Github user scwf commented on a diff in the pull request:
https://github.com/apache/spark/pull/4425#discussion_r24557748
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -69,6 +69,7 @@ class Analyzer(catalog: Catalog,
typeCoercionRules ++
extendedRules : _*),
Batch("Check Analysis", Once,
+ CheckCast ::
--- End diff --
If we check resolution first,
1 check cast will be invalid since legitimate cast expression must be not
resolved.
2 ```select cast(key as binary) from src``` will give a
```scala.NotImplementedError```
how about not change the order but catch exception of child.dataType to
make it pass this rule?
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