[FLINK-15123] remove uniqueKeys from FlinkStatistic in blink planner - ASF JIRA

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Details

Type: Technical Debt
Status: Open
Priority: Not a Priority
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: Table SQL / Planner
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Description

uniqueKeys is a kind of constraint, it's unreasonable that uniqueKeys is a kind of statistic. so we should remove uniqueKeys from FlinkStatistic in blink planner. Some temporary solutions (e.g. RichTableSourceQueryOperation) should also be resolved after primaryKey is introduced in TableSchema