fornaix opened a new pull request #18679:
URL: https://github.com/apache/flink/pull/18679
## What is the purpose of the change
Suppose we have a map field that needs to be expanded.
```sql
CREATE TABLE t (
id INT,
map_field MAP<STRING, INT>
) WITH (
-- ...
)
SELECT id, k, v FROM t, unnest(map_field) as A(k, v)
```
We will get the following runtime exception:
```
Caused by: java.lang.ClassCastException:
org.apache.flink.table.data.binary.BinaryStringData cannot be cast to
java.lang.Integer
at
org.apache.flink.table.data.GenericRowData.getInt(GenericRowData.java:149)
at
org.apache.flink.table.data.utils.JoinedRowData.getInt(JoinedRowData.java:149)
at
org.apache.flink.table.data.RowData.lambda$createFieldGetter$245ca7d1$6(RowData.java:245)
at
org.apache.flink.table.data.RowData.lambda$createFieldGetter$25774257$1(RowData.java:296)
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:80)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:57)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:29)
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.table.runtime.util.StreamRecordCollector.collect(StreamRecordCollector.java:44)
at
org.apache.flink.table.runtime.collector.TableFunctionCollector.outputResult(TableFunctionCollector.java:68)
at StreamExecCorrelate$10$TableFunctionCollector$4.collect(Unknown
Source)
at
org.apache.flink.table.runtime.collector.WrappingCollector.outputResult(WrappingCollector.java:39)
at
StreamExecCorrelate$10$TableFunctionResultConverterCollector$8.collect(Unknown
Source)
at
org.apache.flink.table.functions.TableFunction.collect(TableFunction.java:197)
at
org.apache.flink.table.runtime.functions.SqlUnnestUtils$MapUnnestTableFunction.eval(SqlUnnestUtils.java:169)
at StreamExecCorrelate$10.processElement(Unknown Source)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.pushToOperator(CopyingChainingOutput.java:82)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:57)
at
org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.collect(CopyingChainingOutput.java:29)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:56)
at
org.apache.flink.streaming.api.operators.CountingOutput.collect(CountingOutput.java:29)
```
This PR is to fix it.
## Brief change log
- Fix the incorrect value getter in map unnest table function
## Verifying this change
This change added tests and can be verified as follows:
```shell
mvn test -Dtest=UnnestTest,LogicalUnnestRuleTest,UnnestITCase
-DfailIfNoTests=false -pl
flink-table/flink-table-runtime,flink-table/flink-table-planner
```
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
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