prefix SQL keyword with double undescore #1929

Job	Run time
test (mysql, mysql, mysql://root:[email protected]/sqlpage)	3m 45s
test (postgres, postgres, postgres://root:[email protected]/sqlpage)	3m 38s
compile_and_lint	4m 59s
windows_test	6m 16s
test (odbc, postgres, Driver=PostgreSQL Unicode;Server=127.0.0.1;Port=5432;Database=sqlpage;UID=r...	5m 14s
test (mssql, mssql, mssql://root:[email protected]/sqlpage)	3m 40s
docker_build (linux/arm64)	5m 19s
docker_build (linux/amd64)	4m 59s
docker_build (linux/arm/v7)	5m 9s
docker_push	-1s
	42m 58s

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