Timo Walther created FLINK-8240:
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Summary: Create unified interfaces to configure and instatiate
TableSources
Key: FLINK-8240
URL: https://issues.apache.org/jira/browse/FLINK-8240
Project: Flink
Issue Type: New Feature
Components: Table API & SQL
Reporter: Timo Walther
Assignee: Timo Walther
At the moment every table source has different ways for configuration and
instantiation. Some table source are tailored to a specific encoding (e.g.,
{{KafkaAvroTableSource}}, {{KafkaJsonTableSource}}) or only support one
encoding for reading (e.g., {{CsvTableSource}}). Each of them might implement a
builder or support table source converters for external catalogs.
The table sources should have a unified interface for discovery, defining
common properties, and instantiation. The {{TableSourceConverters}} provide a
similar functionality but use a external catalog. We might generialize this
interface.
In general a table source declaration depends on the following parts:
- Source
- Type (e.g. Kafka, Custom)
- Properties (e.g. topic, connection info)
- Encoding
- Type (e.g. Avro, JSON, CSV)
- Schema (e.g. Avro class, JSON field names/types)
- Rowtime descriptor/Proctime
- Watermark strategy and Watermark properties
- Time attribute info
- Bucketization
This issue needs a design document before implementation. Any discussion is
very welcome.
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