Fix MySQL DELETE using CONCAT_WS preventing index usage #3675

Job	Run time
test-dbt-versions (1.7)	1m 40s
changes	6s
test-dbt-versions (1.6)	1m 42s
test-dbt-versions (1.5)	1m 37s
test-dbt-versions (1.3)	1m 40s
test-dbt-versions (1.10)	1m 51s
test-dbt-versions (1.4)	1m 25s
test-dbt-versions (1.8)	1m 46s
test-dbt-versions (1.9)	1m 44s
test-vscode	-1s
test-vscode-e2e	-1s
doc-tests	32s
cicd-tests-windows	10m 31s
migration-test	1m 24s
engine-tests-docker (mysql)	1m 47s
style-and-cicd-tests (3.11)	3m 15s
style-and-cicd-tests (3.13)	3m 31s
engine-tests-docker (clickhouse)	2m 35s
engine-tests-docker (spark)	5m 30s
engine-tests-docker (mssql)	1m 48s
style-and-cicd-tests (3.10)	2m 57s
style-and-cicd-tests (3.12)	3m 32s
engine-tests-docker (trino)	8m 54s
engine-tests-docker (risingwave)	2m 45s
engine-tests-docker (postgres)	2m 15s
style-and-cicd-tests (3.9)	2m 39s
engine-tests-docker (duckdb)	1m 34s
ui-style	0s
ui-test	0s
engine-tests-cloud	-1s
	1h 8m 57s

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