fix: External rollup type conversions: cast double to decimal for postgres (#421) Thanks to @sandeepravi!

Author: sandeepravi

packages/cubejs-postgres-driver/driver/PostgresDriver.js

@@ -6,7 +6,8 @@ const BaseDriver = require('@cubejs-backend/query-orchestrator/driver/BaseDriver
 const { Pool } = pg;
 
 const GenericTypeToPostgres = {
-  string: 'text'
+  string: 'text',
+  double: 'decimal'
 };
 
 const DataTypeMapping = {};