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      Support to parse watermark syntax in SQL DDL. This can implemented in flink-sql-parser module.

      The watermark syntax is as following:

      WATERMARK FOR columnName AS <watermark_strategy_expression>

      We should also do some validation during parsing, for example, whether the referenced rowtime field exist. We should also support to reference a nested field as the rowtime field.

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              jark Jark Wu
              jark Jark Wu
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