paul-rogers commented on a change in pull request #2018: DRILL-7633: Fixes for
union and repeated list accessors
URL: https://github.com/apache/drill/pull/2018#discussion_r391431754
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File path:
exec/vector/src/main/java/org/apache/drill/exec/record/metadata/VariantColumnMetadata.java
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@@ -96,11 +134,13 @@ public StructureType structureType() {
public boolean isVariant() { return true; }
@Override
- public boolean isArray() { return type() == MinorType.LIST; }
+ public boolean isArray() {
+ return super.isArray() || type() == MinorType.LIST;
+ }
@Override
public ColumnMetadata cloneEmpty() {
- return new VariantColumnMetadata(name, type, variantSchema.cloneEmpty());
+ return new VariantColumnMetadata(name, type, mode, new VariantSchema());
Review comment:
Nicely done! We discussed the problem with `UNION` a while back and realized
it was a mess. Now I gotta deal with it...
The `typeString()` version is used, I presume, in a provided schema. Correct?
If so, then then the base class implementation is fine, the output will be
just `UNION`. If we think of Drill's `UNION` as like a Visual Basic or
PostgreSQL variant (or a Python variable), then the `UNION` type is sufficient:
a `UNION` can hold anything; no need to restrict what it might or might not
hold.
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