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Running predictions without a destination table #3116

@romainr

Description

@romainr

Is your feature request related to a problem?

As described in the excellent documentation, executing inferences requires a destination table.

Not requiring a destination table would help execute queries more interactively and be simpler to the end users.

I could not find the explanation in the design documentation why it was not possible to provide it as an option.

FROM table_references [WHERE where_condition] [LIMIT row_count] TO PREDICT result_table_reference [WITH attr_expr [, attr_expr ...]] USING model_table_reference; 

Describe the solution you'd like

TO PREDICT result_table_reference --> [TO PREDICT result_table_reference] optional

FROM table_references [WHERE where_condition] [LIMIT row_count] [WITH attr_expr [, attr_expr ...]] USING model_table_reference; 

and returns:

predicted_label column1 column2...

where predicted_label comes from the model used.

If a user wants to save the predictions, it would add the TO PREDICT class like today.

Describe alternatives
e.g. BigQuery ML does not require a destination table and a regular SELECT * works: https://cloud.google.com/bigquery-ml/docs/reference/standard-sql/bigqueryml-syntax-predict

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