Commits on Jul 12, 2023

1. Add support for validate_sql method to BigQuery …

   In CLI contexts MetricFlow will issue dry run queries as part
   of its warehouse validation operations, and so we are adding a
   validate_sql method to all adapters.
   
   This commit adds support for the validate_sql method to BigQuery. It
   does so by creating a BigQuery-specific `dry_run` method on the
   BigQueryConnectionManager. This simply passes through the input SQL
   with the `dry_run` QueryJobParameter flag set True. This will result
   in BigQuery computing and returning a cost estimate for the query,
   or raising an exception in the event the query is not valid.
   
   Note: constructing the response object involves some repetitive value
   extraction from the QueryResult returned by BigQuery. While I would
   ordinariy prefer to tidy this up first we are pressed for time, and so
   we postpone that cleanup in order to keep this change as isolated
   as possible.

   

   tlento committed Jul 12, 2023
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