feat(datasource): add Java-implemented data sources#65

Merged

andygrove merged 18 commits into

apache:mainfrom

andygrove:feat/columnar-value-udf

May 19, 2026

Commits on May 18, 2026

build(native): add async-trait and futures deps for Java data sources
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refactor(native): lift jthrowable_to_string into shared jni_util module
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feat(datasource): add DataSource interface and SessionContext.registerDataSource Java API
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feat(native): add JavaDataSource TableProvider and JNI registration
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docs(native): clarify JavaScanExec safety + schema check + JVM attach
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feat(datasource)!: pass framework allocator to DataSource.scan
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test(datasource): cover repeated scans within a single query
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test(datasource): cover empty-stream scan
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test(datasource): cover column projection through DataFusion
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test(datasource): reject scan whose schema differs from registered schema
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test(datasource): surface Java exception class and message from scan()
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test(datasource): reject null ArrowReader from scan()
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test(datasource): cover joining two registered Java data sources
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docs(datasource): document SessionContext.registerDataSource
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docs(datasource): clarify scan() is per-physical-scan, not per-query
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feat(examples): add JDBC-backed DataSource example using H2 + arrow-jdbc
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Commits on May 19, 2026