[auto-merge] bot-auto-merge-release/26.08 to main [skip ci] [bot]

[nvauto]

auto-merge triggered by github actions on bot-auto-merge-release/26.08 to create a PR keeping main up-to-date. If this PR is unable to be merged due to conflicts, it will remain open until manually fix.

[nvauto]

SUCCESS - auto-merge

[greptile-apps]

Greptile Summary

The PR updates the main branch from the 26.08 release line, advances the cuDF dependency pins, and extends ORC timezone compatibility.

• Adds GPU support for Apache ORC convertFromUtc semantics.
• Introduces a same-rules fast path and terminal-offset sentinel handling for writer/reader timezone conversion.
• Improves DST-rule extraction for TimeZone implementations with unreliable daylight-use flags.
• Expands timezone conversion, boundary, slice, fixed-offset, and failure-path tests.
• Advances cuDF, rapids-cmake, KvikIO, and RMM pins toward the 26.10 development line.

Confidence Score: 5/5

The PR appears safe to merge; no concrete changed-code defect remains after checking the new timezone conversion paths and coordinated dependency pins.

The Java, JNI, and CUDA interfaces remain aligned, transition and DST lookup behavior matches the CPU reference semantics for supported timestamps, and the new tests exercise the relevant boundaries and optimized paths.

Important Files Changed

Filename	Overview
src/main/java/com/nvidia/spark/rapids/jni/GpuTimeZoneDB.java	Adds ORC from-UTC APIs, context metadata, same-rules detection, and terminal transition sentinels with matching JNI parameters.
src/main/cpp/src/timezones.cu	Implements the from-UTC CUDA conversion and optimizes equal-rule writer/reader conversion while preserving slice and null handling.
src/main/cpp/src/GpuTimeZoneDBJni.cpp	Extends the JNI writer/reader signature and adds the native bridge for ORC from-UTC conversion.
src/main/java/com/nvidia/spark/rapids/jni/OrcDstRuleExtractor.java	Probes actual timezone offsets before trusting useDaylightTime() and derives savings from observed transitions when necessary.
src/test/java/com/nvidia/spark/rapids/jni/GpuTimeZoneDBTest.java	Adds broad coverage for fixed offsets, transition boundaries, sliced columns, nulls, invalid types, closed contexts, and from-UTC conversion.
thirdparty/cudf-pins/versions.json	Advances KvikIO and RMM dependency pins from 26.08 to 26.10 in coordination with the cuDF submodule update.

Sequence Diagram

sequenceDiagram
  participant Caller as Java caller
  participant Context as OrcTimezoneContext
  participant JNI as GpuTimeZoneDBJni
  participant GPU as CUDA timezone kernel
  Caller->>Context: Build writer/reader timezone metadata
  Context->>JNI: Convert timestamps with tables, offsets, and DST rules
  alt Writer and reader rules match
    JNI->>GPU: Apply ORC base adjustment only
  else Rules differ
    JNI->>GPU: Apply transition and recurring-DST lookup
  end
  GPU-->>Caller: TIMESTAMP_MICROSECONDS column

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