Github user arunmahadevan commented on the issue:
https://github.com/apache/spark/pull/21721
The CustomMetrics are traits which can be mixed in if necessary. (see
https://github.com/apache/spark/pull/21721#issuecomment-403878383) and does not
affect any other API as such. When query progress is supported for continuous
mode, changes can be made if necessary. I can further investigate on how to
report query progress for continuous mode.
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