[jira] [Assigned] (SPARK-57421) [WIP] Support @-syntax version and timestamp time travel on table name

["Gengliang Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-57421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gengliang Wang reassigned SPARK-57421:
--------------------------------------

    Assignee: Sotirios Kougiouris

> [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
>
> 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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