Re: Removing support for COPY FROM STDIN in protocol version 2

On 2021-Feb-03, Tom Lane wrote:

> I have a vague recollection that JDBC users still like to use
> protocol 2 for some reason --- is that out of date?

2016:

commit c3d8571e53cc5b702dae2f832b02c872ad44c3b7
Author:     Vladimir Sitnikov <sitnikov.vladimir@gmail.com>
AuthorDate: Sat Aug 6 12:22:17 2016 +0300
CommitDate: Sat Aug 13 11:27:16 2016 +0300

    fix: support cases when user-provided queries have 'returning'
    
    This change includes: drop v2 protocol support, and query parsing refactoring.
    Currently query parse cache is still per-connection, however "returningColumNames"
    are part of cache key, thus the parse cache can be made global.
    
    This fixes #488 (see org.postgresql.test.jdbc3.GeneratedKeysTest)

This commit does remove all files in
pgjdbc/src/main/java/org/postgresql/core/v2/, leaving only "v3/".

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