Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20010#discussion_r158844162
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercionSuite.scala
---
@@ -389,6 +389,25 @@ class TypeCoercionSuite extends AnalysisTest {
widenTest(StringType, MapType(IntegerType, StringType, true), None)
widenTest(ArrayType(IntegerType), StructType(Seq()), None)
+ widenTest(
+ ArrayType(StringType, containsNull=true),
--- End diff --
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