ConstReadonlyCURRENT: "CURRENT"Uses the stable, generally available runtime.
ReadonlyPIPELINE_CHANNEL_UNSPECIFIED: "PIPELINE_CHANNEL_UNSPECIFIED"Default value; the pipeline channel is not specified and defaults to CURRENT.
ReadonlyPREVIEW: "PREVIEW"Uses the latest preview runtime. Required for Auto CDF (read-time CDF) sources.
Release channel of the underlying pipeline's runtime. PREVIEW provides early access to the latest features but may be less stable. Some source table configurations (e.g., read-time CDF) require PREVIEW. Defaults to CURRENT if not specified.