Github user bogdanrdc commented on a diff in the pull request:
https://github.com/apache/spark/pull/16608#discussion_r96300006
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
---
@@ -233,11 +244,11 @@ abstract class ExplodeBase extends UnaryExpression
with CollectionGenerator with
if (position) {
new StructType()
.add("pos", IntegerType, nullable = false)
- .add("key", kt, nullable = false)
+ .add("key", kt, nullable = true)
--- End diff --
I will see if I can fix it from Generate instead.
If it's false then outer_explode with empty map fails with this exception:
java.util.concurrent.ExecutionException: java.lang.Exception: failed to
compile: org.codehaus.commons.compiler.CompileException: File 'generated.java',
Line 42, Column 89: A method named "isNullAt" is not declared in any enclosing
class nor any supertype, nor through a static import
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