hzfanxinxin edited a comment on issue #1117:
URL: https://github.com/apache/iceberg/issues/1117#issuecomment-644553195
The null judgment is found in SparkParquetReaders.primitive :
```
@Override
public ParquetValueReader<?>
primitive(org.apache.iceberg.types.Type.PrimitiveType expected,
PrimitiveType primitive) {
ColumnDescriptor desc = type.getColumnDescription(currentPath());
if (primitive.getOriginalType() != null) {
switch (primitive.getOriginalType()) {
case ENUM:
case JSON:
case UTF8:
return new StringReader(desc);
case INT_8:
case INT_16:
case INT_32:
if (expected != null && expected.typeId() ==
Types.LongType.get().typeId()) {
return new IntAsLongReader(desc);
} else {
return new UnboxedReader(desc);
}
case DATE:
case INT_64:
case TIMESTAMP_MICROS:
return new UnboxedReader<>(desc);
case TIMESTAMP_MILLIS:
return new TimestampMillisReader(desc);
...
```
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