andygrove commented on code in PR #1491:
URL: https://github.com/apache/datafusion-comet/pull/1491#discussion_r1989890732


##########
spark/src/test/scala/org/apache/spark/sql/comet/CometPlanStabilitySuite.scala:
##########
@@ -278,7 +278,6 @@ trait CometPlanStabilitySuite extends 
DisableAdaptiveExecutionSuite with TPCDSBa
       CometConf.COMET_SHUFFLE_FALLBACK_TO_COLUMNAR.key -> "true",
       CometConf.COMET_EXEC_SORT_MERGE_JOIN_WITH_JOIN_FILTER_ENABLED.key -> 
"true",
       CometConf.COMET_CAST_ALLOW_INCOMPATIBLE.key -> "true", // needed for 
v1.4/q9, v1.4/q44, v2.7.0/q6, v2.7.0/q64
-      "spark.sql.readSideCharPadding" -> "false",

Review Comment:
   My guess is that at some point we fell back to Spark because we could not 
handle expressions such as `staticinvoke(class 
org.apache.spark.sql.catalyst.util.CharVarcharCodegenUtils, StringType, 
readSidePadding, cd_education_status#25, 20, true, false, true) AS 
cd_education_status#33,`



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