JingsongLi commented on a change in pull request #1346:
URL: https://github.com/apache/iceberg/pull/1346#discussion_r473581304
##########
File path: flink/src/main/java/org/apache/iceberg/flink/FlinkSchemaUtil.java
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@@ -98,4 +102,22 @@ public static TableSchema toSchema(RowType rowType) {
}
return builder.build();
}
+
+ /**
+ * Prune columns from a {@link Schema} using a projected fields.
+ *
+ * @param schema a Schema
+ * @param projectedFields projected fields from Flink
+ * @return a Schema corresponding to the Flink projection
+ * @throws IllegalArgumentException if the Flink type does not match the
Schema
+ */
+ public static Schema pruneWithoutReordering(Schema schema, List<String>
projectedFields) {
+ if (projectedFields == null) {
+ return schema;
+ }
+
+ Map<String, Integer> indexByName = TypeUtil.indexByName(schema.asStruct());
+ Set<Integer> projectedIds =
projectedFields.stream().map(indexByName::get).collect(Collectors.toSet());
+ return TypeUtil.select(schema, projectedIds);
Review comment:
Thanks @openinx and @rdblue ! I'm very happy to be able to solve my
confusion. I will do it.
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