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The previous patch simplified CREATE SCHEMA's behavior to "execute all subcommands in the order they are written". However, that's a bit too simple, as the spec clearly requires forward references in foreign key constraint clauses to work, see feature F311-01. (Most other SQL implementations seem to read more into the spec than that, but it's not clear that there's justification for more in the text, and this is the only case that doesn't introduce unresolvable issues.) We never implemented that before, but let's do so now. To fix it, transform FOREIGN KEY clauses into ALTER TABLE ... ADD FOREIGN KEY commands and append them to the end of the CREATE SCHEMA's subcommand list. This works because the foreign key constraints are independent and don't affect any other DDL that might be in CREATE SCHEMA. For simplicity, we do this for all FOREIGN KEY clauses even if they would have worked where they were. Author: Jian He <jian.universality@gmail.com> Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/1075425.1732993688@sss.pgh.pa.us |
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