feat(java): speed up zonemap reads#6906
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Replaces per-row JNI object construction with a single Arrow IPC byte stream returned across the JNI boundary, then decoded back to List<ZoneStats> in pure Java via the new ZonemapStatsCodec. The profiled hot path drops from O(N) JNI calls (one new_object + 3 method invocations per zone, plus per-value scalar_value_to_java) to O(1) — one byte[] crossing the boundary, regardless of zone count. Tests: - New ZonemapStatsCodecTest: 9 tests on synthetic IPC streams covering empty/null bytes, null-in-non-nullable across all id columns, date/ timestamp round-trip, and multi-batch ordering. - ZonemapStatsTest extended with 6 integration tests covering VARCHAR, FLOAT8, BIT, DATEDAY, non-TZ TIMESTAMP, and all-null zones (was IntVector-only). Change-Id: If0680e1be67c9c9323d7c6d34b8727f34a599068
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Replaces per-row JNI object construction with a single Arrow IPC byte stream returned across the JNI boundary, then decoded back to List in pure Java via the new ZonemapStatsCodec. The profiled hot path drops from O(N) JNI calls (one new_object + 3 method invocations per zone, plus per-value scalar_value_to_java) to O(1) — one byte[] crossing the boundary, regardless of zone count.
Tests: