apache / apache/arrow-java

[Java][FlightRPC] Handle binding parameters when server can't provide the expected type

Abierto
#153 3 comentarios 0 reacciones 0 asignados Ver en GitHub
Lenguaje dominante
Java
Estrellas
94
Forks
152
Merge medio
3 d 16 h
PR fusionados (30 d)
11

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

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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.

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

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

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