Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19813#discussion_r156057427
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -1001,16 +1039,25 @@ class CodegenContext {
commonExprs.foreach { e =>
val expr = e.head
val fnName = freshName("evalExpr")
- val isNull = s"${fnName}IsNull"
+ val isNull = if (expr.nullable) {
+ s"${fnName}IsNull"
+ } else {
+ ""
+ }
val value = s"${fnName}Value"
// Generate the code for this expression tree and wrap it in a
function.
val eval = expr.genCode(this)
+ val nullValue = if (expr.nullable) {
--- End diff --
nit: `assignIsNull`
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