[jira] [Updated] (SPARK-57843) Support nanosecond-precision timestamps in streaming stateful operators

["Max Gekk (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-57843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Max Gekk updated SPARK-57843:
-----------------------------
    Shepherd: Max Gekk

> Support nanosecond-precision timestamps in streaming stateful operators
> -----------------------------------------------------------------------
>
>                 Key: SPARK-57843
>                 URL: https://issues.apache.org/jira/browse/SPARK-57843
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Structured Streaming
>    Affects Versions: 4.3.0
>            Reporter: Max Gekk
>            Priority: Major
>
> This sub-task is part of the umbrella SPARK-56822 (timestamps with nanosecond precision).
> h2. Problem
> Streaming stateful operators assume microsecond {{Long}} event times: {{StreamingSymmetricHashJoinExec}} (~L747, ~L980-984) uses {{getLong}} and {{watermarkMs * 1000}}; {{StreamingSessionWindowStateManager}} (~L135) hard-codes {{TimestampType}} in the state key schema; {{SymmetricHashJoinStateManager}} reads event times via {{getLong}}. The {{RocksDBStateEncoder}} is schema-generic, but the operators above are not.
> h2. Goal
> Allow nanosecond event-time columns to flow through stream-stream join eviction and session-window state, preserving nanosecond resolution in state keys and eviction comparisons.
> h2. Scope
> Update the state schema and eviction/read paths in the listed operators to handle {{TimestampNanosVal}}.
> h2. Acceptance criteria
> * Stream-stream joins and session windows keyed on / bounded by nanosecond event time evict and emit correctly.
> h2. Testing
> {{StreamingJoinSuite}}, {{StreamingSessionWindowSuite}}.
> h2. Dependencies
> Do AFTER SPARK-57830 (event-time watermark on nanosecond columns) and SPARK-57829 (window/session_window over nanosecond timestamps).



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