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Learn to push evaluations out of the interpreter and into the compiled code like this:
SELECT ID, PERSON_ID,
ISNULL(ITEM_VERSION, 1) AS ITEM_VERSION,
ISNULL(ITEM_SUB_NAME, '') AS 'ITEM_SUB_NAME',
ISNULL(ITEM_SUB_SUB_NAME, '') AS 'ITEM_SUB_SUB_NAME',
ISNULL(ITEM_DATE,...