# RLSPolicy
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A structure that describes a row-level security policy, including the columns its filter expression references and the filter expression itself.

## Contents
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 ** AttachmentColumns **   <a name="lakeformation-Type-RLSPolicy-AttachmentColumns"></a>
The list of columns that the filter expression references.  
Type: Array of [Column](API_Column.md) objects  
Required: No

 ** CatalogId **   <a name="lakeformation-Type-RLSPolicy-CatalogId"></a>
The identifier for the Data Catalog that contains the policy. By default, the account ID.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\t]*`   
Required: No

 ** FilterExpression **   <a name="lakeformation-Type-RLSPolicy-FilterExpression"></a>
The filter predicate, written in a SQL-like syntax, that determines which rows are returned to the principal.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 2048.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*`   
Required: No

 ** Name **   <a name="lakeformation-Type-RLSPolicy-Name"></a>
The name of the row-level security policy.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 255.  
Pattern: `[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\t]*`   
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\+\+](https://docs.aws.amazon.com/goto/SdkForCpp/lakeformation-2017-03-31/RLSPolicy) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/lakeformation-2017-03-31/RLSPolicy) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/lakeformation-2017-03-31/RLSPolicy)