stiga-huang a0f77680c5
IMPALA-10483: Support subqueries in Ranger masking policies ...
This patch adds support for using subqueries in Ranger masking policies,
i.e. column-masking/row-filtering policies. The subquery can reference
either the current table or other tables. However, masking policies on
these tables won't be applied recursively. This is consistent with Hive.
One motivation is to avoid infinitely masking if it references the same
table. Another motivation I think is to simplify the masking behavior,
so when the admin is setting a masking expression, it can be considered
as running in the admin's perspective (i.e. no masking).
Implementation
Before analyzing the query, the coordinator loads the metadata of all
possibly used tables into the query's StmtTableCache. Table masking
takes place after the analyzing phase. If the subquery filter introduces
any new tables, the analyzer will fail to resolve them since their
metadata is not loaded in the StmtTableCache. This patch modified the
StmtMetadataLoader to also load those tables introduced by masking
policies. So they can be resolved correctly.
Tests
- Add more complex tests in test_row_filtering
Change-Id: I254df9f684c95c660f402abd99ca12dded7e764f
Reviewed-on: http://gerrit.cloudera.org:8080/17185
Reviewed-by: Aman Sinha <amsinha@cloudera.com >
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com >
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com >
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