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https://issues.apache.org/jira/browse/SPARK-31750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17110367#comment-17110367
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Apache Spark commented on SPARK-31750:
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User 'Ngone51' has created a pull request for this issue:
https://github.com/apache/spark/pull/28572
> Eliminate UpCast if child's dataType is DecimalType
> ---------------------------------------------------
>
> Key: SPARK-31750
> URL: https://issues.apache.org/jira/browse/SPARK-31750
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: wuyi
> Priority: Major
>
>
> {code:java}
> sql("select cast(11111111111111111111111111111111111111 as decimal(38, 0)) as
> d")
> .write.mode("overwrite")
> .parquet(f.getAbsolutePath)
> spark.read.parquet(f.getAbsolutePath).as[BigDecimal]
> {code}
> {code:java}
> [info] org.apache.spark.sql.AnalysisException: Cannot up cast `d` from
> decimal(38,0) to decimal(38,18).
> [info] The type path of the target object is:
> [info] - root class: "scala.math.BigDecimal"
> [info] You can either add an explicit cast to the input data or choose a
> higher precision type of the field in the target object;
> [info] at
> org.apache.spark.sql.catalyst.analysis.Analyzer$ResolveUpCast$.org$apache$spark$sql$catalyst$analysis$Analyzer$ResolveUpCast$$fail(Analyzer.scala:3060)
> [info] at
> org.apache.spark.sql.catalyst.analysis.Analyzer$ResolveUpCast$$anonfun$apply$33$$anonfun$applyOrElse$174.applyOrElse(Analyzer.scala:3087)
> [info] at
> org.apache.spark.sql.catalyst.analysis.Analyzer$ResolveUpCast$$anonfun$apply$33$$anonfun$applyOrElse$174.applyOrElse(Analyzer.scala:3071)
> [info] at
> org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$transformDown$1(TreeNode.scala:309)
> [info] at
> org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:72)
> [info] at
> org.apache.spark.sql.catalyst.trees.TreeNode.transformDown(TreeNode.scala:309)
> [info] at
> org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$transformDown$3(TreeNode.scala:314)
> {code}
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