Allow to use non-primary columns in crossref tables #1535

Job	Run time
code-style-and-static-analysis	3m 27s
Test Suite (7.4, sqlite, 4-min)	1m 6s
Test Suite (7.4, sqlite, 4-max)	1m 0s
Test Suite (7.4, sqlite, 5-min)	58s
Test Suite (7.4, sqlite, 5-max)	59s
Test Suite (7.4, mysql, 4-min)	1m 11s
Test Suite (7.4, mysql, 4-max)	1m 26s
Test Suite (7.4, mysql, 5-min)	1m 19s
Test Suite (7.4, mysql, 5-max)	1m 36s
Test Suite (7.4, pgsql, 4-min)	1m 13s
Test Suite (7.4, pgsql, 4-max)	1m 31s
Test Suite (7.4, pgsql, 5-min)	1m 20s
Test Suite (7.4, pgsql, 5-max)	1m 16s
Test Suite (7.4, agnostic, 4-min)	50s
Test Suite (7.4, agnostic, 4-max)	29s
Test Suite (7.4, agnostic, 5-min)	40s
Test Suite (7.4, agnostic, 5-max)	32s
Test Suite (8.2, sqlite, 4-max)	51s
Test Suite (8.2, sqlite, 5-min)	53s
Test Suite (8.2, sqlite, 5-max)	48s
Test Suite (8.2, sqlite, 6-min)	50s
Test Suite (8.2, sqlite, 6-max)	59s
Test Suite (8.2, mysql, 4-max)	1m 23s
Test Suite (8.2, mysql, 5-min)	1m 27s
Test Suite (8.2, mysql, 5-max)	1m 38s
Test Suite (8.2, mysql, 6-min)	2m 9s
Test Suite (8.2, mysql, 6-max)	1m 25s
Test Suite (8.2, pgsql, 4-max)	1m 14s
Test Suite (8.2, pgsql, 5-min)	1m 21s
Test Suite (8.2, pgsql, 5-max)	1m 10s
Test Suite (8.2, pgsql, 6-min)	1m 57s
Test Suite (8.2, pgsql, 6-max)	1m 9s
Test Suite (8.2, agnostic, 4-max)	29s
Test Suite (8.2, agnostic, 5-min)	26s
Test Suite (8.2, agnostic, 5-max)	26s
Test Suite (8.2, agnostic, 6-min)	27s
Test Suite (8.2, agnostic, 6-max)	27s
	42m 22s

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