vvysotskyi commented on a change in pull request #2026: DRILL-7330: Implement
metadata usage for all format plugins
URL: https://github.com/apache/drill/pull/2026#discussion_r392683321
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/scan/file/FileMetadataColumn.java
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@@ -65,6 +82,11 @@ public FileMetadataColumn(String name,
FileMetadataColumnDefn defn) {
@Override
public MetadataColumn resolve(FileMetadata fileInfo, VectorSource source,
int sourceIndex) {
- return new FileMetadataColumn(name(), defn, fileInfo, source, sourceIndex);
+ if (value() == null) {
+ return new FileMetadataColumn(name(), defn, fileInfo, source,
sourceIndex);
+ } else {
+ // case of metadata column, which should have null value independently
of its column definition
+ return new FileMetadataColumn(name(), defn, (String) null, source,
sourceIndex);
Review comment:
This change is required only for the case when we need to enforce the value
of the implicit column to `null` before it is written to the vector.
I have reworked changes in the `ReaderSchemaOrchestrator`, so this one is
not required anymore.
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