I am trying to understand how the EXPLAIN PLAN statement generates the plan for a given query.
I have checked out the code from apache/github.
I am unable to find any document/link that atleast points me where do I start looking in the code or atleast what steps does the explain plan perform to arrive at the query plan.
Any pointers will be helpful.
Hi @Ramesh Prasad,
You may want to start looking at Apache Calcite. Calcite is the primary CBO behind Hive execution.
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