rdblue edited a comment on pull request #828:
URL: https://github.com/apache/iceberg/pull/828#issuecomment-638486083
Running the current tests with coverage shows that there are a few places
that are not getting tested:
* ~~Code paths for missing columns because there are no projection tests.~~
* Struct code paths because there are not tests for nested structs, only
top-level columns.
* `VectorizedParquetDefinitionLevelReader.setNulls` -- looks like the random
data doesn't produce enough consecutive null values for this to get used
* `DictionaryDecimalBinaryAccessor` and
`VectorizedDictionaryEncodedParquetValuesReader.readBatchOfDictionaryEncodedFixedWidthBinary`
-- I'm not sure why, but it looks like dictionary-encoded decimals stored as
fixed are not getting tested. I would start by adding assertions to tests that
the Parquet files are written as you expect (all dictionary encoded or
fallback).
* All code paths where `setArrowValidityVector` is true. I think we should
have tests for these as well.
* Code paths for timestamp-millis -- this is probably okay.
I wrote a test for nested structs to fix coverage, but it currently fails.
Here's the test case:
```java
@Test
public void testNestedStruct() throws IOException {
writeAndValidate(TypeUtil.assignIncreasingFreshIds(new
Schema(required(1, "struct", SUPPORTED_PRIMITIVES))));
}
```
```
java.lang.ClassCastException: Cannot cast
org.apache.iceberg.spark.data.vectorized.ColumnarBatchReader to
org.apache.iceberg.arrow.vectorized.VectorizedArrowReader
at java.lang.Class.cast(Class.java:3369)
at
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at
java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:545)
at
java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
at
java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:438)
at
org.apache.iceberg.spark.data.vectorized.ColumnarBatchReader.<init>(ColumnarBatchReader.java:45)
```
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