vertica加密数据

通过创建 Secure Access Policies可以对vertica中的某一列数据进行加密：

CREATE ACCESS POLICY ON [schema][tablename]
FOR COLUMN columnname
expression
[ENABLE/DISABLE];

例如：

CREATE ACCESS POLICY ON customers_table
FOR COLUMN SSN
CASE
WHEN ENABLED_ROLE('manager') THEN SSN
WHEN ENABLED_ROLE('operator') THEN SUBSTR(SSN, 8, 4)
ELSE NULL
END
ENABLE;

ALTER ACCESS POLICY
ALTER ACCESS POLICY ON tablename

.. .FOR COLUMN columnname
... expression
... [ENABLE | DISABLE];
... | FOR COLUMN columname
...   COPY TO tablename;

DROP ACCESS POLICY
DROP ACCESS POLICY ON tablename
FOR COLUMN columnname;

如果表中存在策略的话，那么drop table 时会报错：

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