Low and High Confidentiality

Explain What are Low and High Confidentiality in Explain command.

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The explain generally displays the plan which would be prepared by Optimizer.
We can say that(though not accurate), plan would be the steps followed by Teradata to solve a query.
Confidence levels indicate how well the optimizer is aware about the  demographic data for a particular step.
High confidence: Means the optimizer know about the no of rows that would be returned as a result of that step. Examples would be, when  PI statistics exist, when the column or range stats exist or no join involved.
Low confidence: Some stats available. Join and stats available on both sides of the join.
No confidence: No stats available. Join involved.   

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