Merged PRs

dolt

2898: [memo] variable to disable merge join
Use SET @@GLOBAL.disable_merge_join = 1 to prevent join planning from every selecting a merge join. There will always be HASH_JOIN and INNER_JOIN alternatives.
2896: support for INSERT .. RETURNING, a postgres extension
2895: Bug fix: resolve column default expressions for ALTER COLUMN nodes
When building plan nodes to handle altering a column's nullability or type, without respecifying the full column definition, the built node should ensure any column default expressions are resolved.
This originally showed up as a panic in Doltgres, because Doltgres' TypeSanitzer found the UnresolvedColumnDefault instance and tried to invoke operations on it.
Note that it's not currently possible to trigger this issue with Dolt or GMS because MySQL has a more limited syntax than Postgres for altering a column without respecfiying its full column definition, and Dolt/GMS does not support that syntax currently (e.g. ALTER TABLE t ALTER COLUMN SET VISIBLE).

Read Tests	MySQL	Dolt	Multiple
covering_index_scan	1.89	0.67	0.35
groupby_scan	13.7	17.95	1.31
index_join	1.5	2.43	1.62
index_join_scan	1.44	1.42	0.99
index_scan	34.95	29.72	0.85
oltp_point_select	0.18	0.26	1.44
oltp_read_only	3.49	5.28	1.51
select_random_points	0.34	0.6	1.76
select_random_ranges	0.37	0.63	1.7
table_scan	34.95	31.37	0.9
types_table_scan	75.82	114.72	1.51
reads_mean_multiplier			1.27

Write Tests	MySQL	Dolt	Multiple
oltp_delete_insert	8.9	6.32	0.71
oltp_insert	4.1	3.13	0.76
oltp_read_write	9.06	11.45	1.26
oltp_update_index	4.18	3.19	0.76
oltp_update_non_index	4.18	3.07	0.73
oltp_write_only	5.77	6.32	1.1
types_delete_insert	8.43	6.67	0.79
writes_mean_multiplier			0.87

TPC-C TPS Tests	MySQL	Dolt	Multiple
tpcc-scale-factor-1	96.45	40.01	2.41
tpcc_tps_multiplier			2.41

Overall Mean Multiple	1.52