coderfender commented on code in PR #3056:
URL: https://github.com/apache/datafusion-comet/pull/3056#discussion_r2674392314


##########
spark/src/main/scala/org/apache/comet/GenerateDocs.scala:
##########
@@ -148,11 +148,37 @@ object GenerateDocs {
           }
         }
         w.write("<!-- prettier-ignore-end -->\n".getBytes)
+      } else if (line.trim == "<!--BEGIN:CAST_EVAL_MODE_TABLE-->") {
+        w.write("<!-- prettier-ignore-start -->\n".getBytes)
+        w.write("| From Type | To Type | LEGACY | ANSI | TRY |\n".getBytes)
+        w.write("|-|-|-|-|-|\n".getBytes)
+        for (fromType <- CometCast.supportedTypes) {
+          for (toType <- CometCast.supportedTypes) {
+            if (Cast.canCast(fromType, toType) && fromType != toType) {
+              val fromTypeName = fromType.typeName.replace("(10,2)", "")
+              val toTypeName = toType.typeName.replace("(10,2)", "")
+              val legacy = supportLevelStr(
+                CometCast.isSupported(fromType, toType, None, 
CometEvalMode.LEGACY))
+              val ansi = supportLevelStr(
+                CometCast.isSupported(fromType, toType, None, 
CometEvalMode.ANSI))
+              val tryMode = supportLevelStr(
+                CometCast.isSupported(fromType, toType, None, 
CometEvalMode.TRY))
+              w.write(s"| $fromTypeName | $toTypeName | $legacy | $ansi | 
$tryMode |\n".getBytes)
+            }
+          }
+        }
+        w.write("<!-- prettier-ignore-end -->\n".getBytes)
       }
     }
     w.close()
   }
 
+  private def supportLevelStr(level: SupportLevel): String = level match {
+    case Compatible(_) => "Compatible"
+    case Incompatible(_) => "Incompatible"
+    case Unsupported(_) => "Unsupported"

Review Comment:
   Sure I was planning to just concentrate it but I can break this table down 
by eval mode ( into 3 tables) and add notes in there .



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