Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/3110#issuecomment-62103775
Hi @chenghao-intel,
I tried to add the method to `PreInsertionCasts` but it didn't work because
the `LogicalPlan` was not resolved which also checks if the child and table
types are the same.
Instead I tried to make `Cast` be able to handle complex types in #3150.
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