[jira] [Created] (IMPALA-9597) Deduplicate Ranger audits when a column is referenced multiple times

["Fang-Yu Rao (Jira)" <ji...@apache.org>]

Fang-Yu Rao created IMPALA-9597:
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             Summary: Deduplicate Ranger audits when a column is referenced multiple times
                 Key: IMPALA-9597
                 URL: https://issues.apache.org/jira/browse/IMPALA-9597
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
            Reporter: Fang-Yu Rao
            Assignee: Fang-Yu Rao


After [IMPALA-9350|https://issues.apache.org/jira/browse/IMPALA-9350], Impala is able to produce the corresponding Ranger audits when a query involves policies of column masking. However, duplicate audit events will be produced if a column is referenced multiple times in a query.

For instance, since the following query would result in 2 calls to {{SelectStmt#analyze()}} on the same table, given that there is a column masking policy for the column of {{string_col}}, we will see 2 duplicate audit events for this column.
{noformat}
with iv as (select id, bool_col, string_col from functional.alltypestiny)
select * from iv;
{noformat}

We should thus deduplicate the audits in the case described above.




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