stevenzwu commented on code in PR #16692:
URL: https://github.com/apache/iceberg/pull/16692#discussion_r3553828853
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parquet/src/main/java/org/apache/iceberg/parquet/ParquetMetricsRowGroupFilter.java:
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@@ -60,6 +63,12 @@ public ParquetMetricsRowGroupFilter(Schema schema,
Expression unbound, boolean c
this.schema = schema;
StructType struct = schema.asStruct();
this.expr = Binder.bind(struct, Expressions.rewriteNot(unbound),
caseSensitive);
+ this.initialDefaults = Maps.newHashMap();
+ for (Types.NestedField field : schema.columns()) {
Review Comment:
`schema.columns()` walks only top-level fields. nested field will still have
the same problem. Consider iterating all fields via
`TypeUtil.indexById(struct)`.
I am also wondering if we should just call `schema.findField(id)` inside
`predicate()`. Since `findField(id)` internally uses `lazyIdToField()` with a
cached map, it is unnecessary to keep another <id, initialDefault> here.
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