wuyi created SPARK-31750:
----------------------------
Summary: Eliminate UpCast if chid'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
{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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