[format] Preserve csv values matching the configured null literal - #9492

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ArnavBalyan:arnavb/fix-n-csv

ArnavBalyan commented Aug 31, 2026

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Purpose

CSV converter matches a null literal into a real null value.
The writer writes null and non null values identically, so the reader cannot distinguish them.
Write matching strings as quoted values and treat only unquoted null values as null.

Tests

UT


          update

c03e006

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