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https://issues.apache.org/jira/browse/SPARK-48033?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-48033:
-----------------------------------
Assignee: Richard Chen
> Support Generated Column expressions that are `RuntimeReplaceable`
> ------------------------------------------------------------------
>
> Key: SPARK-48033
> URL: https://issues.apache.org/jira/browse/SPARK-48033
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 4.0.0
> Reporter: Richard Chen
> Assignee: Richard Chen
> Priority: Major
> Labels: pull-request-available
>
> Currently, default columns that have a default of a `RuntimeReplaceable`
> expression fails.
> This is because the `AlterTableCommand` constant folds before replacing
> expressions with the actual implementation. For example:
> ```
> sql(s"CREATE TABLE t(v VARIANT DEFAULT parse_json('1')) USING PARQUET")
> sql("INSERT INTO t VALUES(DEFAULT)")
> ```
> fails because `parse_json` is `RuntimeReplaceable` and is evaluated before
> the analyzer inserts the correct expression into the plan
> This is especially important for Variant types because literal variants are
> difficult to create - `parse_json` will likely be used the majority of the
> time.
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