voonhous opened a new pull request, #8711:
URL: https://github.com/apache/hudi/pull/8711
### Change Logs
If a Hudi-table's column with a complex type (struct) is evolved with newly
added fields, or reordered fields, Hudi-On-Flink will not be able to read the
parquet files that are in the old schema.
An error as such will be thrown:
Different errors will be thrown for schema evolution operations. If a new
column is added at the back of the struct column, the error below will be
thrown.
```log
Caused by: java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
at java.util.ArrayList.rangeCheck(ArrayList.java:659)
at java.util.ArrayList.get(ArrayList.java:435)
at org.apache.parquet.schema.GroupType.getType(GroupType.java:216)
at
org.apache.hudi.table.format.cow.ParquetSplitReaderUtil.createWritableColumnVector(ParquetSplitReaderUtil.java:528)
at
org.apache.hudi.table.format.cow.ParquetSplitReaderUtil.createWritableColumnVector(ParquetSplitReaderUtil.java:416)
at
org.apache.hudi.table.format.cow.vector.reader.ParquetColumnarRowSplitReader.createWritableVectors(ParquetColumnarRowSplitReader.java:217)
at
org.apache.hudi.table.format.cow.vector.reader.ParquetColumnarRowSplitReader.<init>(ParquetColumnarRowSplitReader.java:157)
at
org.apache.hudi.table.format.cow.ParquetSplitReaderUtil.genPartColumnarRowReader(ParquetSplitReaderUtil.java:148)
at
org.apache.hudi.table.format.RecordIterators.getParquetRecordIterator(RecordIterators.java:72)
at
org.apache.hudi.table.format.cow.CopyOnWriteInputFormat.open(CopyOnWriteInputFormat.java:132)
at
org.apache.hudi.table.format.cow.CopyOnWriteInputFormat.open(CopyOnWriteInputFormat.java:66)
at
org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction.run(InputFormatSourceFunction.java:84)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:110)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:67)
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:332)
```
If a column is added in the middle of the struct column, a error as such
will be thrown:
```log
java.lang.IllegalArgumentException: Unexpected type: INT32 at
org.apache.parquet.Preconditions.checkArgument(Preconditions.java:77) at
org.apache.hudi.table.format.cow.ParquetSplitReaderUtil.createWritableColumnVector(ParquetSplitReaderUtil.java:456)
at
org.apache.hudi.table.format.cow.ParquetSplitReaderUtil.createWritableColumnVector(ParquetSplitReaderUtil.java:413)
at
org.apache.hudi.table.format.cow.vector.reader.ParquetColumnarRowSplitReader.createWritableVectors(ParquetColumnarRowSplitReader.java:216)
at
org.apache.hudi.table.format.cow.vector.reader.ParquetColumnarRowSplitReader.<init>(ParquetColumnarRowSplitReader.java:156)
at
org.apache.hudi.table.format.cow.ParquetSplitReaderUtil.genPartColumnarRowReader(ParquetSplitReaderUtil.java:151)
at
org.apache.hudi.table.format.cow.CopyOnWriteInputFormat.open(CopyOnWriteInputFormat.java:151)
at
org.apache.hudi.table.format.cow.CopyOnWriteInputFormat.open(CopyOnWriteInputFormat.java:68)
at org.apache.flink.streaming.api.functions.so
urce.InputFormatSourceFunction.run(InputFormatSourceFunction.java:116) at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:128)
at
org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:73)
at
org.apache.flink.streaming.runtime.tasks.SourceStreamTask$LegacySourceFunctionThread.run(SourceStreamTask.java:333)
```
### Impact
_Describe any public API or user-facing feature change or any performance
impact._
None
### Risk level (write none, low medium or high below)
_If medium or high, explain what verification was done to mitigate the
risks._
None, adding additional logic to handle schema evolution operations on
complex STRUCT/ROW types.
### Documentation Update
_Describe any necessary documentation update if there is any new feature,
config, or user-facing change_
- _The config description must be updated if new configs are added or the
default value of the configs are changed_
- _Any new feature or user-facing change requires updating the Hudi website.
Please create a Jira ticket, attach the
ticket number here and follow the
[instruction](https://hudi.apache.org/contribute/developer-setup#website) to
make
changes to the website._
### Contributor's checklist
- [ ] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [ ] Change Logs and Impact were stated clearly
- [ ] Adequate tests were added if applicable
- [ ] CI passed
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