[memo] RequiredIndex interface #2238
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Some table nodes need to be executed as IndexScans with mandatory filters. The new interface makes this transparent to join planning.
zachmu
approved these changes
Jan 4, 2024
| // IndexRequired tables cannot be executed without index lookups on certain | ||
| // columns. Join planning uses this interface to maintain plan correctness | ||
| // for these nodes | ||
| type IndexRequired interface { |
sql/memo/rel_props.go
Outdated
| p.reqIdxCols = rel.Child.RelProps.reqIdxCols | ||
| case *Filter: | ||
| p.reqIdxCols = rel.Child.RelProps.reqIdxCols | ||
| default: |
| @@ -167,6 +170,26 @@ func (m *Memo) MemoizeLookupJoin(grp, left, right *ExprGroup, op plan.JoinType, | |||
| return grp | |||
| } | |||
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| func (m *Memo) MemoizeHashJoin(grp *ExprGroup, join *JoinBase, toExpr, fromExpr []sql.Expression) *ExprGroup { | |||
| if join.Right.RelProps.reqIdxCols.Len() > 0 { | |||
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sql/memo/memo.go
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| @@ -143,6 +143,9 @@ func (m *Memo) MemoizeInnerJoin(grp, left, right *ExprGroup, op plan.JoinType, f | |||
| } | |||
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| func (m *Memo) MemoizeLookupJoin(grp, left, right *ExprGroup, op plan.JoinType, filter []sql.Expression, lookup *IndexScan) *ExprGroup { | |||
| if left.RelProps.reqIdxCols.Union(right.RelProps.reqIdxCols).Difference(lookup.Index.set).Len() > 0 { | |||
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This was referenced Jan 5, 2024
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Some table nodes need to be executed as IndexScans with mandatory filters. The new interface makes this transparent to join planning.
re: dolthub/dolt#7256