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[FLINK-7603] [table] Support WITHIN clause in MATCH_RECOGNIZE
Introduces support for WITHIN clause in MATCH_RECOGNIZE that allows adding a time constraint for a pattern. It reuses the within function of Pattern in the CEP library. The behavior is such that the difference between first row in a match and last row in a match must be smaller than the given period. The WITHIN clause accepts only a constant millisecond interval value.
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