Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19797#discussion_r154074153
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/RegexpExpressionsSuite.scala
---
@@ -20,6 +20,7 @@ package org.apache.spark.sql.catalyst.expressions
import org.apache.spark.SparkFunSuite
import org.apache.spark.sql.AnalysisException
import org.apache.spark.sql.catalyst.dsl.expressions._
+import org.apache.spark.sql.catalyst.expressions.codegen.{CodeAndComment,
CodegenContext, CodeGenerator}
--- End diff --
`CodeAndComment` and `CodeGenerator` are not used.
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