[hive] Strip newline characters from Glue column comments - #8918
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Closes #8917
What
Normalize Glue column comments by replacing newline characters with spaces before the 255-character length check. Short multiline comments now get sanitized instead of returning early with raw newlines.
Why
AWS Glue rejects column comments containing newline characters. The previous implementation only truncated long comments and skipped newline cleanup for short ones, which made short multiline comments fail validation.
Tests
The targeted Maven run passed.