Please add DataTypes.toString() conversion function
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Key: PIG-745
URL: https://issues.apache.org/jira/browse/PIG-745
Project: Pig
Issue Type: Improvement
Reporter: David Ciemiewicz
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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