JingsongLi commented on a change in pull request #1353:
URL: https://github.com/apache/iceberg/pull/1353#discussion_r472661716
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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:
Another thing is: `BaseTableScan.lazyColumnProjection` looks weird. It
looks only work for `DataTableScan`. Because other table scan like
`MetadataTableScan`, the file/expected scan schema is different from
`table.schema()`. But in `BaseTableScan.lazyColumnProjection`, it use
`table.schema()` to select. And for `rowFilter`, it looks only works for
`DataTableScan` selection, should not affect `MetadataTableScan`s selection.
In other words, we may need to implement different selections for various
scans.
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