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https://issues.apache.org/jira/browse/SPARK-36642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weichen Xu reassigned SPARK-36642:
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Assignee: Liang Zhang
> Add df.withMetadata: a syntax suger to update the metadata of a dataframe
> -------------------------------------------------------------------------
>
> Key: SPARK-36642
> URL: https://issues.apache.org/jira/browse/SPARK-36642
> Project: Spark
> Issue Type: Story
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Liang Zhang
> Assignee: Liang Zhang
> Priority: Major
>
> To make it easy to use/modify the semantic annotation, we want to have a
> shorter API to update the metadata in a dataframe.
> Currently we have
> {code:scala}
> df.withColumn("col1", col("col1").alias("col1", metadata=metadata))
> {code}
> to update the metadata without changing the column name, and this is too
> verbose. We want to have a syntax suger API
> {code:scala}
> df.withMetadata("col1", metadata=metadata)
> {code}
> to achieve the same functionality.
> A bit of background for the frequency of the metadata update: We are working
> on inferring the semantic data types and use them in AutoML and store the
> semantic annotation in the metadata. So in many cases, we will suggest the
> user update the metadata to correct the wrong inference or manually add the
> annotation for weak inference.
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