Use ereport rather than elog in WinCheckAndInitializeNullTreatment.

Previously WinCheckAndInitializeNullTreatment() used elog() to emit an
error message. ereport() should be used instead because it's a
user-facing error. Also use existing get_func_name() to get a
function's name, rather than own implementation.

Moreover add an assertion to validate winobj parameter, just like
other window function API.

Reported-by: Tom Lane <[email protected]>
Author: Tatsuo Ishii <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: https://postgr.es/m/2952409.1760023154%40sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5f3808646f67260d5dc0d95f2602886da5cf5c52

Modified Files
--------------
src/backend/executor/nodeWindowAgg.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)

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