Github user uncleGen commented on the issue:
https://github.com/apache/spark/pull/17141
@srowen There are some unsupported `operator` for Structured Streaming. You
can view here:
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala#L184
This pr adds support for `sample` operator.
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