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Which issue does this PR close?
Closes #2837.
Rationale for this change
Map inputs to
explodeandposexplodecurrently fall back to Spark.What changes are included in this PR?
Support maps in all four explode variants by sharing their entry buffers with the existing unnest path. Preserve field metadata, entry order and outer NULL rows. Add regression tests and update support documentation.
How are these changes tested?
18 Rust tests and 52 targeted tests on each of Spark 3.5.9 and 4.1.3 pass, covering native execution, NULL/empty maps, nested inputs, sliced arrays and batch boundaries. Fork CI passes across Spark profiles and the Spark 4.1 SQL suites.