pgsql: Fix crash when using CALL on an aggregate

Fix crash when using CALL on an aggregate

Author: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
Reported-by: Rushabh Lathia <rushabh.lathia@gmail.com>

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/3d8874224ff25de3ca4f9da8ce3118391bd6609e

Modified Files
--------------
src/backend/parser/parse_func.c | 9 +++++++++
src/test/regress/expected/create_procedure.out | 9 +++++++++
src/test/regress/sql/create_procedure.sql | 3 +++
3 files changed, 21 insertions(+)