LogicalSchema aschema = new LogicalSchema();
aschema.addField(new LogicalSchema.LogicalFieldSchema(
"x", null, DataType.INTEGER));
aschema.getField(0).uid = 1;
LOLoad A = new LOLoad(null, null, lp, null);
A.neverUseForRealSetSchema(aschema);
lp.add(A);
// B = load
LogicalSchema bschema = new LogicalSchema();
bschema.addField(new LogicalSchema.LogicalFieldSchema(