Determine Spanner schema at pipeline construction in cross-language SpannerIO
Open
cross-language
gcp
improvement
io
java
P3
python
- Dominant language
- Java
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Description
For now Spanner's cross-language transform requires to get Beam Schema. It should be possible to determine the schema otherwise.
One solution would be to execute query with spanner client and then translate spanner schema to beam schema. But this is very poor solution as the query would be executed twice.
Look for it at SpannerTransformRegistrar.ReadBuilder
Imported from Jira [BEAM-10851](https://issues.apache.org/jira/browse/BEAM-10851). Original Jira may contain additional context.
Reported by: piotr-szuberski.
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