[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-21 UTC."],[[["This page provides documentation for the `DataMaskingPolicy.Types.PredefinedExpression` enum within the BigQuery Data Policy v1 API, detailing various data masking options."],["The available masking rules include `AlwaysNull`, `DateYearMask`, `DefaultMaskingValue`, `EmailMask`, `FirstFourCharacters`, `LastFourCharacters`, `Sha256`, and `Unspecified`, each with specific behaviors for different data types."],["`DateYearMask` shows only the year for `Date`, `DateTime`, and `TimeStamp` data types, while `DefaultMaskingValue` replaces data with predefined defaults like \"\" for strings and 0 for integers."],["`EmailMask` redacts valid email usernames to XXXXX, while invalid email syntax is replaced using a SHA-256 hash; `FirstFourCharacters` and `LastFourCharacters` retain only the first or last four text characters respectively, while `Sha256` is used for text fields with less than four characters."],["The `Unspecified` field signifies that no masking occurs since no predefined expression has been set."]]],[]]