Date: Sat, 2 Dec 2023 15:53:20 -0600
From: Nathan Bossart <nathandbossart@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Joe Conway <mail@joeconway.com>, Davin Shearer <davin@apache.org>,
	PostgreSQL-development <pgsql-hackers@postgreSQL.org>
Subject: Re: Emitting JSON to file using COPY TO
Message-ID: <20231202215320.GA1855278@nathanxps13>
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On Sat, Dec 02, 2023 at 10:11:20AM -0500, Tom Lane wrote:
> So if you are writing a production that might need to match
> FORMAT followed by JSON, you need to match FORMAT_LA too.

Thanks for the pointer.  That does seem to be the culprit.

diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index d631ac89a9..048494dd07 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -3490,6 +3490,10 @@ copy_generic_opt_elem:
                 {
                     $$ = makeDefElem($1, $2, @1);
                 }
+            | FORMAT_LA copy_generic_opt_arg
+                {
+                    $$ = makeDefElem("format", $2, @1);
+                }
         ;
 
 copy_generic_opt_arg:

-- 
Nathan Bossart
Amazon Web Services: https://aws.amazon.com