getChan commented on PR #17861: URL: https://github.com/apache/datafusion/pull/17861#issuecomment-3513022241
> Hey @getChan, I came across this same issue on Friday while working on an implementation of the writer. The `arrow-avro` reader can absolutely handle a schema with a custom name; there are thorough tests in the crate that demonstrate this. What I think is going on here is that the name is lost in the Original Avro -> DataFusion SchemaRef -> Projected Avro process. The `AvroSchema::try_from()` in AvroSource generates a projected schema without the name. We need that optimized schema in order to provide the ReaderBuilder with the correct projection. In other words, it works fine when passing a named schema directly to the ReaderBuilder, but not one that has been funneled through the optimizations of DataFusion via Arrow, where some contextual information is lost. > > @jecsand838 any thoughts on this? Thanks for help. as you said. my Implementation injects a schema into arrow-avro to perform projection, but doing so causes the metadata to be lost. As a result, if I provide a schema for projection I cannot read the custom record name; conversely, if I don't provide a schema so I can read the custom record name, I can't perform projection. I'll try to find another solution. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
