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https://issues.apache.org/jira/browse/ARROW-8221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche updated ARROW-8221:
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Description:
ARROW-8058 added options related to schema inference / validation for the
Dataset factory. We should expose this in Python in the {{dataset(..)}} factory
function:
- Add ability to pass a user-specified schema with a {{schema}} keyword,
instead of inferring the schema from (one of) the files (to be passed to the
factory finish method)
- Add {{validate_schema}} option to toggle whether the schema is validated
against the actual files or not.
- Expose in some way the number of fragments to be inspected when inferring or
validating the schema. Not sure yet what the best API for this would be.
Some relevant notes from the original PR:
https://github.com/apache/arrow/pull/6687#issuecomment-604394407
was:
ARROW-8058 added options related to schema inference / validation for the
Dataset factory. We should expose this in Python in the {{dataset(..)}} factory
function:
- Add ability to pass a user-specified schema with a {{schema}} keyword,
instead of inferring the schema from (one of) the files (to be passed to the
factory finish method)
- Add {{validate_schema}} option to toggle whether the schema is validated
against the actual files or not.
- Expose in some way the number of fragments to be inspected when inferring or
validating the schema. Not sure yet what the best API for this would be.
> [Python][Dataset] Expose schema inference / validation options in the factory
> -----------------------------------------------------------------------------
>
> Key: ARROW-8221
> URL: https://issues.apache.org/jira/browse/ARROW-8221
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Joris Van den Bossche
> Assignee: Joris Van den Bossche
> Priority: Major
> Labels: dataset, pull-request-available
> Fix For: 3.0.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> ARROW-8058 added options related to schema inference / validation for the
> Dataset factory. We should expose this in Python in the {{dataset(..)}}
> factory function:
> - Add ability to pass a user-specified schema with a {{schema}} keyword,
> instead of inferring the schema from (one of) the files (to be passed to the
> factory finish method)
> - Add {{validate_schema}} option to toggle whether the schema is validated
> against the actual files or not.
> - Expose in some way the number of fragments to be inspected when inferring
> or validating the schema. Not sure yet what the best API for this would be.
> Some relevant notes from the original PR:
> https://github.com/apache/arrow/pull/6687#issuecomment-604394407
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