Overview of data filtering - AWS Lake Formation

Overview of data filtering

With the data filtering capabilities of Lake Formation, you can implement the following levels of data security.

Column-level security

Granting permissions on a Data Catalog table with column-level security (column filtering) allows users to view only specific columns that they have access to in the table. Consider a persons table that is used in multiple applications for a large multi-region communications company. Granting permissions on Data Catalog tables with column filtering can restrict users who don't work in the HR department from seeing personally identifiable information (PII) such as a social security number or birth date.

Row-level security

Granting permissions on a Data Catalog table with row-level security (row filtering) allows users to view only specific rows of data that they have access to in the table. The filtering is based on the values of one or more columns. For example, if different regional offices of the communications company have their own HR departments, you can limit the person records that HR employees can see to only records for employees in their region.

Cell-level security

Cell-level security combines row filtering and column filtering for a highly flexible permissions model. If you view the rows and columns of a table as a grid, by using cell-level security, you can restrict access to individual elements (cells) of the grid anywhere in the two dimensions. That is, you can restrict access to different columns depending on the row. This is illustrated by the following diagram, in which restricted columns are shaded.


        A grid is shown with 5 rows and 6 columns. The rows and columns have headers like
          Col1, Col2, Row1, Row2, and so on. The grid cells with the following coordinates are
          shaded: R3,C1; R3,C2; R3,C3; R5,C1; R5;C2; R5,C5; R5,C6.

Continuing the example of the persons table, you can create a data filter at the cell-level that restricts access to the street address column if the row has the country column set to "UK", but allows access to the street address column if the row has the country column set to "US".

Filters apply only to read operations. Therefore, you can grant only the SELECT Lake Formation permission with filters.