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https://issues.apache.org/jira/browse/NIFI-8259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17291077#comment-17291077
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ASF subversion and git services commented on NIFI-8259:
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Commit 29cc3886fcdb5322162a12c531468a9415fee9ed in nifi's branch
refs/heads/main from Matt Burgess
[ https://gitbox.apache.org/repos/asf?p=nifi.git;h=29cc388 ]
NIFI-8259: Infer CSV field types as strings if no records are present
> CSVSchemaInference should infer fields as strings if no records are present
> ---------------------------------------------------------------------------
>
> Key: NIFI-8259
> URL: https://issues.apache.org/jira/browse/NIFI-8259
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Reporter: Matt Burgess
> Assignee: Matt Burgess
> Priority: Major
> Fix For: 1.14.0, 1.13.1
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Even though the field names may be present in a flow file whose schema is to
> be inferred by CSVReader, if there are no records in the flow file the data
> types of the fields cannot be ascertained. This causes the schema to be empty
> and can result in unwanted behavior in processors such as QueryRecord and
> ConvertRecord.
> Instead the schema inference should assume all fields are of string types,
> such that a "best-effort" schema is generated for use by the processors.
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