[jira] [Created] (IMPALA-9329) Table masking view should not have nested columns in select list

["Quanlong Huang (Jira)" <ji...@apache.org>]

Quanlong Huang created IMPALA-9329:
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             Summary: Table masking view should not have nested columns in select list
                 Key: IMPALA-9329
                 URL: https://issues.apache.org/jira/browse/IMPALA-9329
             Project: IMPALA
          Issue Type: Bug
          Components: Security
            Reporter: Quanlong Huang
            Assignee: Quanlong Huang


If a table contains nested columns and column masking policies on some primitive columns, we should not add the nested columns in the table masking view.

To be specific, let's say table complextypestbl (id bigint, int_arr array<int>) has column masking policy on id: "id => id * 100". We will translate the AST of the following query
{code:sql}
select t.id from complextypestbl t;
{code}
to the AST of the following query
{code:sql}
select t.id from (
  select cast(id * 100 as BIGINT) as id,
    cast(int_array as ArrayType) as int_array
  from complextypestbl) t;
{code}
This causes a ParseError since we can't use ArrayType explicitly.
{code:sql}
ERROR: ParseException: Syntax error in line 1:
SELECT CAST(int_array AS org.apache.impala.catalog.Ar...
                         ^
Encountered: IDENTIFIER
Expected: ARRAY, BIGINT, BINARY, BOOLEAN, CHAR, DATE, DATETIME, DECIMAL, REAL, FLOAT, INTEGER, MAP, SMALLINT, STRING, STRUCT, TIMESTAMP, TINYINT, VARCHAR

CAUSED BY: Exception: Syntax error
{code}
On the other hand, we don't support nested types in select list. So we should remove the redundant column for 'int_array' in the table masking view.



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