[pgpool-committers: 669] pgpool: Fix long standing problem with do_query(). When 1) extended pro

[Tatsuo Ishii]

Fix long standing problem with do_query(). When 1) extended protocol
used and 2)unnamed portal is used and 3) no explicit transaction is
used, user's unnamed portal is removed by Sync message. This is
because Sync message closes transaction and unnamed portal is
removed. This leads to "portal "" does not exist" error.

Fix is, use "Flush" message instead of Sync. Main difference between
using Sync and Flush is, Flush does not return Ready for Query
message. So do_query() does not return until all expected responses
are returned. It seems the order of messages returned from backend is
random, and do_query() manages it by using state bits.

Branch
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V3_0_STABLE

Details
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http://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=82effaab1024088a0013a9aa78e037ecdb018a33

Modified Files
--------------
pool_process_query.c |   57 +++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 52 insertions(+), 5 deletions(-)