Preview table without querying #64
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The current implementation of the preview functionality uses a query along the lines of
SELECT * FROM <table> {LIMIT <num_of_rows>}to visualize (a subset of) the rows of a table. Querying the entire table can be pretty costly however and theLIMITclause does not necessarily reduce the cost for non-clustered tables (see BigQuery API documentation).This pull request uses the getRows() alternative which doesn't incur any costs. It supports the current functionality to specify the number of rows returned but removes the job information as that is no longer applicable