JingsongLi opened a new pull request, #10345:
URL: https://github.com/apache/paimon/pull/10345

   ### Purpose
   
   Allow Flink and Spark to build composite BTree global indexes for Data 
Evolution tables through `sys.create_global_index` with an ordered, 
comma-separated column list.
   
   This follows the storage and equality-query support merged in #10338 and 
#10339.
   
   - Pass every key column to the index scanner, writer and indexer.
   - Construct typed tuple keys in both engines and preserve key order during 
sorting.
   - Keep independently configured single-column indexes and composite 
definitions separate.
   - Add integration coverage for nullable components, reader/eager equality 
queries, incremental builds, updates to either component, unchanged rebuilds 
and precise index removal.
   - Document the current full-key equality contract and build lifecycle.
   
   Python support remains deferred. Prefix, range and IN query optimization 
will follow separately.
   
   ### Tests
   
   All scoped tests pass without the `fast-build` profile:
   
   | Profile | Runtime | Scope | Result |
   | --- | --- | --- | --- |
   | Flink 1 | JDK 8 | Composite/single BTree, Bitmap, MultiValue integration 
tests; topology and procedure unit tests | 15 passed |
   | Flink 2 | JDK 11 | Same Flink scope after rebuilding the common module | 
15 passed |
   | Spark 3 | JDK 8 / Scala 2.12 | Composite and existing create-index 
procedure suites; topology and procedure Java unit tests | 9 Scala + 15 Java 
passed |
   | Spark 4 | JDK 17 / Scala 2.13 | Same Spark scope after a clean dependency 
build | 9 Scala + 15 Java passed |
   
   Checkstyle, Spotless, Maven Enforcer, Apache RAT and `git diff --check` also 
pass.
   


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