rdblue commented on code in PR #9366:
URL: https://github.com/apache/iceberg/pull/9366#discussion_r1439064941
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core/src/main/java/org/apache/iceberg/avro/AvroIterable.java:
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@@ -78,7 +79,8 @@ public CloseableIterator<D> iterator() {
if (start != null) {
if (reader instanceof SupportsRowPosition) {
((SupportsRowPosition) reader)
- .setRowPositionSupplier(() ->
AvroIO.findStartingRowPos(file::newStream, start));
+ .setRowPositionSupplier(
+ Suppliers.memoize(() ->
AvroIO.findStartingRowPos(file::newStream, start)));
Review Comment:
Previously, this was being done in the `StructValueReader`. If the struct
[reader inserted a
`PositionReader`](https://github.com/apache/iceberg/pull/9366/files#diff-08597bac062ea934a49ebeb66da72f459dea1da642e1df2cdd2c8ca6884fed4dL626-L631),
it would also rewrite the position supplier.
That was a lot of complication for the value reader and didn't work in all
cases (for example, if two structs had position columns) so I moved the
memoization here. It's simpler that way.
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