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Usesvv_* tables for Redshift metadata queries#2431
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Redshift supports a concept of external tables. These tables can bequeried and insert into, but they are not exposed in the regular`information_schema.tables` metadata. We should instead use `svv_tables`and `svv_columns` to get information about the tables (those viewscontain information for both external and regular tables).
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Redshift supports a concept of external tables. These tables can be queried and insert into, but they are not exposed in the regular
information_schema.tablesmetadata. We should instead usesvv_tablesandsvv_columnsto get information about the tables (those views contain information for both external and regular tables).This PR is an attempt to add support for external tables to our Redshift implementation. Unfortunately it breaks some of the assumptions in the metadata queries