* Only support the following Pig data types: int, long, float, double, boolean and chararray
* */
private String partitionFilterToWhereClauseString(Expression expression) throws IOException
{
Expression.BinaryExpression be = (Expression.BinaryExpression) expression;
OpType op = expression.getOpType();
String opString = op.toString();
switch (op)
{
case OP_EQ:
opString = " = ";
case OP_GE: