https://docs.snowflake.com/en/sql-reference/sql/explain
"EXPLAIN compiles the SQL statement, but does not execute it, so EXPLAIN does not require a running warehouse.
Although EXPLAIN does not consume any compute credits, the compilation of the query does consume Cloud Service credits, just as other metadata operations do."
The EXPLAIN plan is the “logical” explain plan. It shows the operations that will be performed, and their logical relationship to each other. The actual execution order of the operations in the plan does not necessarily match the logical order shown by the plan.
Hence, it is not clear 100%. Let's say A., not B.
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