Introspection hangs on "table columns in schema.table"

I am using DataGrip 2019.3 on Mac os Mojave verion 10.14.6. I recently upgraded to Datagrip 2019.3 from 2019.2.  Since then my introspection has been very slow. In order to deal with that slowness, I turned off "auto-sync"  in "Data Sources and Drivers" . Then in "Data Sources and Drivers" I turned "introspect using JBDC meta-data". Since then I have deleted some tables and a schema, and cancelled the request in the middle. Ever since that hard stop with the IDE , the introspection is extremely slow and hangs on the first schema's table columms. 

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The event log shows : failed to retrieve columns for role_usage_grants.
java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused (Connection refused)
java.net.ConnectException: Connection refused (Connection refused).
Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused (Connection refused)
and 66 duplicate reports

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@Djamil ,

Could you email vasily.chernov@jetbrains.com me full IDE & SQL logs for investigation?

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