refactor(query): improve aggregate bitmap and aggregate function state

[zhang2014]

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Summary

refactor(query): improve aggregate bitmap and aggregate function state

Tests

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Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve state when batch input has no valid bitmaps

The new batch path removes the current aggregate value with state.rb.take() before checking whether the entire chunk is null, and then exits early on validity.null_count() == view.len(). In multi-block aggregation, an all-null later block will therefore erase the bitmap accumulated from earlier blocks, yielding an incorrect final bitmap_or result. Make the all-null check happen before taking state.rb (or restore it before returning) so null-only chunks remain no-ops.

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