copy_callbacks, is added to provide some
coverage for this facility.

Author: Bilva Sanaba, Nathan Bossart
Discussion: https://postgr.es/m/253C21D1-FCEB-41D9-A2AF-E6517015B7D7@amazon.com
---
 src/backend/commands/copy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/backend/commands/copy.c')

diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index 49924e476af..db4c9dbc231 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -310,7 +310,7 @@ DoCopy(ParseState *pstate, const CopyStmt *stmt,
 
 		cstate = BeginCopyTo(pstate, rel, query, relid,
 							 stmt->filename, stmt->is_program,
-							 stmt->attlist, stmt->options);
+							 NULL, stmt->attlist, stmt->options);
 		*processed = DoCopyTo(cstate);	/* copy from database to file */
 		EndCopyTo(cstate);
 	}
-- 
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