tshauck commented on code in PR #449:
URL: https://github.com/apache/datafusion-comet/pull/449#discussion_r1608872166


##########
spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala:
##########
@@ -1038,6 +1038,26 @@ class CometExpressionSuite extends CometTestBase with 
AdaptiveSparkPlanHelper {
       }
     }
   }
+  test("hex") {
+    Seq(true, false).foreach { dictionaryEnabled =>
+      withTempDir { dir =>
+        val path = new Path(dir.toURI.toString, "hex.parquet")
+        makeParquetFileAllTypes(path, dictionaryEnabled = dictionaryEnabled, 
10000)
+
+        withParquetTable(path.toString, "tbl") {
+          // ints
+          checkSparkAnswerAndOperator("SELECT hex(_2), hex(_3), hex(_4), 
hex(_5) FROM tbl")
+
+          // uints, uint8 and uint16 not working yet
+          // checkSparkAnswerAndOperator("SELECT hex(_9), hex(_10), hex(_11), 
hex(_12) FROM tbl")
+          checkSparkAnswerAndOperator("SELECT hex(_11), hex(_12) FROM tbl")
+
+          // strings, binary
+          checkSparkAnswerAndOperator("SELECT hex(_8), hex(_14) FROM tbl")

Review Comment:
   1caa6fd adds the other columns... `_13` also fails as the rust code is 
provide with a `Dictionary(Int32, Utf8)` that isn't matched on.



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