Bug fix for multi-column indexes

[zachmu]

Fixes #1331

Also fixes an encoding bug: limited length varchar columns were always being encoded out of band.

Tests for the changes in dolthub/dolt#9061

Also fixes a bug in parsing --prof args

[github-actions]

	Main	PR
covering_index_scan_postgres	352.43/s	344.57/s	-2.3%
index_join_postgres	153.35/s	153.67/s	+0.2%
index_join_scan_postgres	182.43/s	184.86/s	+1.3%
index_scan_postgres	12.57/s	12.97/s	+3.1%
oltp_point_select	2501.14/s	2613.15/s	+4.4%
oltp_read_only	1731.23/s	${\color{red}726.69/s}$	${\color{red}-58.1\%}$
select_random_points	107.72/s	117.85/s	+9.4%
select_random_ranges	130.85/s	${\color{red}8.72/s}$	${\color{red}-93.4\%}$
table_scan_postgres	10.55/s	${\color{lightgreen}12.08/s}$	${\color{lightgreen}+14.5\%}$
types_table_scan_postgres	5.25/s	5.57/s	+6.0%

[github-actions]

	Main	PR
Total	42090	42090
Successful	15573	15582
Failures	26517	26508
Partial Successes1	5208	5208

	Main	PR
Successful	36.9993%	37.0207%
Failures	63.0007%	62.9793%

${\color{lightgreen}Progressions (9)}$

gin

QUERY: analyze t_gin_test_tbl;

join

QUERY: analyze tt3;

QUERY: analyze tt4;

partition_join

QUERY: analyze prtx1;

QUERY: analyze prtx2;

stats_ext

QUERY: ANALYZE tststats.priv_test_tbl;

subselect

QUERY: analyze exists_tbl;

vacuum

QUERY: ANALYZE pg_catalog.pg_class;

QUERY: ANALYZE pg_catalog.pg_authid;

Footnotes

1. These are tests that we're marking as Successful, however they do not match the expected output in some way. This is due to small differences, such as different wording on the error messages, or the column names being incorrect while the data itself is correct. ↩