feat: Initial support for grouped join pushdown #3156

Job	Run time
latest-tag-sha	23s
Build native Linux 20 x86_64-unknown-linux-gnu Python fallback	2m 31s
build	6m 26s
tests (20.x, athena-export-bucket-s3)	16m 10s
tests (20.x, bigquery-export-bucket-gcs)	8m 16s
tests (20.x, clickhouse)	5m 0s
tests (20.x, clickhouse-export-bucket-s3)	4m 44s
tests (20.x, databricks-jdbc)	5m 20s
tests (20.x, databricks-jdbc-export-bucket-s3)	6m 18s
tests (20.x, databricks-jdbc-export-bucket-azure)	5m 57s
tests (20.x, mssql)	4m 56s
tests (20.x, mysql)	4m 36s
tests (20.x, postgres)	4m 38s
tests (20.x, redshift)	6m 8s
tests (20.x, redshift-export-bucket-s3)	6m 19s
tests (20.x, snowflake)	5m 8s
tests (20.x, snowflake-export-bucket-s3)	5m 21s
tests (20.x, snowflake-export-bucket-azure)	5m 40s
tests (20.x, snowflake-export-bucket-azure-via-storage-integration)	5m 22s
tests (20.x, snowflake-export-bucket-gcs)	5m 21s
	1h 54m 34s

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