[GitHub] [spark] EnricoMi commented on a diff in pull request #39556: [SPARK-42049][SQL] Improve AliasAwareOutputExpression

[GitBox <gi...@apache.org>]

EnricoMi commented on code in PR #39556:
URL: https://github.com/apache/spark/pull/39556#discussion_r1070900791


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -435,6 +435,15 @@ object SQLConf {
     .booleanConf
     .createWithDefault(true)
 
+  val EXPRESSION_PROJECTION_CANDIDATE_LIMIT =
+    buildConf("spark.sql.optimizer.expressionProjectionCandidateLimit")
+      .doc("The maximum number of the candidate of out put expressions whose alias are replaced." +
+        " It can preserve the output partitioning and ordering." +
+        " Negative value means disable this optimization.")

Review Comment:
   ```suggestion
         .doc("The maximum number of candidates for output expressions whose aliases are replaced." +
           " This can preserve the output partitioning and ordering." +
           " A negative value means to disable this optimization.")
   ```



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