Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/18853#discussion_r131929813
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -354,6 +354,14 @@ object TypeCoercion {
p.makeCopy(Array(left, Cast(right, TimestampType)))
case p @ BinaryComparison(left, right)
+ if left.isInstanceOf[AttributeReference] &&
right.isInstanceOf[Literal] =>
+ p.makeCopy(Array(left, castExpr(right, left.dataType)))
--- End diff --
We need to cover all the same cases, but it seems this fix couldn't do, for
example;
```
scala> spark.udf.register("testUdf", () => "85908509832958239058032")
scala> sql("select * from values (1) where testUdf() > 1").explain
== Physical Plan ==
*Filter (cast(UDF:testUdf() as int) > 1)
+- LocalTableScan [col1#104]
```
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