Github user heary-cao commented on the issue:
https://github.com/apache/spark/pull/21931
@maropu, The test results show that we can make a configuration parameter
for the capacity of fast hash. Currently capacity of our fast hash is related
to the length of the recorded data. so I'm not sure how much the default value
is configured, but it is unreasonable to configure it in CodeGen as a fixed
value(int capacity = 1 << 16;).
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