dongjoon-hyun commented on code in PR #1500:
URL: https://github.com/apache/orc/pull/1500#discussion_r1238261627


##########
c++/src/ConvertColumnReader.cc:
##########
@@ -257,169 +603,169 @@ namespace orc {
     switch (fileType.getKind()) {
       case BOOLEAN: {
         switch (_readType.getKind()) {
-          CASE_CREATE_READER(BYTE, BooleanToByte);
-          CASE_CREATE_READER(SHORT, BooleanToShort);
-          CASE_CREATE_READER(INT, BooleanToInt);
-          CASE_CREATE_READER(LONG, BooleanToLong);
-          CASE_CREATE_READER(FLOAT, BooleanToFloat);
-          CASE_CREATE_READER(DOUBLE, BooleanToDouble);
+          CASE_CREATE_READER(BYTE, BooleanToByte)
+          CASE_CREATE_READER(SHORT, BooleanToShort)
+          CASE_CREATE_READER(INT, BooleanToInt)
+          CASE_CREATE_READER(LONG, BooleanToLong)
+          CASE_CREATE_READER(FLOAT, BooleanToFloat)
+          CASE_CREATE_READER(DOUBLE, BooleanToDouble)
+          CASE_CREATE_READER(STRING, BooleanToString)
+          CASE_CREATE_READER(CHAR, BooleanToChar)
+          CASE_CREATE_READER(VARCHAR, BooleanToVarchar)
+          CASE_CREATE_DECIMAL_READER(Boolean)
+          CASE_CREATE_READER(TIMESTAMP, BooleanToTimestamp)
+          CASE_CREATE_READER(TIMESTAMP_INSTANT, BooleanToTimestamp)
           case BOOLEAN:
-          case STRING:
           case BINARY:
-          case TIMESTAMP:
           case LIST:
           case MAP:
           case STRUCT:
           case UNION:
-          case DECIMAL:
           case DATE:
-          case VARCHAR:
-          case CHAR:
-          case TIMESTAMP_INSTANT:
             CASE_EXCEPTION
         }
       }
       case BYTE: {
         switch (_readType.getKind()) {
-          CASE_CREATE_READER(BOOLEAN, ByteToBoolean);
-          CASE_CREATE_READER(SHORT, ByteToShort);
-          CASE_CREATE_READER(INT, ByteToInt);
-          CASE_CREATE_READER(LONG, ByteToLong);
-          CASE_CREATE_READER(FLOAT, ByteToFloat);
-          CASE_CREATE_READER(DOUBLE, ByteToDouble);
+          CASE_CREATE_READER(BOOLEAN, ByteToBoolean)
+          CASE_CREATE_READER(SHORT, ByteToShort)
+          CASE_CREATE_READER(INT, ByteToInt)
+          CASE_CREATE_READER(LONG, ByteToLong)
+          CASE_CREATE_READER(FLOAT, ByteToFloat)
+          CASE_CREATE_READER(DOUBLE, ByteToDouble)
+          CASE_CREATE_READER(STRING, ByteToString)
+          CASE_CREATE_READER(CHAR, ByteToChar)
+          CASE_CREATE_READER(VARCHAR, ByteToVarchar)
+          CASE_CREATE_DECIMAL_READER(Byte)
+          CASE_CREATE_READER(TIMESTAMP, ByteToTimestamp)
+          CASE_CREATE_READER(TIMESTAMP_INSTANT, ByteToTimestamp)
           case BYTE:
-          case STRING:
           case BINARY:
-          case TIMESTAMP:
           case LIST:
           case MAP:
           case STRUCT:
           case UNION:
-          case DECIMAL:
           case DATE:
-          case VARCHAR:
-          case CHAR:
-          case TIMESTAMP_INSTANT:
             CASE_EXCEPTION
         }
       }
       case SHORT: {
         switch (_readType.getKind()) {
-          CASE_CREATE_READER(BOOLEAN, ShortToBoolean);
-          CASE_CREATE_READER(BYTE, ShortToByte);
-          CASE_CREATE_READER(INT, ShortToInt);
-          CASE_CREATE_READER(LONG, ShortToLong);
-          CASE_CREATE_READER(FLOAT, ShortToFloat);
-          CASE_CREATE_READER(DOUBLE, ShortToDouble);
+          CASE_CREATE_READER(BOOLEAN, ShortToBoolean)
+          CASE_CREATE_READER(BYTE, ShortToByte)
+          CASE_CREATE_READER(INT, ShortToInt)
+          CASE_CREATE_READER(LONG, ShortToLong)
+          CASE_CREATE_READER(FLOAT, ShortToFloat)
+          CASE_CREATE_READER(DOUBLE, ShortToDouble)
+          CASE_CREATE_READER(STRING, ShortToString)
+          CASE_CREATE_READER(CHAR, ShortToChar)
+          CASE_CREATE_READER(VARCHAR, ShortToVarchar)
+          CASE_CREATE_DECIMAL_READER(Short)
+          CASE_CREATE_READER(TIMESTAMP, ShortToTimestamp)
+          CASE_CREATE_READER(TIMESTAMP_INSTANT, ShortToTimestamp)
           case SHORT:
-          case STRING:
           case BINARY:
-          case TIMESTAMP:
           case LIST:
           case MAP:
           case STRUCT:
           case UNION:
-          case DECIMAL:
           case DATE:
-          case VARCHAR:
-          case CHAR:
-          case TIMESTAMP_INSTANT:
             CASE_EXCEPTION
         }
       }
       case INT: {
         switch (_readType.getKind()) {
-          CASE_CREATE_READER(BOOLEAN, IntToBoolean);
-          CASE_CREATE_READER(BYTE, IntToByte);
-          CASE_CREATE_READER(SHORT, IntToShort);
-          CASE_CREATE_READER(LONG, IntToLong);
-          CASE_CREATE_READER(FLOAT, IntToFloat);
-          CASE_CREATE_READER(DOUBLE, IntToDouble);
+          CASE_CREATE_READER(BOOLEAN, IntToBoolean)
+          CASE_CREATE_READER(BYTE, IntToByte)
+          CASE_CREATE_READER(SHORT, IntToShort)
+          CASE_CREATE_READER(LONG, IntToLong)
+          CASE_CREATE_READER(FLOAT, IntToFloat)
+          CASE_CREATE_READER(DOUBLE, IntToDouble)
+          CASE_CREATE_READER(STRING, IntToString)
+          CASE_CREATE_READER(CHAR, IntToChar)
+          CASE_CREATE_READER(VARCHAR, IntToVarchar)
+          CASE_CREATE_DECIMAL_READER(Int)
+          CASE_CREATE_READER(TIMESTAMP, IntToTimestamp)
+          CASE_CREATE_READER(TIMESTAMP_INSTANT, IntToTimestamp)
           case INT:
-          case STRING:
           case BINARY:
-          case TIMESTAMP:
           case LIST:
           case MAP:
           case STRUCT:
           case UNION:
-          case DECIMAL:
           case DATE:
-          case VARCHAR:
-          case CHAR:
-          case TIMESTAMP_INSTANT:
             CASE_EXCEPTION
         }
       }
       case LONG: {
         switch (_readType.getKind()) {
-          CASE_CREATE_READER(BOOLEAN, LongToBoolean);

Review Comment:
   We need this semicolon removal in `branch-1.9` too.



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