[[["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 document provides reference documentation for the `DataMaskingPolicy.Types.PredefinedExpression` enum within the BigQuery Data Policy v1 API, detailing various masking rules for data."],["The available fields include `AlwaysNull`, `DateYearMask`, `DefaultMaskingValue`, `EmailMask`, `FirstFourCharacters`, `LastFourCharacters`, `Sha256`, and `Unspecified`, each with specific behaviors for masking different data types."],["The `DateYearMask` will only show the year of `Date`, `DateTime` and `TimeStamp`, truncating according to the UTC time zone, while `DefaultMaskingValue` replaces data with default values based on the type, like empty string for strings, or 0 for integers."],["Email addresses masked with the `EmailMask` will have their username replaced with XXXXX, if valid, and use a SHA-256 hash if the syntax is invalid."],["`FirstFourCharacters` and `LastFourCharacters` will show the first or last four characters of text if the text length is greater than four, and will apply a SHA-256 hash if the text length is less than or equal to four characters."]]],[]]