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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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Sotirios Kougiouris updated SPARK-57421:
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Priority: Minor (was: Major)
> 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
> Priority: Minor
>
> 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("delta").table("name@vN")
> spark.read.format("delta").table("name@<ts>")
> {code}
> parse into the same plan as the existing {{VERSION AS OF}} / {{TIMESTAMP AS
> OF}} and {{option("versionAsOf")}} / {{option("timestampAsOf")}} clauses.
> 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}} at parse time.
> * New conf {{spark.sql.timeTravel.atSyntax.enabled}} (default true) to gate
> it.
> * Conflicts (e.g. "@" together with {{AS OF}}) raise error.
> h2. Notes
> * Behavior is opt-out via the conf.
> * Backquoted identifiers like {{`name@v1`}} remain literal table names.
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