zhong-yj opened a new issue #3080:
URL: https://github.com/apache/iceberg/issues/3080
I met a ClassCastException while using Flink to read MapData from parquet
format data file,
`java.lang.ClassCastException:
org.apache.iceberg.flink.data.FlinkParquetReaders$ReusableArrayData cannot be
cast to org.apache.flink.table.data.ColumnarArrayData
at
org.apache.flink.table.runtime.typeutils.ArrayDataSerializer.copy(ArrayDataSerializer.java:90)
at
org.apache.flink.table.runtime.typeutils.ArrayDataSerializer.copy(ArrayDataSerializer.java:47)
at
org.apache.flink.table.runtime.typeutils.RowDataSerializer.copyRowData(RowDataSerializer.java:170)
at
org.apache.flink.table.runtime.typeutils.RowDataSerializer.copy(RowDataSerializer.java:131)
at
org.apache.flink.table.runtime.typeutils.RowDataSerializer.copy(RowDataSerializer.java:48)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.pushToOperator(CopyingChainingOutput.java:69)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:46)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:26)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:56)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:29)
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$ManualWatermarkContext.processAndCollect(StreamSourceContexts.java:317)
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$WatermarkContext.collect(StreamSourceContexts.java:411)
at
org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction.run(InputFormatSourceFunction.java:92)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:138)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:74)
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:263)`
I found that Flink use
org.apache.flink.table.runtime.typeutils.MapDataSerializer to serialize MapData
as BinaryMapData for transmission in Flink OperatorChaining, but
FlinkParquetReaders$MapReader returns FlinkParquetReaders$ReusableMapData type
data which the MapDataSerializer can't recognize, which causes the
ClassCastException. And I met the same problem when using Flink to read
ArrayData from parquet data file:
`java.lang.ClassCastException:
org.apache.iceberg.flink.data.FlinkParquetReaders$ReusableArrayData cannot be
cast to org.apache.flink.table.data.ColumnarArrayData
at
org.apache.flink.table.runtime.typeutils.ArrayDataSerializer.copy(ArrayDataSerializer.java:90)
at
org.apache.flink.table.runtime.typeutils.ArrayDataSerializer.copy(ArrayDataSerializer.java:47)
at
org.apache.flink.table.runtime.typeutils.RowDataSerializer.copyRowData(RowDataSerializer.java:170)
at
org.apache.flink.table.runtime.typeutils.RowDataSerializer.copy(RowDataSerializer.java:131)
at
org.apache.flink.table.runtime.typeutils.RowDataSerializer.copy(RowDataSerializer.java:48)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.pushToOperator(CopyingChainingOutput.java:69)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:46)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:26)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:56)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:29)
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$ManualWatermarkContext.processAndCollect(StreamSourceContexts.java:317)
at
org.apache.flink.streaming.api.operators.StreamSourceContexts$WatermarkContext.collect(StreamSourceContexts.java:411)
at
org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction.run(InputFormatSourceFunction.java:92)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:138)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:74)
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:263)`
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