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https://issues.apache.org/jira/browse/BEAM-7173?focusedWorklogId=237986&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-237986
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ASF GitHub Bot logged work on BEAM-7173:
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Author: ASF GitHub Bot
Created on: 06/May/19 18:23
Start Date: 06/May/19 18:23
Worklog Time Spent: 10m
Work Description: pabloem commented on issue #8473: [BEAM-7173] Avoiding
schema autodetection by default in WriteToBigQuery
URL: https://github.com/apache/beam/pull/8473#issuecomment-489723208
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Issue Time Tracking
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Worklog Id: (was: 237986)
Time Spent: 1h 20m (was: 1h 10m)
> Bigquery connector should not enable schema autodetection without a user
> explicitly instructing to do so.
> ----------------------------------------------------------------------------------------------------------
>
> Key: BEAM-7173
> URL: https://issues.apache.org/jira/browse/BEAM-7173
> Project: Beam
> Issue Type: Bug
> Components: io-python-gcp
> Reporter: Valentyn Tymofieiev
> Assignee: Pablo Estrada
> Priority: Major
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Currently BQ_FILE_LOADS insertion method enables schema autodetection:
> [https://github.com/apache/beam/blob/6567f1687d53e491b337ba94f521fa2e4af35e46/sdks/python/apache_beam/io/gcp/bigquery_tools.py#L340]
> It may be more user-friendly allow users to opt-in for schema autodetection
> in their pipelines across all use-cases for BQ connector. Schema
> autodetection is an approximation, and does not always work.
> For example, schema autodetection cannot infer whether a string data is
> binary bytes or textual string, and will always prefer the latter. If schema
> autodetection is enabled by default, users who need to write 'bytes' data
> will always have to specify a schema, even when writing to a table that was
> already created and has the schema. Otherwise autodetected schema will try to
> write 'string' entry into a 'bytes' field and the write will fail.
> Related discussion:
> [https://lists.apache.org/thread.html/1f9d9cb1bbbfca87d74e62ba8e58a15059ed6c20ab419002fcd3f8df@%3Cdev.beam.apache.org%3E]
>
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