wgtmac opened a new pull request, #60: URL: https://github.com/apache/parquet-testing/pull/60
See: https://github.com/apache/arrow/issues/43994 The Parquet file was created by parquet-java 1.14.3 with following code: ```java package org.example; import org.apache.avro.Schema; import org.apache.avro.generic.GenericData; import org.apache.avro.generic.GenericRecord; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.parquet.avro.AvroParquetWriter; import org.apache.parquet.hadoop.ParquetWriter; import java.io.IOException; import java.util.Arrays; import java.util.stream.Collectors; import java.util.stream.Stream; public class TwoLevelList { public static void main(String[] args) { Schema schema = new Schema.Parser().parse("{" + "\"type\":\"record\"," + "\"name\":\"my_record\"," + "\"fields\":[" + " {" + " \"name\":\"a\"," + " \"type\":{\"type\":\"array\", \"items\":{\"type\":\"array\", \"items\":\"int\"}}" + " }" + "]" + "}"); GenericRecord record = new GenericData.Record(schema); // Write [[1, 2], [3, 4]] to the avro record record.put("a", Stream.of(Arrays.asList(1, 2), Arrays.asList(3, 4)) .map(list -> { Schema innerListType = schema.getField("a").schema().getElementType(); GenericData.Array<Integer> innerList = new GenericData.Array<>(list.size(), innerListType); innerList.addAll(list); return innerList; }).collect(Collectors.toList())); Path file = new Path("/tmp/old_list_structure.parquet"); Configuration conf = new Configuration(); conf.set("parquet.avro.write-old-list-structure", "true"); // this is the default value try (ParquetWriter<GenericRecord> writer = AvroParquetWriter.<GenericRecord>builder(file) .withSchema(schema) .withConf(conf) .build()) { writer.write(record); } catch (IOException e) { throw new RuntimeException(e); } } } ``` File metadata using parquet-cli: ``` > parquet-cli meta /tmp/old_list_structure.parquet File path: /tmp/test.parquet Created by: parquet-mr version 1.14.3 (build b5e376a2caee767a11e75b783512b14cf8ca90ec) Properties: parquet.avro.schema: {"type":"record","name":"my_record","fields":[{"name":"a","type":{"type":"array","items":{"type":"array","items":"int"}}}]} writer.model.name: avro Schema: message my_record { required group a (LIST) { repeated group list { required group element (LIST) { repeated group list { required int32 element; } } } } } Row group 0: count: 1 53.00 B records start: 4 total(compressed): 53 B total(uncompressed):53 B -------------------------------------------------------------------------------- type encodings count avg size nulls min / max a.list.element.list.element INT32 _ _ 4 13.25 B 0 "1" / "4" ``` Data using parquet-cli: ``` > parquet-cli cat /tmp/old_list_structure.parquet {"a": [[1, 2], [3, 4]]} ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
