pgsql: Allow hash joins to be interrupted while searching hash table fo

Allow hash joins to be interrupted while searching hash table for match.

Per experimentation with a recent example, in which unreasonable amounts
of time could elapse before the backend would respond to a query-cancel.

This might be something to back-patch, but the patch doesn't apply cleanly
because this code was rewritten for 9.1. Given the lack of field
complaints I won't bother for now.

Cédric Villemain

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/0c99d41ec887051fb0cc6e35e358ecc936a13584

Modified Files
--------------
src/backend/executor/nodeHashjoin.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)