[Bug]: BCP import memory leak with varchar(max)

[staticlibs]

What happened?

This issue is similar to #2455, there seems to be a leak in processing Partially Length-prefixed (PLP) incoming records. Memory is allocated in MessageContext, so it is released after BCP import finishes. Still can be a problem when importing large files.

Excessive memory usage can be shown using BCP import with a table like this:

create table tab1 (col1 varchar(max))
insert into tab1 values('foobar')
insert into tab1 values(null)
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
insert into tab1 select * from tab1
select count(*) from tab1
> 2097152

Will submit a PR.

Version

BABEL_3_X_DEV (Default)

Extension

babelfishpg_tds

Which flavor of Linux are you using when you see the bug?

Fedora

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct.

[rohit01010]

PR's are merged, closing this issue.