【Flink SQL】维表优化规则建议

[张韩]

版本：1.12
问题：维表关联若是支持事件时间，维表需要有主键和时间属性，在满足这两个条件前提下，自定义维表若是实现LookupTableSource接口则优化会报异常：
Caused by: org.apache.calcite.plan.RelOptPlanner$CannotPlanException: There are not enough rules to produce a node with desired properties: convention=STREAM_PHYSICAL, FlinkRelDistributionTraitDef=any, MiniBatchIntervalTraitDef=None: 0, ModifyKindSetTraitDef=[NONE], UpdateKindTraitDef=[NONE].
Missing conversion is FlinkLogicalTableSourceScan[convention: LOGICAL -> STREAM_PHYSICAL]
建议：LookupTableSource的维表关联需是系统时间，在优化规则LogicalCorrelateToJoinFromTemporalTableRule中把这种限制信息提示出来是不是更好些