Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/18972#discussion_r133879240
--- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -789,6 +789,36 @@ class CodegenContext {
}
/**
+ * Wrap the generated code of expression by a function. ev,isNull and ev.value are
passed
+ * by global variables
--- End diff --
Not arbitrary codes all can be wrapped by this. The codes must be only created from a
row object. We should note this in the comment.
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