b4e3dc7fd4
Commit a271a1b50e introduced decoding at prepare time in ReorderBuffer. This can lead to deadlock for out-of-core logical replication solutions that uses this feature to build distributed 2PC in case such transactions lock [user] catalog tables exclusively. They need to inform users to not have locks on catalog tables (via explicit LOCK command) in such transactions. Reported-by: Andres Freund Discussion: https://postgr.es/m/20210222222847.tpnb6eg3yiykzpky@alap3.anarazel.de