Fix MySQL DELETE using CONCAT_WS preventing index usage (#5756) #3962

Job	Run time
changes	7s
test-dbt-versions (1.3)	1m 48s
test-dbt-versions (1.4)	1m 39s
test-dbt-versions (1.8)	1m 25s
test-dbt-versions (1.6)	1m 38s
test-dbt-versions (1.7)	1m 43s
test-dbt-versions (1.5)	1m 34s
test-dbt-versions (1.9)	1m 31s
test-dbt-versions (1.10)	1m 37s
test-vscode	-1s
test-vscode-e2e	-7s
ui-test	1m 28s
migration-test	1m 23s
doc-tests	31s
cicd-tests-windows	9m 49s
style-and-cicd-tests (3.11)	23m 54s
style-and-cicd-tests (3.12)	24m 14s
style-and-cicd-tests (3.10)	21m 39s
style-and-cicd-tests (3.13)	21m 5s
style-and-cicd-tests (3.9)	24m 11s
engine-tests-docker (postgres)	2m 36s
engine-tests-docker (trino)	8m 21s
engine-tests-docker (mssql)	1m 42s
engine-tests-docker (spark)	5m 17s
engine-tests-docker (mysql)	1m 34s
engine-tests-docker (risingwave)	2m 24s
engine-tests-docker (clickhouse)	2m 54s
engine-tests-docker (duckdb)	1m 32s
engine-tests-docker (starrocks)	2m 40s
ui-style	0s
engine-tests-cloud (clickhouse-cloud)	10m 41s
engine-tests-cloud (gcp-postgres)	2m 19s
engine-tests-cloud (fabric)	5m 32s
engine-tests-cloud (athena)	19m 33s
engine-tests-cloud (databricks)	10m 33s
engine-tests-cloud (redshift)	8m 46s
engine-tests-cloud (snowflake)	12m 31s
engine-tests-cloud (bigquery)	19m 52s
	4h 19m 55s

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