Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19449#discussion_r143306861
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -929,7 +929,7 @@ class CodegenContext {
// be extremely expensive in certain cases, such as deeply-nested
expressions which operate over
// inputs with wide schemas. For more details on the performance
issues that motivated this
// flat, see SPARK-15680.
- if (SparkEnv.get != null &&
SparkEnv.get.conf.getBoolean("spark.sql.codegen.comments", false)) {
--- End diff --
`SQLConf` is based on the active spark session. The active spark session is
not always correctly set. Thus, we do not encourage the community to use
`SQLConf`.
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