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From fhueske <...@git.apache.org>
Subject [GitHub] flink issue #3423: [FLINK-5768] [table] Apply new aggregation functions for ...
Date Wed, 01 Mar 2017 08:40:28 GMT
Github user fhueske commented on the issue:

    Hi @shaoxuan-wang, sorry. I missed your comment. If you haven't started reworking the
batch aggregations yet, I agree to do it later and just change the merging to smaller batches.

    So far, we always put an emphasis on robustness and tried to avoid memory issues as much
as possible. In batch, most of the JVM memory is maintained by Flink and not available for
regular user-function objects. So I'd suggest to be a bit conservative here and batch 16 rows.
We can also run a few benchmarks to check how much the parameter affects the performance.

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