Fix crash when using CALL on an aggregate

Peter Eisentraut <peter_e@gmx.net>

Commit: 3d8874224ff25de3ca4f9da8ce3118391bd6609e
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-12-13T15:37:48Z
Releases: 11.0
Fix crash when using CALL on an aggregate

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

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