[INLONG-5613][Sort] Add interval join support for FlinkSqlParser #5614
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Title: [INLONG-5613][Sort] Add interval join support for FlinkSqlParser
(The following XYZ should be replaced by the actual GitHub Issue number)
Fixes #5613
Motivation
Support interval join for FlinkSqlParser.
Modifications
Related to protocol
1.Add AddFunction, BetweenFunction, SubtractFunction, IntervalFunction.
Related to sql parser
1.Add support interval join parse for FlinkSqlParser
Verifying this change
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This change is a trivial rework/code cleanup without any test coverage.
This change is already covered by existing tests, such as:
(please describe tests)
This change added tests and can be verified as follows:
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Documentation