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From "Wenchen Fan (JIRA)" <>
Subject [jira] [Resolved] (SPARK-26744) Support schema validation in File Source V2
Date Sat, 16 Feb 2019 09:22:00 GMT


Wenchen Fan resolved SPARK-26744.
       Resolution: Fixed
    Fix Version/s: 3.0.0

Issue resolved by pull request 23714

> Support schema validation in File Source V2
> -------------------------------------------
>                 Key: SPARK-26744
>                 URL:
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Gengliang Wang
>            Assignee: Gengliang Wang
>            Priority: Major
>             Fix For: 3.0.0
> The internal API supportDataType in FileFormat validates the output/input schema before
task execution starts. So that we can avoid launching read/write tasks which would fail. Also,
users can see clean error messages.
> This PR is to implement the same internal API in the FileDataSourceV2 framework. Comparing
to FileFormat, FileDataSourceV2 has multiple layers. The API is added in two places:
> 1. Read path: the table schema is determined in TableProvider.getTable. The actual read
schema can be a subset of the table schema. This PR proposes to validate the actual read schema
in FileScan.
> 2. Write path: validate the actual output schema in FileWriteBuilder.

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