ConstantExpression fc1 = new ConstantExpression(fp1,
new Integer(0), new LogicalFieldSchema(null, null, DataType.INTEGER));
new EqualExpression(fp1, fy1, fc1);
LOFilter D1 = new LOFilter(lp, fp1);
LogicalSchema cschema = new LogicalSchema();
cschema.addField(new LogicalSchema.LogicalFieldSchema(
"x", null, DataType.INTEGER));
cschema.addField(new LogicalSchema.LogicalFieldSchema(
"y", null, DataType.INTEGER));
D1.neverUseForRealSetSchema(cschema);
lp.add(D1);