pgsql: Fix handling of NULLs returned by aggregate combine functions.

Fix handling of NULLs returned by aggregate combine functions.

When strict aggregate combine functions, used in multi-stage/parallel
aggregation, returned NULL, we didn't check for that, invoking the
combine function with NULL the next round, despite it being strict.

The equivalent code invoking normal transition functions has a check
for that situation, which did not get copied in a7de3dc5c346. Fix the
bug by adding the equivalent check.

Based on a quick look I could not find any strict combine functions in
core actually returning NULL, and it doesn't seem very likely external
users have done so. So this isn't likely to have caused issues in
practice.

Add tests verifying transition / combine functions returning NULL is
tested.

Reported-By: Andres Freund
Author: Andres Freund
Discussion: https://postgr.es/m/20171121033642.7xvmjqrl4jdaaat3@alap3.anarazel.de
Backpatch: 9.6, where parallel aggregation was introduced

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/c60b898453f9b4d7de94c8e88bf08e930d117958

Modified Files
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src/backend/executor/nodeAgg.c           | 11 +++++
src/test/regress/expected/aggregates.out | 71 ++++++++++++++++++++++++++++++++
src/test/regress/sql/aggregates.sql      | 63 ++++++++++++++++++++++++++++
3 files changed, 145 insertions(+)