snuyanzin commented on PR #23365:
URL: https://github.com/apache/flink/pull/23365#issuecomment-1708113247
One inconsistency I noticed between table and sql (probably minor):
e.g. there is a table with columns `a`, `b`, `c`
```sql
SELECT *, * FROM my_table;
```
results to
```
a b c a0 b0 c0
------- -------- -------- --------- --------- --------
```
in case of table api
```java
...
tableEnv.from("my_table").select(withAllColumns(), withAllColumns())
...
```
it just fails like
```
org.apache.flink.table.api.ValidationException: Ambiguous column name: a
at
org.apache.flink.table.operations.utils.ProjectionOperationFactory.lambda$validateAndGetUniqueNames$4(ProjectionOperationFactory.java:109)
at
java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at
java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at
java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at
java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at
java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
at
org.apache.flink.table.operations.utils.ProjectionOperationFactory.validateAndGetUniqueNames(ProjectionOperationFactory.java:106)
at
org.apache.flink.table.operations.utils.ProjectionOperationFactory.create(ProjectionOperationFactory.java:74)
at
org.apache.flink.table.operations.utils.OperationTreeBuilder.projectInternal(OperationTreeBuilder.java:200)
at
org.apache.flink.table.operations.utils.OperationTreeBuilder.project(OperationTreeBuilder.java:174)
```
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