Runyao.Chen created SPARK-42286:
-----------------------------------
Summary: Fix internal error for valid CASE WHEN expression with
CAST when inserting into a table
Key: SPARK-42286
URL: https://issues.apache.org/jira/browse/SPARK-42286
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 3.4.0
Reporter: Runyao.Chen
```
spark-sql> create or replace table es570639t1 as select x FROM values (1), (2),
(3) as tab(x);
spark-sql> create or replace table es570639t2 (x Decimal(9, 0));
spark-sql> insert into es570639t2 select 0 - (case when x = 1 then 1 else x
end) from es570639t1 where x = 1;
```
hits the following internal error
org.apache.spark.SparkException: [INTERNAL_ERROR] Child is not Cast or
ExpressionProxy of Cast
Stack trace:
org.apache.spark.SparkException: [INTERNAL_ERROR] Child is not Cast or
ExpressionProxy of Cast at
org.apache.spark.SparkException$.internalError(SparkException.scala:78) at
org.apache.spark.SparkException$.internalError(SparkException.scala:82) at
org.apache.spark.sql.catalyst.expressions.CheckOverflowInTableInsert.checkChild(Cast.scala:2693)
at
org.apache.spark.sql.catalyst.expressions.CheckOverflowInTableInsert.withNewChildInternal(Cast.scala:2697)
at
org.apache.spark.sql.catalyst.expressions.CheckOverflowInTableInsert.withNewChildInternal(Cast.scala:2683)
at
org.apache.spark.sql.catalyst.trees.UnaryLike.$anonfun$mapChildren$5(TreeNode.scala:1315)
at
org.apache.spark.sql.catalyst.trees.CurrentOrigin$.withOrigin(TreeNode.scala:106)
at
org.apache.spark.sql.catalyst.trees.UnaryLike.mapChildren(TreeNode.scala:1314)
at
org.apache.spark.sql.catalyst.trees.UnaryLike.mapChildren$(TreeNode.scala:1309)
at
org.apache.spark.sql.catalyst.expressions.UnaryExpression.mapChildren(Expression.scala:636)
at
org.apache.spark.sql.catalyst.trees.TreeNode.transformUpWithPruning(TreeNode.scala:570)
at
org.apache.spark.sql.catalyst.trees.TreeNode.$anonfun$transformUpWithPruning$1(TreeNode.scala:570)
This internal error comes from `CheckOverflowInTableInsert``checkChild`, where
we covered only `Cast` expr and `ExpressionProxy` expr, but not the `CaseWhen`
expr.
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