How does pg parse 'select '(1,2)''

From: jacktby jacktby <jacktby(at)gmail(dot)com>
To: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: How does pg parse 'select '(1,2)''
Date: 2023-08-05 13:46:33
Message-ID: CA01F48A-C420-4FE9-9A2C-B560C213B737@gmail.com
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I’m trying to add new grammar for my application. So I’m do research on gram.y.
I think it will make the '(1,2)' as " '(' a_expr ')' "; but I can’t find out something like
" a_expr ',' a_expr “, can you give me the details?

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