Julian Hyde created OPTIQ-362:
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Summary: Make non-cumulative cost (NonCumulativeCost) a pluggable
form of metadata
Key: OPTIQ-362
URL: https://issues.apache.org/jira/browse/OPTIQ-362
Project: Optiq
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
Non-cumulative cost, the cost of a RelNode not including its children is also
known as RelNode.computeSelfCost(RelOptPlanner) and
BuiltInMetadata.NonCumulativeCost.
NonCumulativeCost should be included in the default metadata provider. (See how
BuiltInMetadata.Selectivity is included via RelMdSelectivity.SOURCE.)
Then people could add a different cost model for the core rel nodes (FilterRel,
JoinRel etc.)
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