cloud-fan commented on a change in pull request #32980:
URL: https://github.com/apache/spark/pull/32980#discussion_r655564938
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
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@@ -76,24 +76,32 @@ object ExprCode {
/**
* State used for subexpression elimination.
*
+ * @param code The sequence of statements required to evaluate the
subexpression.
* @param isNull A term that holds a boolean value representing whether the
expression evaluated
* to null.
* @param value A term for a value of a common sub-expression. Not valid if
`isNull`
* is set to `true`.
+ * @param childrenSubExprs The sequence of subexpressions as the children
expressions. Before
+ * evaluating this subexpression, we should evaluate
all children
+ * subexpressions first. This is used if we want to
selectively evaluate
+ * particular subexpressions, instead of all at once.
In the case, we need
+ * to make sure we evaluate all children
subexpressions too.
*/
-case class SubExprEliminationState(isNull: ExprValue, value: ExprValue)
+case class SubExprEliminationState(
Review comment:
Now this looks very similar to `ExprCode` with children tracked...
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