Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19720#discussion_r150406296
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala
---
@@ -90,7 +86,12 @@ case class Coalesce(children: Seq[Expression]) extends
Expression {
}
}
"""
- }.mkString("\n"))
+ }
+
+ ev.copy(code = s"""
+ ${ev.isNull} = true;
+ ${ev.value} = ${ctx.defaultValue(dataType)};
+ ${ctx.splitExpressions(ctx.INPUT_ROW, evals)}""")
--- End diff --
`splitExpressions` puts expression codes in individual functions. Only if
those expressions's input is from a row object, we can do this. If their input
is from `currentVars`, the splitting doesn't work.
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