POC - CSV Sink#71
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Introduce configuration keys and defaults for the upcoming CSV sink: base path, write mode (APPEND/OVERWRITE, default OVERWRITE), date format, delimiter, header toggle, and filename prefix. Co-authored-by: Cursor <cursoragent@cursor.com>
Add FileStorageClient abstraction (read/exists/write with whole-object semantics) and a single FlinkFileSystemStorageClient implementation backed by Flink's FileSystem, so the path scheme (file/gs/oss/cosn/s3) selects the backend without any cloud-provider SDKs. Includes unit tests. Co-authored-by: Cursor <cursoragent@cursor.com>
Add FileWriteStrategy with AppendWriteStrategy (read-modify-write, time-series) and OverwriteWriteStrategy (full-replace snapshot, no-op on empty buffer), plus a factory keyed on SINK_CSV_WRITE_MODE. Both no-op when the buffer is empty. Includes tests and an in-memory storage test helper. Co-authored-by: Cursor <cursoragent@cursor.com>
Add the Flink Sink V1 CsvSink and its CsvSinkWriter, which buffers Row outputs and flushes them on every checkpoint (snapshotState) and on close. Output rolls over daily to basePath/<jobId>/<prefix>-<date>.csv. Values are RFC-4180 escaped, nulls become empty cells, and Map/Collection/array values are JSON-encoded into a single cell. A Clock is injectable for deterministic date tests. Includes CsvSinkWriterTest. Co-authored-by: Cursor <cursoragent@cursor.com>
Register SINK_TYPE=csv in SinkOrchestrator via a new CsvSinkBuilder that reads Dagger Configuration (SINK_CSV_BASE_PATH required) and assembles the sink with its write strategy and Flink filesystem storage client. Pin the CSV sink to parallelism 1 in DaggerSqlJobBuilder so a single subtask owns the daily file, leaving other sinks untouched. Add SINK_TYPE_* constants and tests for the builder and orchestrator wiring. Co-authored-by: Cursor <cursoragent@cursor.com>
Add the CSV sink to configuration.md (TOC, SINK_TYPE list, and a full CSV Sink section covering SINK_CSV_* keys with examples and defaults) and to create_dagger.md (supported-sinks list, prerequisites bullet, and a CSV Sink section with a sample properties block and OVERWRITE/APPEND guidance). Co-authored-by: Cursor <cursoragent@cursor.com>
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