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Brendan Clement
6389784dde
The guide applied the local decorated callable to `table["value"]`, which
raises TypeError: a table is not subscriptable, and add_columns takes an
application of a registered version, not the callable's result.
The guide now walks one example from definition to filled column: define
`double`, call it locally, connect to Enterprise, create a table whose
`value` column matches the parameter's type and nullability, register the
function, apply `version(value=col("value"))`, refresh, wait, and read the
values back. Its snippets come from docs/web-tests/py/test_function.py.
The local tests in that file check what `@udf` sends for registration, how
a registered version binds a column, and that a local connection refuses
both registration and Function columns. The Enterprise walkthrough runs
only when LANCEDB_URI, LANCEDB_API_KEY and LANCEDB_HOST_OVERRIDE are set.
The page also stops promising that a retry after a failed refresh costs
only the unfinished rows.