Github user cloud-fan commented on a diff in the pull request:
    --- Diff: 
    @@ -252,6 +251,8 @@ case class PreprocessTableInsertion(conf: SQLConf) 
extends Rule[LogicalPlan] {
             if (expected.dataType.sameType(actual.dataType) && 
== {
             } else {
    +          // Renaming is needed for handling the INSERT statement like
    +          // INSERT INTO TABLE tab1 SELECT 1, 2
               Alias(Cast(actual, expected.dataType),
    --- End diff --
    What if we copy the metadata during alias? Does it work too?

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