[Java][FlightRPC] Handle binding parameters when server can't provide the expected type
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- Java
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Descripción
### Describe the enhancement requested
Based on apache/arrow-java#156, we need to support the case where the server can't specify the expected type of a given parameter.
> Not all servers can always provide an accurate type for bind parameters. What should we do there? Note that ADBC uses NA/NullType as a wildcard/placeholder type here. This isn't specified in Flight SQL itself, but perhaps we could adopt that convention as well.
Proposal:
- When the server doesn't know the type of any of the parameters, it can just set the parameter schema to `null` (or alternatively, an empty schema).
- When the server doesn't know the type of only some of the parameters, it can just set the respective Field to `NullType`.
- Before we start binding values, we transform the `preparedStatement.getParameterSchema()` based on the types of the given `TypedValues`. If the Schema is empty/null, we create every Field for the schema based on the TypedValue type. Otherwise, we replace all NullType fields with a Field based on the TypedValue.
The only potential drawback I see with this approach is that NullTypes can't be used for parameters. That being said, I can't really think of a case why one would want to do that.
### Component(s)
Java
Guía de contribución
Línea de trabajo
Comienza rastreando la vinculación de sentencias preparadas de FlightRPC desde preparedStatement.getParameterSchema() a través de los TypedValues utilizados antes de la vinculación. Verifica el manejo de un esquema null o vacío y de campos NullType individuales, mostrando la finalización cuando cada campo del esquema de parámetros se deriva del tipo TypedValue correspondiente.
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Evaluación
- Stack tecnológico
- java
- Área
- api
- Tipo de issue
- Nueva funcionalidad
- Dificultad
- 4/5
- Tiempo estimado
- 3-5 días
- Estado de actividad
- Estancado
- Claridad
- Bastante claro
- Aptitud para principiantes
- 45/100