Optimize lazy loading in DatabaseMap #1490

Job	Run time
code-style-and-static-analysis	1m 18s
Test Suite (7.4, sqlite, 4-min)	1m 10s
Test Suite (7.4, sqlite, 4-max)	1m 8s
Test Suite (7.4, sqlite, 5-min)	1m 5s
Test Suite (7.4, sqlite, 5-max)	1m 4s
Test Suite (7.4, mysql, 4-min)	1m 27s
Test Suite (7.4, mysql, 4-max)	1m 43s
Test Suite (7.4, mysql, 5-min)	1m 25s
Test Suite (7.4, mysql, 5-max)	1m 28s
Test Suite (7.4, pgsql, 4-min)	1m 26s
Test Suite (7.4, pgsql, 4-max)	1m 45s
Test Suite (7.4, pgsql, 5-min)	1m 31s
Test Suite (7.4, pgsql, 5-max)	1m 27s
Test Suite (7.4, agnostic, 4-min)	49s
Test Suite (7.4, agnostic, 4-max)	48s
Test Suite (7.4, agnostic, 5-min)	47s
Test Suite (7.4, agnostic, 5-max)	46s
Test Suite (8.2, sqlite, 4-max)	55s
Test Suite (8.2, sqlite, 5-min)	56s
Test Suite (8.2, sqlite, 5-max)	55s
Test Suite (8.2, sqlite, 6-min)	1m 1s
Test Suite (8.2, sqlite, 6-max)	57s
Test Suite (8.2, mysql, 4-max)	1m 36s
Test Suite (8.2, mysql, 5-min)	2m 8s
Test Suite (8.2, mysql, 5-max)	1m 38s
Test Suite (8.2, mysql, 6-min)	2m 15s
Test Suite (8.2, mysql, 6-max)	1m 38s
Test Suite (8.2, pgsql, 4-max)	1m 24s
Test Suite (8.2, pgsql, 5-min)	1m 45s
Test Suite (8.2, pgsql, 5-max)	1m 38s
Test Suite (8.2, pgsql, 6-min)	1m 29s
Test Suite (8.2, pgsql, 6-max)	1m 39s
Test Suite (8.2, agnostic, 4-max)	37s
Test Suite (8.2, agnostic, 5-min)	36s
Test Suite (8.2, agnostic, 5-max)	40s
Test Suite (8.2, agnostic, 6-min)	39s
Test Suite (8.2, agnostic, 6-max)	41s
	46m 14s

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