space() with negative input causes native crash

[andygrove]

Description

Calling space(-1) (or any negative input) through Comet's native execution causes a crash with:

failed to round upto multiple of 64

Spark returns an empty string for space(-1).

Steps to Reproduce

CREATE TABLE test_space(n int) USING parquet;
INSERT INTO test_space VALUES (-1);
SELECT concat('[', space(n), ']') FROM test_space;

Expected Behavior

Should return [] (empty string padded), matching Spark behavior.

Actual Behavior

Native execution crashes with "failed to round upto multiple of 64".

🤖 Generated with Claude Code

[hsiang-c]

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