How do associations work in the Cloud Spanner database?

How do connections in the Google Cloud Spanner database work?

Will a quick connection request be executed? Is there any comparison between SQL (MySql, Oracle, MSSQL) and NewSQL (Cloud Spanner / TiDB / CockroachDB)?

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TiDB supports connection. TiDB stores data in a tikv server and processes sql in a tidb server. tidb-server will retrieve data from the tikv server and process the SQL logic.

TiDB HashJoin . SortMergeJoin IndexLookupJoin, SQL-. HashJoin - . SortMergeJoin IndexLookupJoin . . TiDB , .

, HashJoin TiDB. Parallel HashJoin

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