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https://issues.apache.org/jira/browse/PIG-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697056#action_12697056
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Alan Gates commented on PIG-745:
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I'm reviewing this patch.
> Please add DataTypes.toString() conversion function
> ---------------------------------------------------
>
> Key: PIG-745
> URL: https://issues.apache.org/jira/browse/PIG-745
> Project: Pig
> Issue Type: Improvement
> Reporter: David Ciemiewicz
> Attachments: PIG-745.patch
>
>
> I'm doing some work in string manipulation UDFs and I've found that it would
> be very convenient if I could always convert the argument to a chararray
> (internally a Java String).
> For example TOLOWERCASE(arg) shouldn't really care whether arg is a
> bytearray, chararray, int, long, double, or float, it should be treated as a
> string and operated on.
> The simplest and most foolproof method would be if the DataTypes added a
> static function of DataTypes.toString which did all of the argument type
> checking and provided consistent translation.
> I believe that this function might be coded as:
> public static String toString(Object o) throws ExecException {
> try {
> switch (findType(o)) {
> case BOOLEAN:
> if (((Boolean)o) == true) return new String('1');
> else return new String('0');
> case BYTE:
> return ((Byte)o).toString();
> case INTEGER:
> return ((Integer)o).toString();
> case LONG:
> return ((Long)o).toString();
> case FLOAT:
> return ((Float)o).toString();
> case DOUBLE:
> return ((Double)o).toString();
> case BYTEARRAY:
> return ((DataByteArray)o).toString();
> case CHARARRAY:
> return (String)o;
> case NULL:
> return null;
> case MAP:
> case TUPLE:
> case BAG:
> case UNKNOWN:
> default:
> int errCode = 1071;
> String msg = "Cannot convert a " + findTypeName(o) +
> " to an String";
> throw new ExecException(msg, errCode,
> PigException.INPUT);
> }
> } catch (ExecException ee) {
> throw ee;
> } catch (Exception e) {
> int errCode = 2054;
> String msg = "Internal error. Could not convert " + o +
> " to String.";
> throw new ExecException(msg, errCode, PigException.BUG);
> }
> }
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