apache / apache/arrow-java

[JDBC] Exception handling for non-simple types swallows actual error during processing

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#94 0 comentarios 0 reacciones 0 asignados Ver en GitHub
Lenguaje dominante
Java
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94
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Merge medio
3 d 16 h
PR fusionados (30 d)
11

Descripción

### Describe the bug, including details regarding any error messages, version, and platform.

It appears as though apache/arrow#39356 added support for better error messages when an error is encountered during JDBC processing. However, some `MinorType` such as Decimal (and various others) do not have an associated ArrowType and throw an exception trying to get the additional information leading to the original error being suppressed.

Decimal MinorType:
https://github.com/apache/arrow/blob/main/java/vector/src/main/java/org/apache/arrow/vector/types/Types.java#L583

Callsite for suppressing error:
https://github.com/apache/arrow/blob/main/java/vector/src/main/java/org/apache/arrow/vector/types/Types.java#L821

called from consumer (where minorType's arrow type is null)
https://github.com/apache/arrow/blob/main/java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/CompositeJdbcConsumer.java#L55

```
java.lang.RuntimeException: Error occurred while consuming data.
at org.apache.arrow.adapter.jdbc.ArrowVectorIterator.consumeData(ArrowVectorIterator.java:121)
at org.apache.arrow.adapter.jdbc.ArrowVectorIterator.load(ArrowVectorIterator.java:164)
at org.apache.arrow.adapter.jdbc.ArrowVectorIterator.next(ArrowVectorIterator.java:183)
...
Caused by: java.lang.UnsupportedOperationException: Cannot get simple type for type DECIMAL
at org.apache.arrow.vector.types.Types$MinorType.getType(Types.java:821)
at org.apache.arrow.adapter.jdbc.consumer.CompositeJdbcConsumer.consume(CompositeJdbcConsumer.java:55)
at org.apache.arrow.adapter.jdbc.ArrowVectorIterator.consumeData(ArrowVectorIterator.java:107)
... 95 more
```

suppressed error (via debugger):
```
java.lang.UnsupportedOperationException: BigDecimal precision cannot be greater than that in the Arrow vector: 39 > 38
at org.apache.arrow.vector.util.DecimalUtility.checkPrecisionAndScale(DecimalUtility.java:99)
at org.apache.arrow.vector.DecimalVector.set(DecimalVector.java:365)
at org.apache.arrow.adapter.jdbc.consumer.DecimalConsumer.set(DecimalConsumer.java:79)
at org.apache.arrow.adapter.jdbc.consumer.DecimalConsumer$NullableDecimalConsumer.consume(DecimalConsumer.java:101)
at org.apache.arrow.adapter.jdbc.consumer.CompositeJdbcConsumer.consume(CompositeJdbcConsumer.java:50)
at org.apache.arrow.adapter.jdbc.ArrowVectorIterator.consumeData(ArrowVectorIterator.java:107)
at org.apache.arrow.adapter.jdbc.ArrowVectorIterator.load(ArrowVectorIterator.java:164)
at org.apache.arrow.adapter.jdbc.ArrowVectorIterator.next(ArrowVectorIterator.java:183)
```

It is somewhat difficult to come up with a simple reproduction, but I getting this error by rounding decimals that should be too large to fit into a `decimal(38,10)` -- if a decimal exceeds this (such as the numeric value of `99999999999999999999999999999.9999999999` which requires 39 digits of precision) this error is thrown.

This is happening on version 15.0.0 and up. (was not occurring in 14.0.X and below).

### Component(s)

Java

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Línea de trabajo

Comience con CompositeJdbcConsumer.consume y, a continuación, inspeccione Types.java, DecimalConsumer.java y ArrowVectorIterator.consumeData para rastrear cómo se reemplaza el error de precisión original de Decimal. Reproduzca un valor JDBC que supere decimal(38,10) y verifique que el procesamiento informe del error de precisión subyacente en lugar de la UnsupportedOperationException de MinorType.getType().

Escrito por el modelo de indexación a partir del texto del issue.

Evaluación

Stack tecnológico
java
Área
databases
Tipo de issue
Error
Dificultad
3/5
Tiempo estimado
1-2 días
Estado de actividad
Estancado
Claridad
Bastante claro
Aptitud para principiantes
48/100

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