Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19827#discussion_r153235678
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -781,15 +781,18 @@ class CodegenContext {
* beyond 1000kb, we declare a private, inner sub-class, and the
function is inlined to it
* instead, because classes have a constant pool limit of 65,536 named
values.
*
- * @param row the variable name of row that is used by expressions
+ * Note that we will extract the current inputs of this context and pass
them to the generated
+ * functions. The input is `INPUT_ROW` for normal codegen path, and
`currentVars` for whole
+ * stage codegen path. Whole stage codegen path is not supported yet.
+ *
* @param expressions the codes to evaluate expressions.
*/
- def splitExpressions(row: String, expressions: Seq[String]): String = {
- if (row == null || currentVars != null) {
- // Cannot split these expressions because they are not created from
a row object.
+ def splitExpressions(expressions: Seq[String]): String = {
--- End diff --
@kiszk We can add a middle-advanced version that still extracts input of
current context, but can specify extra parameters and method name.
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