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);
LogicalExpressionPlan fp2 = new LogicalExpressionPlan();
ProjectExpression fy2 = new ProjectExpression(fp2, 0, 1, null);
ConstantExpression fc2 = new ConstantExpression(fp2,