Thread: pgsql: Fix a small memory leak in ExecReScanAgg() in the hashed

Log Message:
-----------
Fix a small memory leak in ExecReScanAgg() in the hashed aggregation case.
In the previous coding, the list of columns that needed to be hashed on
was allocated in the per-query context, but we reallocated every time
the Agg node was rescanned. Since this information doesn't change over
a rescan, just construct the list of columns once during ExecInitAgg().

Tags:
----
REL8_3_STABLE

Modified Files:
--------------
    pgsql/src/backend/executor:
        nodeAgg.c (r1.156 -> r1.156.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeAgg.c?r1=1.156&r2=1.156.2.1)