LIMIT

The LIMIT clause can be used to limit the number of rows being selected. This is often used in conjunction with the ORDER BY clause to perform Top N (or Bottom N) analysis.

In SQL Frames the LIMIT operation can be performed using the df.limit() API.

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Performance considerations

In SQL Frames most clauses of the SELECT statement result in creating a separate DataFrame. However, the LIMIT operation does not create a separate DataFrame. Hence, in order to limit the data for a specific query and not impact rest of the queries that depend on it, a DataFrame can be first projected using df.pdf() and then the limit can be applied.