[no-release-notes] Fix SQLAlchemy pg_index expectation

[fulghum]

Updates the SQLAlchemy catalog expectation missed by #3150. A single-column index reports indnkeyatts = 1, matching the existing Doltgres catalog behavior and the exact query result from PostgreSQL 16.13.

[zachmu]

LGTM!

[github-actions]

	Main	PR
Total	42090	42090
Successful	19289	19289
Failures	22801	22801
Partial Successes1	5459	5459

	Main	PR
Successful	45.8280%	45.8280%
Failures	54.1720%	54.1720%

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. ↩

[itoqa]

Commit: 127d2bb: 2 test cases ran, 2 passed ✅.

Summary

Coverage focuses on database index behavior through direct catalog checks and application-level inspection, including index names, column order, uniqueness, and keeping primary-key information separate from secondary indexes. The exercised paths are successful creation and readback of both single-column and multi-column indexes, with no adversarial or user-interface behavior covered.

Safe to merge — the exercised index-management and inspection behavior passed without any PR-attributable regressions or unresolved failures. The run presents no merge-blocking application issues.

Tests run by Ito

Result	Severity	Type	Description
✅	—	Index	The catalog query returned exactly one row for t2_b_idx with one key column, non-unique status, non-primary status, and column b in position 2.
✅	—	Rev	SQLAlchemy created a table with one single-column index and one two-column index, then read both back with the correct names, column order, and uniqueness. The primary key stayed separate from the list of secondary indexes.

Tip

Reply with @itoqa to send us feedback on this test run.

[coffeegoddd]

@fulghum DOLT

read_tests	from_latency	to_latency	percent_change
covering_index_scan_postgres	2.43	2.43	0.0
groupby_scan_postgres	77.19	77.19	0.0
index_join_postgres	2.22	2.18	-1.8
index_join_scan_postgres	1.58	1.58	0.0
index_scan_postgres	467.3	475.79	1.82
oltp_point_select	0.37	0.36	-2.7
oltp_read_only	6.32	6.32	0.0
select_random_points	0.7	0.72	2.86
select_random_ranges	1.01	1.01	0.0
table_scan_postgres	467.3	484.44	3.67
types_table_scan_postgres	1170.65	1213.57	3.67

write_tests	from_latency	to_latency	percent_change
oltp_delete_insert_postgres	6.67	6.67	0.0
oltp_insert	3.36	3.3	-1.79
oltp_read_write	13.46	13.46	0.0
oltp_update_index	3.55	3.55	0.0
oltp_update_non_index	3.25	3.25	0.0
oltp_write_only	7.04	7.04	0.0
types_delete_insert_postgres	7.17	7.17	0.0