A precondition on a document, used for conditional operations.
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{ // Union field |
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Union field condition_type . The type of precondition. condition_type can be only one of the following: |
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exists |
When set to |
updateTime |
When set, the target document must exist and have been last updated at that time. Timestamp must be microsecond aligned. A timestamp in RFC3339 UTC "Zulu" format, with nanosecond resolution and up to nine fractional digits. Examples: |