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## What changes were proposed in this pull request? Our Analyzer and Optimizer have multiple rules for `UnaryNode`. After making `EventTimeWatermark` extend `UnaryNode`, we do not need a special handling for `EventTimeWatermark`. ## How was this patch tested? The existing tests Author: gatorsmile <gatorsmile@gmail.com> Closes #19913 from gatorsmile/eventtimewatermark. |
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