mihaibudiu commented on code in PR #4139:
URL: https://github.com/apache/calcite/pull/4139#discussion_r1917351595
##########
core/src/main/java/org/apache/calcite/rel/type/RelDataTypeFactoryImpl.java:
##########
@@ -410,6 +410,31 @@ private RelDataType copyRecordType(
return canonize(newType);
}
+ @Override public RelDataType enforceTypeWithNullability(
+ final RelDataType type,
+ final boolean nullable) {
+ requireNonNull(type, "type");
+ RelDataType newType;
+ if (type.isNullable() == nullable) {
+ newType = type;
+ } else if (type instanceof RelRecordType) {
+ return createStructType(type.getStructKind(),
+ new AbstractList<RelDataType>() {
+ @Override public RelDataType get(int index) {
+ return type.getFieldList().get(index).getType();
+ }
+
+ @Override public int size() {
+ return type.getFieldCount();
+ }
+ },
+ type.getFieldNames(), nullable);
+ } else {
Review Comment:
I will add this to history.md in the section on breaking changes:
```
*RelDataTypeFactory interface*. The fix for [<a
href="https://issues.apache.org/jira/browse/CALCITE-6764";>CALCITE-6764</a>]
introduces a new method
`RelDataTypeFactory#enforceTypeWithNullability` in the existing
`RelDataTypeFactory` interface. The behavior of the new function is
similar to the existing API `createTypeWithNullability`; however, the
existing implementations of the `createTypeWithNullability` API cannot
create nullable record (`ROW`) types. Nullable record types are
legitimate in several SQL dialects.
```
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