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The strange case of the underestimated Merge Join node
Brest, France, 12 January 2026 We recently encountered a strange optimizer behaviour, reported by one of our customers: Customer: “Hi Dalibo, we have a query that is very slow on the first execution after a batch process, and then very fast. We initially suspected a caching effect, but then we noticed that the execution plan was different.” Dalibo: “That’s a common issue.
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