rdblue commented on a change in pull request #1353:
URL: https://github.com/apache/iceberg/pull/1353#discussion_r472550187
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File path: core/src/main/java/org/apache/iceberg/BaseTableScan.java
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@@ -159,6 +159,10 @@ public TableScan option(String property, String value) {
@Override
public TableScan project(Schema projectedSchema) {
+ if (context.selectedColumns() != null) {
+ throw new IllegalStateException("Cannot project schema when selected
columns is specified.");
+ }
Review comment:
We would normally use a `Precondition` check here:
```java
Preconditions.checkState(context.selectedColumns() == null, "Cannot ...");
```
I was also going to say that I think we should check the reverse as well, in
case `project` is called before `select`, but it looks like the projection is
tracked outside of the context for some reason. I don't think that's quite
right. We probably want to move `project` to the context as well.
@edgarRd, do you know why `project` doesn't use the scan context?
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