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https://issues.apache.org/jira/browse/SPARK-25037?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris O'Hara updated SPARK-25037:
---------------------------------
Summary: plan.transformAllExpressions doesn't transform expressions in
nested SubqueryExpression plans (was: plan.transformAllExpressions doesn't
transform expressions in subquery plans)
> plan.transformAllExpressions doesn't transform expressions in nested
> SubqueryExpression plans
> ---------------------------------------------------------------------------------------------
>
> Key: SPARK-25037
> URL: https://issues.apache.org/jira/browse/SPARK-25037
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Chris O'Hara
> Priority: Minor
>
> Given the following LogicalPlan, containing a SubqueryAlias and
> SubqueryExpression:
> {code:java}
> scala> val plan = spark.sql("SELECT 1 bar FROM (SELECT 1 foo) WHERE foo IN
> (SELECT 1 foo)").queryExecution.logical
> plan: org.apache.spark.sql.catalyst.plans.logical.LogicalPlan =
> 'Project [1 AS bar#29]
> +- 'Filter 'foo IN (list#31 [])
> : +- Project [1 AS foo#30]
> : +- OneRowRelation
> +- SubqueryAlias __auto_generated_subquery_name
> +- Project [1 AS foo#28]
> +- OneRowRelation
> {code}
> The following transformation should replace all instances of lit(1) with
> lit(2):
> {code:java}
> scala> plan.transformAllExpressions { case l @ Literal(1, _) => l.copy(value
> = 2) }
> res0: plan.type =
> 'Project [2 AS bar#29]
> +- 'Filter 'foo IN (list#31 [])
> : +- Project [1 AS foo#30]
> : +- OneRowRelation
> +- SubqueryAlias __auto_generated_subquery_name
> +- Project [2 AS foo#28]
> +- OneRowRelation
> {code}
> Instead, the nested SubqueryExpression plan is not transformed.
> The expected output is:
> {code:java}
> 'Project [2 AS bar#29]
> +- 'Filter 'foo IN (list#31 [])
> : +- Project [2 AS foo#30]
> : +- OneRowRelation
> +- SubqueryAlias __auto_generated_subquery_name
> +- Project [2 AS foo#28]
> +- OneRowRelation
> {code}
>
>
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