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https://issues.apache.org/jira/browse/SPARK-57421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gengliang Wang resolved SPARK-57421.
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Fix Version/s: 4.3.0
Resolution: Fixed
Issue resolved by pull request 56481
[https://github.com/apache/spark/pull/56481]
> [WIP] Support @-syntax version and timestamp time travel on table name
> ----------------------------------------------------------------------
>
> Key: SPARK-57421
> URL: https://issues.apache.org/jira/browse/SPARK-57421
> Project: Spark
> Issue Type: New Feature
> Components: Connect, SQL
> Affects Versions: 5.0.0
> Reporter: Sotirios Kougiouris
> Assignee: Sotirios Kougiouris
> Priority: Minor
> Labels: pull-request-available
> Fix For: 4.3.0
>
>
> h2. What
> Add the {{@}} time travel shorthand on table names so that
> {code:sql}
> SELECT * FROM name@vN
> SELECT * FROM name@<TS>
> {code}
> and
> {code:java}
> spark.read.format("format").table("name@vN")
> spark.read.format("format").table("name@<ts>")
> {code}
> parse into the same plan as the existing {{VERSION AS OF}} / {{TIMESTAMP AS
> OF}} and {{option("versionAsOf")}} / {{option("timestampAsOf")}} syntaxes.
> Support for SQL, the classic DataFrame reader, and Spark Connect.
> h2. Why
> Spark already supports {{VERSION AS OF}} / {{TIMESTAMP AS OF}} and the
> {{{}versionAsOf{}}}/{{{}timestampAsOf{}}} reader options, but not the compact
> {{@}} suffix. Resolving it at parse time also simplifies the time travel
> entry points pipeline.
> h2. Proposed change
> * Lexer/grammar: add {{@}}-suffix on table identifiers.
> * AstBuilder converts the suffix into {{RelationTimeTravel}}.
> * New flag {{spark.sql.timeTravel.atSyntax.enabled}} (default {{true}}) to
> allow or disallow.
> h2. Notes
> * Backquoted identifiers like {{`name@v1`}} remain literal table names.
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