Add serialized plan complexity and hash to the continuation info in EXPLAIN #3541
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This commit adds a new column, 'SERIALIZED_PLAN_COMPLEXITY' to the 'PLAN_CONTINUATION' struct in the result from EXPLAIN which contains the complexity of the plan serialized within the continuation, if the continuation contains a compiled statement. This new column is populated for EXPLAINs on an 'EXECUTE CONTINUATION' statement and a regular SELECT statement that uses the `WITH CONTINUATION` clause.
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To match what happens when parsing struct columns.
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This PR adds two new columns,
PLAN_HASHandSERIALIZED_PLAN_COMPLEXITY, to thePLAN_CONTINUATIONstruct in the result from EXPLAIN which contain the plan hash stored in the continuation and the complexity of the plan serialized within the continuation (if the continuation contains a compiled statement )respectively .The new columns are populated for EXPLAINs on an
EXECUTE CONTINUATIONstatement and a regular SELECT statement that uses theWITH CONTINUATIONclause.