Jark Wu created FLINK-21899:
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Summary: Introduce SOURCE_WATERMARK built-infunction to preserve
watermark from source
Key: FLINK-21899
URL: https://issues.apache.org/jira/browse/FLINK-21899
Project: Flink
Issue Type: Sub-task
Components: Table SQL / API
Reporter: Jark Wu
The SOURCE_WATERMARK function doesn't have concrete implementation. The
{{eval()}} function should throw a meaningful exception message to indicate
users the function should only be used in DDL to generate a watermark preserved
from source system.
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