twalthr commented on a change in pull request #12887:
URL: https://github.com/apache/flink/pull/12887#discussion_r454174539
##########
File path:
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/utils/DataTypeUtils.java
##########
@@ -217,29 +221,52 @@ public DataType visit(CollectionDataType
collectionDataType) {
@Override
public DataType visit(FieldsDataType fieldsDataType) {
- final List<DataType> newFields =
fieldsDataType.getChildren().stream()
+ final List<DataType> newDataTypes =
fieldsDataType.getChildren().stream()
.map(dt -> dt.accept(this))
.collect(Collectors.toList());
final LogicalType logicalType =
fieldsDataType.getLogicalType();
final LogicalType newLogicalType;
if (logicalType instanceof RowType) {
- final List<RowType.RowField> oldFields =
((RowType) logicalType).getFields();
- final List<RowType.RowField> newRowFields =
IntStream.range(0, oldFields.size())
+ final List<RowField> oldFields = ((RowType)
logicalType).getFields();
+ final List<RowField> newFields =
IntStream.range(0, oldFields.size())
.mapToObj(i ->
- new RowType.RowField(
+ new RowField(
oldFields.get(i).getName(),
-
newFields.get(i).getLogicalType(),
+
newDataTypes.get(i).getLogicalType(),
oldFields.get(i).getDescription().orElse(null)))
.collect(Collectors.toList());
newLogicalType = new RowType(
logicalType.isNullable(),
- newRowFields);
+ newFields);
+ } else if (logicalType instanceof StructuredType) {
Review comment:
I will try to improve the documentation for this a little bit. The
transformation needs to be applied transitively to adapt e.g. conversion
classes or precision throughout a data type and its fields.
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