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Parable implements the read-only subset of Arrow Flight SQL needed to discover Workspace data and execute queries. Clients should inspect GetSqlInfo capability metadata instead of assuming that the server implements every Flight SQL operation.

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Query and metadata commands

GetFlightInfo validates and plans a SQL statement, then returns an opaque ticket. DoGet executes that ticket and streams Arrow record batches.

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Prepared statements

DoAction supports the read-only prepared statement lifecycle:
  • CreatePreparedStatement creates a server-side handle.
  • ClosePreparedStatement releases it.
Use prepared statements when query values come from users or another untrusted source. Transactions, savepoints, and prepared writes are not supported.

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Unsupported operations

The SQL surface does not support:
  • Writes, ingestion, or transactions.
  • DoPut or DoExchange.
  • Handshake, ListFlights, or PollFlightInfo.
  • Transaction, savepoint, or cancellation actions.
Unsupported commands return gRPC UNIMPLEMENTED. ListActions returns an empty stream because the server does not advertise actions proactively. Primary and foreign-key commands return logical metadata. They do not make the underlying tables enforce constraints.