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[Regression] No longer possible to disable CSV schema inference #19417

@sergiimk

Description

@sergiimk

Describe the bug

In DF v50 by setting CsvReadOptions::schema_infer_max_records to zero it was possible to disable schema inference completely, thus every column would be read as Utf8.

In DF v51 same setting results in all column types to be inferred as Null type.

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Expected behavior

It's often desirable to read all CSV columns as strings and then parse them in SQL later, so I think DF v50 behavior should be restored.

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