@Override
public boolean equals(Object o) {
if (!(o instanceof ProjectOp)) return false;
ProjectOp other = (ProjectOp) o;
if (!getWrapped().equals(other.getWrapped())) return false;
return projections.equals(other.projections);
}
public static DatabaseOp extend(
DatabaseOp wrapped, Map<ColumnName, Expression> extensions, Vendor vendor) {
if (extensions.isEmpty()) return wrapped;
List<ProjectionSpec> specs = ProjectionSpec.createFromColumns(wrapped.getColumns());
for (ColumnName column : extensions.keySet()) {
specs.add(ProjectionSpec.create(column, extensions.get(column), vendor));
}
return ProjectOp.create(wrapped, specs);
}