Major Description
Example:
drop table if exists tbl1; create table tbl1 (a int, b int) using parquet; set spark.sql.codegen.wholeStage=false; set spark.sql.codegen.factoryMode=NO_CODEGEN; insert into tbl1 select id as a, id as b from range(1, 5);
This results in the following exception:
java.lang.ClassCastException: org.apache.spark.sql.catalyst.expressions.ExpressionProxy cannot be cast to org.apache.spark.sql.catalyst.expressions.Cast at org.apache.spark.sql.catalyst.expressions.CheckOverflowInTableInsert.withNewChildInternal(Cast.scala:2514) at org.apache.spark.sql.catalyst.expressions.CheckOverflowInTableInsert.withNewChildInternal(Cast.scala:2512)
The query produces 2 bigint values, but the table's schema expects 2 int values, so Spark wraps each output field with a Cast.
Later, in InterpretedUnsafeProjection, prepareExpressions tries to wrap the two Cast expressions with an ExpressionProxy. However, the parent expression of each Cast is a CheckOverflowInTableInsert expression, which does not accept ExpressionProxy as a child.
