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Subquery Pushdown Optimization essentially results in elimination/rewrite of subqueries from certain Snaps—ELT Sort, ELT Unique, ELT Transform, ELT Coalesce, ELT Case Expression, ELT Conditional Functions, and ELT Math Functions—and a pushdown/rewrite of the subqueries from the rest of the ELT Snaps. For more information on which upstream Snaps can push down subqueries into a given Snap, refer to the respective Snap document. |
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