v.23.1Improvement

Improve CSV Reading in CustomSeparated/Template Format

Official CH changelog text
Improve reading CSV field in CustomSeparated/Template format. Closes #42352 Closes #39620. #43332 (Kruglov Pavel).
Improved parsing of CSV fields when using CustomSeparated and Template formats in ClickHouse.

Why it matters

This enhancement addresses issues with reading CSV fields in CustomSeparated and Template formats, ensuring more accurate and reliable data import. It resolves related bugs (#42352 and #39620), providing users with better CSV data handling and minimizing parsing errors.

How to use it

Users benefit from this improvement automatically when reading CSV data with the CustomSeparated or Template input formats. No additional configuration is required; simply use these formats as before to experience more robust CSV field parsing.

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